feat(quiz): couples quiz with shareable watermarked results card

Replaces the notify-me quiz stub with a full loop: quiz sessions per
couple, answer-and-guess flow, dual-direction scoring, and a score-only
share card (no question or answer content) captured via ViewShot with
Sauci branding.

API: migration 0019 (quiz_questions, quiz_sessions, quiz_answers, 12
seeded questions), new quiz domain with session start / current /
answers / result routes, couple isolation, route + integration +
scoring unit tests.

Mobile: src/features/quiz feature (intro, per-question self+guess flow,
waiting-for-partner nudge, results with breakdown), quizStore with
sign-out clearing, QuizShareModal following SharePreviewModal, discovery
QuizTile, analytics events, and tests.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

apps/api/drizzle/0019_quiz.sql

@@ -0,0 +1,65 @@
+-- Couples quiz: a shareable "how well do you know each other?" loop. Each partner
+-- answers every question twice, once about themselves and once guessing their
+-- partner, and the session only scores once both partners have a complete set.
+CREATE TABLE IF NOT EXISTS "quiz_questions" (
+  "id" uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  "prompt_self" text NOT NULL UNIQUE,
+  "prompt_guess" text NOT NULL,
+  "options" text[] NOT NULL CHECK (array_length("options", 1) BETWEEN 2 AND 4),
+  "sort_order" integer NOT NULL DEFAULT 0,
+  "is_active" boolean NOT NULL DEFAULT true,
+  "created_at" timestamptz NOT NULL DEFAULT now()
+);
+--> statement-breakpoint
+CREATE TABLE IF NOT EXISTS "quiz_sessions" (
+  "id" uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  "couple_id" uuid NOT NULL REFERENCES "couples"("id") ON DELETE CASCADE,
+  "status" text NOT NULL DEFAULT 'active' CHECK ("status" IN ('active', 'completed')),
+  "question_ids" uuid[] NOT NULL,
+  "score_percent" integer,
+  "completed_at" timestamptz,
+  "created_at" timestamptz NOT NULL DEFAULT now()
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX IF NOT EXISTS "quiz_sessions_one_active_per_couple_idx"
+  ON "quiz_sessions" ("couple_id") WHERE "status" = 'active';
+--> statement-breakpoint
+CREATE INDEX IF NOT EXISTS "quiz_sessions_couple_id_created_at_idx"
+  ON "quiz_sessions" ("couple_id", "created_at" DESC);
+--> statement-breakpoint
+CREATE TABLE IF NOT EXISTS "quiz_answers" (
+  "session_id" uuid NOT NULL REFERENCES "quiz_sessions"("id") ON DELETE CASCADE,
+  "user_id" uuid NOT NULL,
+  "question_id" uuid NOT NULL,
+  "self_index" integer NOT NULL CHECK ("self_index" >= 0),
+  "guess_index" integer NOT NULL CHECK ("guess_index" >= 0),
+  "created_at" timestamptz NOT NULL DEFAULT now(),
+  PRIMARY KEY ("session_id", "user_id", "question_id")
+);
+--> statement-breakpoint
+INSERT INTO "quiz_questions" ("prompt_self", "prompt_guess", "options", "sort_order") VALUES
+  ('What is your idea of a perfect date night?', 'What is your partner''s idea of a perfect date night?',
+   ARRAY['Cosy night in', 'Fancy dinner out', 'Live music or a show', 'Something active or outdoorsy'], 10),
+  ('What comfort food do you crave the most?', 'What comfort food does your partner crave the most?',
+   ARRAY['Pizza', 'Ice cream', 'A home-cooked classic', 'Salty snacks'], 20),
+  ('How do you most like to receive love?', 'How does your partner most like to receive love?',
+   ARRAY['Words of affirmation', 'Quality time', 'Physical touch', 'Thoughtful gifts'], 30),
+  ('What is your biggest pet peeve at home?', 'What is your partner''s biggest pet peeve at home?',
+   ARRAY['Dishes left in the sink', 'Clothes on the floor', 'Being interrupted', 'Loud noises while resting'], 40),
+  ('If you could go anywhere on a dream holiday, where would it be?', 'If your partner could go anywhere on a dream holiday, where would it be?',
+   ARRAY['A beach escape', 'A big city adventure', 'A mountain retreat', 'A road trip somewhere new'], 50),
+  ('What movie genre do you reach for most?', 'What movie genre does your partner reach for most?',
+   ARRAY['Comedy', 'Romance', 'Action or thriller', 'Documentary'], 60),
+  ('Are you more of a morning person or a night person?', 'Is your partner more of a morning person or a night person?',
+   ARRAY['Morning person', 'Night person', 'A bit of both', 'Neither, honestly'], 70),
+  ('What hidden talent are you secretly proud of?', 'What hidden talent is your partner secretly proud of?',
+   ARRAY['Cooking or baking', 'Singing or dancing', 'A sport or game', 'Art or a craft'], 80),
+  ('What helps you relieve stress the most?', 'What helps your partner relieve stress the most?',
+   ARRAY['A quiet walk', 'Talking it out', 'Exercise', 'Watching something and switching off'], 90),
+  ('If you splurged on one thing, what would it be?', 'If your partner splurged on one thing, what would it be?',
+   ARRAY['New clothes', 'A gadget', 'A trip', 'A nice meal out'], 100),
+  ('What is your go-to karaoke song vibe?', 'What is your partner''s go-to karaoke song vibe?',
+   ARRAY['A power ballad', 'An upbeat pop anthem', 'An old classic', 'I would never do karaoke'], 110),
+  ('If you had one superpower, which would you pick?', 'If your partner had one superpower, which would they pick?',
+   ARRAY['Flight', 'Invisibility', 'Reading minds', 'Time travel'], 120)
+ON CONFLICT ("prompt_self") DO NOTHING;

apps/api/drizzle/meta/_journal.json

@@ -134,6 +134,13 @@
       "when": 1788081480000,
       "tag": "0018_cutover_source_parity",
       "breakpoints": true
+    },
+    {
+      "idx": 19,
+      "version": "7",
+      "when": 1788168000000,
+      "tag": "0019_quiz",
+      "breakpoints": true
     }
   ]
 }

apps/api/src/app.ts

@@ -15,6 +15,8 @@ import type { ChatRepository } from './domains/chat/repository.js';
 import { registerChatRoutes } from './domains/chat/routes.js';
 import type { DaresRepository } from './domains/dares/repository.js';
 import { registerDareRoutes } from './domains/dares/routes.js';
+import type { QuizRepository } from './domains/quiz/repository.js';
+import { registerQuizRoutes } from './domains/quiz/routes.js';
 import { registerCoupleRoutes } from './domains/couples/routes.js';
 import type { CoupleService } from './domains/couples/service.js';
 import type { PacksRepository } from './domains/packs/repository.js';
@@ -39,6 +41,7 @@ export interface AppDependencies {
   answersRepository?: AnswersRepository;
   chatRepository?: ChatRepository;
   daresRepository?: DaresRepository;
+  quizRepository?: QuizRepository;
   profileSettingsRepository?: ProfileSettingsRepository;
   accountOperationsService?: AccountOperationsService;
   mediaRepository?: MediaRepository;
@@ -126,6 +129,7 @@ export function createApp(deps: AppDependencies): Hono<{ Variables: Variables }>
   if (deps.answersRepository) registerAnswerRoutes(app, deps.answersRepository);
   if (deps.chatRepository) registerChatRoutes(app, deps.chatRepository);
   if (deps.daresRepository) registerDareRoutes(app, deps.daresRepository);
+  if (deps.quizRepository) registerQuizRoutes(app, deps.quizRepository);
   if (deps.profileSettingsRepository) registerProfileSettingsRoutes(app, deps.profileSettingsRepository);
   if (deps.accountOperationsService) registerAccountOperationRoutes(app, deps.accountOperationsService);
   if (deps.mediaRepository && deps.mediaStorage) registerMediaRoutes(app, deps.mediaRepository, deps.mediaStorage);

apps/api/src/db/all-schema.ts

@@ -4,3 +4,4 @@ export * from '../domains/packs/schema.js';
 export * from '../domains/answers/schema.js';
 export * from '../domains/chat/schema.js';
 export * from '../domains/app-data/schema.js';
+export * from '../domains/quiz/schema.js';

apps/api/src/domains/quiz/repository.ts

@@ -0,0 +1,376 @@
+import { Pool, type PoolClient, type QueryResultRow } from 'pg';
+import { closeResolvedPool, resolvePool, type DatabaseConnection } from '../../db/pool.js';
+import { computeQuizScore, type QuizAnswerPair } from './service.js';
+import {
+  QuizError,
+  type QuizAnswerInput,
+  type QuizQuestionSummary,
+  type QuizResultPayload,
+  type QuizSessionPayload,
+  type QuizSessionStatus,
+} from './types.js';
+
+interface QuizQuestionRow extends QueryResultRow {
+  id: string;
+  prompt_self: string;
+  prompt_guess: string;
+  options: string[];
+}
+
+interface QuizSessionRow extends QueryResultRow {
+  id: string;
+  couple_id: string;
+  status: QuizSessionStatus;
+  question_ids: string[];
+  score_percent: number | null;
+  completed_at: Date | null;
+  created_at: Date;
+}
+
+interface QuizAnswerRow extends QueryResultRow {
+  user_id: string;
+  question_id: string;
+  self_index: number;
+  guess_index: number;
+}
+
+export interface QuizRepository {
+  startSession(userId: string): Promise<{ session: QuizSessionPayload; created: boolean }>;
+  currentSession(userId: string): Promise<QuizSessionPayload | null>;
+  submitAnswers(userId: string, sessionId: string, answers: QuizAnswerInput[]): Promise<QuizSessionPayload>;
+  result(userId: string, sessionId: string): Promise<QuizResultPayload>;
+  close(): Promise<void>;
+}
+
+const QUESTIONS_PER_SESSION = 10;
+
+async function transaction<T>(pool: Pool, work: (client: PoolClient) => Promise<T>): Promise<T> {
+  const client = await pool.connect();
+  try {
+    await client.query('begin');
+    const result = await work(client);
+    await client.query('commit');
+    return result;
+  } catch (error) {
+    await client.query('rollback');
+    throw error;
+  } finally {
+    client.release();
+  }
+}
+
+function orderByIds<T extends { id: string }>(rows: T[], ids: string[]): T[] {
+  const byId = new Map(rows.map((row) => [row.id, row]));
+  return ids.map((id) => byId.get(id)).filter((row): row is T => row !== undefined);
+}
+
+export class PostgresQuizRepository implements QuizRepository {
+  private readonly pool: Pool;
+  private readonly ownsPool: boolean;
+
+  constructor(connection: DatabaseConnection) {
+    const resolved = resolvePool(connection);
+    this.pool = resolved.pool;
+    this.ownsPool = resolved.owned;
+  }
+
+  private async coupleOf(client: Pool | PoolClient, userId: string): Promise<string | null> {
+    const result = await client.query<{ couple_id: string | null }>(
+      'select couple_id from profiles where id = $1',
+      [userId],
+    );
+    return result.rows[0]?.couple_id ?? null;
+  }
+
+  private async partnerOf(client: Pool | PoolClient, coupleId: string, userId: string): Promise<string | null> {
+    const result = await client.query<{ id: string }>(
+      'select id from profiles where couple_id = $1 and id <> $2 order by id asc limit 1',
+      [coupleId, userId],
+    );
+    return result.rows[0]?.id ?? null;
+  }
+
+  private async questionsFor(client: Pool | PoolClient, questionIds: string[]): Promise<QuizQuestionRow[]> {
+    const result = await client.query<QuizQuestionRow>(
+      'select id, prompt_self, prompt_guess, options from quiz_questions where id = any($1::uuid[])',
+      [questionIds],
+    );
+    return orderByIds(result.rows, questionIds);
+  }
+
+  private async buildPayload(
+    client: Pool | PoolClient,
+    session: QuizSessionRow,
+    userId: string,
+  ): Promise<QuizSessionPayload> {
+    const questions = await this.questionsFor(client, session.question_ids);
+    const [myAnswers, counts] = await Promise.all([
+      client.query<QuizAnswerRow>(
+        'select question_id, self_index, guess_index from quiz_answers where session_id = $1 and user_id = $2',
+        [session.id, userId],
+      ),
+      client.query<{ user_id: string; count: string }>(
+        'select user_id, count(*)::text as count from quiz_answers where session_id = $1 group by user_id',
+        [session.id],
+      ),
+    ]);
+
+    const coupleId = session.couple_id;
+    const partnerId = await this.partnerOf(client, coupleId, userId);
+    const answerCounts = new Map(counts.rows.map((row) => [row.user_id, Number(row.count)]));
+    const questionCount = session.question_ids.length;
+
+    const answersByQuestion = new Map(myAnswers.rows.map((row) => [row.question_id, row]));
+    const orderedAnswers: QuizAnswerInput[] = session.question_ids
+      .map((questionId) => answersByQuestion.get(questionId))
+      .filter((row): row is QuizAnswerRow => row !== undefined)
+      .map((row) => ({ question_id: row.question_id, self_index: row.self_index, guess_index: row.guess_index }));
+
+    const questionSummaries: QuizQuestionSummary[] = questions.map((row) => ({
+      id: row.id,
+      prompt_self: row.prompt_self,
+      prompt_guess: row.prompt_guess,
+      options: row.options,
+    }));
+
+    return {
+      id: session.id,
+      status: session.status,
+      created_at: session.created_at.toISOString(),
+      completed_at: session.completed_at?.toISOString() ?? null,
+      score_percent: session.score_percent,
+      questions: questionSummaries,
+      my_answers: orderedAnswers,
+      partner_completed: partnerId ? (answerCounts.get(partnerId) ?? 0) === questionCount : false,
+      i_completed: (answerCounts.get(userId) ?? 0) === questionCount,
+    };
+  }
+
+  async startSession(userId: string): Promise<{ session: QuizSessionPayload; created: boolean }> {
+    return transaction(this.pool, async (client) => {
+      const coupleId = await this.coupleOf(client, userId);
+      if (!coupleId) throw new QuizError('no_couple', 'Join a couple before starting a quiz', 409);
+
+      const members = await client.query<{ count: string }>(
+        'select count(*)::text as count from profiles where couple_id = $1',
+        [coupleId],
+      );
+      if (Number(members.rows[0]?.count ?? 0) < 2) {
+        throw new QuizError('partner_required', 'Both partners must be paired to start a quiz', 409);
+      }
+
+      const existing = await client.query<QuizSessionRow>(
+        `select * from quiz_sessions where couple_id = $1 and status = 'active' order by created_at desc limit 1`,
+        [coupleId],
+      );
+      if (existing.rows[0]) {
+        return { session: await this.buildPayload(client, existing.rows[0], userId), created: false };
+      }
+
+      const questions = await client.query<{ id: string }>(
+        'select id from quiz_questions where is_active = true order by sort_order, id limit $1',
+        [QUESTIONS_PER_SESSION],
+      );
+      const questionIds = questions.rows.map((row) => row.id);
+
+      // The partial unique index (one active session per couple) is the source of
+      // truth for the race between two simultaneous starts; ON CONFLICT DO NOTHING
+      // lets the loser fall through to reading the winner's row instead of erroring.
+      const inserted = await client.query<QuizSessionRow>(
+        `insert into quiz_sessions (couple_id, question_ids)
+         values ($1, $2::uuid[])
+         on conflict (couple_id) where status = 'active' do nothing
+         returning *`,
+        [coupleId, questionIds],
+      );
+
+      let sessionRow = inserted.rows[0];
+      let created = true;
+      if (!sessionRow) {
+        created = false;
+        const raced = await client.query<QuizSessionRow>(
+          `select * from quiz_sessions where couple_id = $1 and status = 'active' order by created_at desc limit 1`,
+          [coupleId],
+        );
+        sessionRow = raced.rows[0]!;
+      }
+
+      return { session: await this.buildPayload(client, sessionRow, userId), created };
+    });
+  }
+
+  async currentSession(userId: string): Promise<QuizSessionPayload | null> {
+    const coupleId = await this.coupleOf(this.pool, userId);
+    if (!coupleId) return null;
+    const result = await this.pool.query<QuizSessionRow>(
+      'select * from quiz_sessions where couple_id = $1 order by created_at desc limit 1',
+      [coupleId],
+    );
+    const row = result.rows[0];
+    if (!row) return null;
+    return this.buildPayload(this.pool, row, userId);
+  }
+
+  async submitAnswers(userId: string, sessionId: string, answers: QuizAnswerInput[]): Promise<QuizSessionPayload> {
+    return transaction(this.pool, async (client) => {
+      const sessionResult = await client.query<QuizSessionRow>(
+        'select * from quiz_sessions where id = $1 for update',
+        [sessionId],
+      );
+      const session = sessionResult.rows[0];
+      const coupleId = await this.coupleOf(client, userId);
+      if (!session || !coupleId || session.couple_id !== coupleId) {
+        throw new QuizError('session_not_found', 'Quiz session not found', 404);
+      }
+      if (session.status !== 'active') {
+        throw new QuizError('session_completed', 'This quiz session has already finished', 409);
+      }
+
+      const questionIds = new Set(session.question_ids);
+      const answeredIds = new Set(answers.map((answer) => answer.question_id));
+      if (answeredIds.size !== answers.length || answeredIds.size !== questionIds.size) {
+        throw new QuizError('invalid_answers', 'Answers must cover every question in the session exactly once', 400);
+      }
+      for (const id of answeredIds) {
+        if (!questionIds.has(id)) {
+          throw new QuizError('invalid_answers', 'Answers must cover every question in the session exactly once', 400);
+        }
+      }
+
+      const questions = await this.questionsFor(client, session.question_ids);
+      const optionsByQuestion = new Map(questions.map((question) => [question.id, question.options]));
+      for (const answer of answers) {
+        const options = optionsByQuestion.get(answer.question_id);
+        if (!options) {
+          throw new QuizError('invalid_answers', 'Answers must cover every question in the session exactly once', 400);
+        }
+        if (
+          answer.self_index < 0 || answer.self_index >= options.length ||
+          answer.guess_index < 0 || answer.guess_index >= options.length
+        ) {
+          throw new QuizError('invalid_answers', 'Answer indexes must be within the question options', 400);
+        }
+      }
+
+      for (const answer of answers) {
+        await client.query(
+          `insert into quiz_answers (session_id, user_id, question_id, self_index, guess_index)
+           values ($1, $2, $3, $4, $5)
+           on conflict (session_id, user_id, question_id)
+           do update set self_index = excluded.self_index, guess_index = excluded.guess_index`,
+          [sessionId, userId, answer.question_id, answer.self_index, answer.guess_index],
+        );
+      }
+
+      const partnerId = await this.partnerOf(client, coupleId, userId);
+      let updatedSession = session;
+      if (partnerId) {
+        const counts = await client.query<{ user_id: string; count: string }>(
+          'select user_id, count(*)::text as count from quiz_answers where session_id = $1 group by user_id',
+          [sessionId],
+        );
+        const answerCounts = new Map(counts.rows.map((row) => [row.user_id, Number(row.count)]));
+        const questionCount = session.question_ids.length;
+        const bothComplete =
+          (answerCounts.get(userId) ?? 0) === questionCount && (answerCounts.get(partnerId) ?? 0) === questionCount;
+
+        if (bothComplete) {
+          const allAnswers = await client.query<QuizAnswerRow>(
+            'select user_id, question_id, self_index, guess_index from quiz_answers where session_id = $1',
+            [sessionId],
+          );
+          const byUser = new Map<string, Map<string, QuizAnswerRow>>();
+          for (const row of allAnswers.rows) {
+            if (!byUser.has(row.user_id)) byUser.set(row.user_id, new Map());
+            byUser.get(row.user_id)!.set(row.question_id, row);
+          }
+          const mine = byUser.get(userId)!;
+          const theirs = byUser.get(partnerId)!;
+          const pairs: QuizAnswerPair[] = session.question_ids.map((questionId) => ({
+            questionId,
+            aSelfIndex: mine.get(questionId)!.self_index,
+            aGuessIndex: mine.get(questionId)!.guess_index,
+            bSelfIndex: theirs.get(questionId)!.self_index,
+            bGuessIndex: theirs.get(questionId)!.guess_index,
+          }));
+          const { scorePercent } = computeQuizScore(pairs);
+
+          const completed = await client.query<QuizSessionRow>(
+            `update quiz_sessions set status = 'completed', score_percent = $2, completed_at = now()
+             where id = $1
+             returning *`,
+            [sessionId, scorePercent],
+          );
+          updatedSession = completed.rows[0]!;
+        }
+      }
+
+      return this.buildPayload(client, updatedSession, userId);
+    });
+  }
+
+  async result(userId: string, sessionId: string): Promise<QuizResultPayload> {
+    const sessionResult = await this.pool.query<QuizSessionRow>(
+      'select * from quiz_sessions where id = $1',
+      [sessionId],
+    );
+    const session = sessionResult.rows[0];
+    const coupleId = await this.coupleOf(this.pool, userId);
+    if (!session || !coupleId || session.couple_id !== coupleId) {
+      throw new QuizError('session_not_found', 'Quiz session not found', 404);
+    }
+    if (session.status !== 'completed') {
+      throw new QuizError('session_not_completed', 'This quiz session has not finished yet', 409);
+    }
+
+    const partnerId = await this.partnerOf(this.pool, coupleId, userId);
+    if (!partnerId) throw new QuizError('session_not_found', 'Quiz session not found', 404);
+
+    const [questions, allAnswers] = await Promise.all([
+      this.questionsFor(this.pool, session.question_ids),
+      this.pool.query<QuizAnswerRow>(
+        'select user_id, question_id, self_index, guess_index from quiz_answers where session_id = $1',
+        [sessionId],
+      ),
+    ]);
+
+    const byUser = new Map<string, Map<string, QuizAnswerRow>>();
+    for (const row of allAnswers.rows) {
+      if (!byUser.has(row.user_id)) byUser.set(row.user_id, new Map());
+      byUser.get(row.user_id)!.set(row.question_id, row);
+    }
+    const mine = byUser.get(userId) ?? new Map<string, QuizAnswerRow>();
+    const theirs = byUser.get(partnerId) ?? new Map<string, QuizAnswerRow>();
+
+    const questionsPayload = questions.map((question) => {
+      const my = mine.get(question.id);
+      const partner = theirs.get(question.id);
+      const mySelf = my?.self_index ?? 0;
+      const myGuess = my?.guess_index ?? 0;
+      const partnerSelf = partner?.self_index ?? 0;
+      const partnerGuess = partner?.guess_index ?? 0;
+      return {
+        question_id: question.id,
+        prompt_self: question.prompt_self,
+        prompt_guess: question.prompt_guess,
+        options: question.options,
+        my_self_index: mySelf,
+        my_guess_index: myGuess,
+        partner_self_index: partnerSelf,
+        partner_guess_index: partnerGuess,
+        i_guessed_right: myGuess === partnerSelf,
+        partner_guessed_right: partnerGuess === mySelf,
+      };
+    });
+
+    return {
+      score_percent: session.score_percent ?? 0,
+      completed_at: session.completed_at?.toISOString() ?? null,
+      questions: questionsPayload,
+    };
+  }
+
+  async close(): Promise<void> {
+    await closeResolvedPool(this.pool, this.ownsPool);
+  }
+}

apps/api/src/domains/quiz/routes.ts

@@ -0,0 +1,66 @@
+import type { ApiErrorResponse } from '@sauci/shared';
+import type { Hono } from 'hono';
+import { z } from 'zod';
+import type { AuthIdentity } from '../../auth.js';
+import { QuizError, type QuizAnswerInput } from './types.js';
+import type { QuizRepository } from './repository.js';
+
+type QuizApp = Hono<{ Variables: { identity: AuthIdentity } }>;
+
+const id = z.string().uuid();
+
+const answerEntry = z
+  .object({
+    question_id: id,
+    self_index: z.number().int().min(0),
+    guess_index: z.number().int().min(0),
+  })
+  .strict();
+
+const submitBody = z.object({ answers: z.array(answerEntry).min(1) }).strict();
+
+function error(code: string, message: string): ApiErrorResponse {
+  return { error: { code, message } };
+}
+
+async function result<T>(operation: () => Promise<T>) {
+  try {
+    return { ok: true as const, value: await operation() };
+  } catch (cause) {
+    if (cause instanceof QuizError) return { ok: false as const, cause };
+    throw cause;
+  }
+}
+
+export function registerQuizRoutes(app: QuizApp, repository: QuizRepository): void {
+  app.post('/v1/quiz/sessions', async (c) => {
+    const response = await result(() => repository.startSession(c.get('identity').id));
+    if (!response.ok) return c.json(error(response.cause.code, response.cause.message), response.cause.status);
+    return c.json({ session: response.value.session }, response.value.created ? 201 : 200);
+  });
+
+  app.get('/v1/quiz/sessions/current', async (c) => {
+    const response = await result(() => repository.currentSession(c.get('identity').id));
+    if (!response.ok) return c.json(error(response.cause.code, response.cause.message), response.cause.status);
+    return c.json({ session: response.value });
+  });
+
+  app.post('/v1/quiz/sessions/:sessionId/answers', async (c) => {
+    const sessionId = id.safeParse(c.req.param('sessionId'));
+    if (!sessionId.success) return c.json(error('session_not_found', 'Quiz session not found'), 404);
+    const body = submitBody.safeParse(await c.req.json().catch(() => ({})));
+    if (!body.success) return c.json(error('invalid_answers', 'Provide the full set of question answers'), 400);
+    const answers: QuizAnswerInput[] = body.data.answers;
+    const response = await result(() => repository.submitAnswers(c.get('identity').id, sessionId.data, answers));
+    if (!response.ok) return c.json(error(response.cause.code, response.cause.message), response.cause.status);
+    return c.json({ session: response.value });
+  });
+
+  app.get('/v1/quiz/sessions/:sessionId/result', async (c) => {
+    const sessionId = id.safeParse(c.req.param('sessionId'));
+    if (!sessionId.success) return c.json(error('session_not_found', 'Quiz session not found'), 404);
+    const response = await result(() => repository.result(c.get('identity').id, sessionId.data));
+    if (!response.ok) return c.json(error(response.cause.code, response.cause.message), response.cause.status);
+    return c.json(response.value);
+  });
+}

apps/api/src/domains/quiz/schema.ts

@@ -0,0 +1,51 @@
+import { boolean, check, index, integer, pgTable, primaryKey, text, timestamp, uniqueIndex, uuid } from 'drizzle-orm/pg-core';
+import { sql } from 'drizzle-orm';
+import { couples } from '../couples/schema.js';
+
+/**
+ * Couples quiz catalogue. `promptSelf` and `promptGuess` are two phrasings of the
+ * same question so a session can ask each partner about themselves and about the
+ * other without a second row.
+ */
+export const quizQuestions = pgTable('quiz_questions', {
+  id: uuid('id').primaryKey().defaultRandom(),
+  promptSelf: text('prompt_self').notNull().unique(),
+  promptGuess: text('prompt_guess').notNull(),
+  options: text('options').array().notNull(),
+  sortOrder: integer('sort_order').notNull().default(0),
+  isActive: boolean('is_active').notNull().default(true),
+  createdAt: timestamp('created_at', { withTimezone: true }).notNull().defaultNow(),
+}, (table) => [
+  check('quiz_questions_options_length_check', sql`array_length(${table.options}, 1) between 2 and 4`),
+]);
+
+export const quizSessions = pgTable('quiz_sessions', {
+  id: uuid('id').primaryKey().defaultRandom(),
+  coupleId: uuid('couple_id').notNull().references(() => couples.id, { onDelete: 'cascade' }),
+  status: text('status').notNull().default('active'),
+  questionIds: uuid('question_ids').array().notNull(),
+  scorePercent: integer('score_percent'),
+  completedAt: timestamp('completed_at', { withTimezone: true }),
+  createdAt: timestamp('created_at', { withTimezone: true }).notNull().defaultNow(),
+}, (table) => [
+  index('quiz_sessions_couple_id_created_at_idx').on(table.coupleId, table.createdAt),
+  uniqueIndex('quiz_sessions_one_active_per_couple_idx').on(table.coupleId).where(sql`${table.status} = 'active'`),
+  check('quiz_sessions_status_check', sql`${table.status} in ('active','completed')`),
+]);
+
+export const quizAnswers = pgTable('quiz_answers', {
+  sessionId: uuid('session_id').notNull().references(() => quizSessions.id, { onDelete: 'cascade' }),
+  userId: uuid('user_id').notNull(),
+  questionId: uuid('question_id').notNull(),
+  selfIndex: integer('self_index').notNull(),
+  guessIndex: integer('guess_index').notNull(),
+  createdAt: timestamp('created_at', { withTimezone: true }).notNull().defaultNow(),
+}, (table) => [
+  primaryKey({ columns: [table.sessionId, table.userId, table.questionId] }),
+  check('quiz_answers_self_index_check', sql`${table.selfIndex} >= 0`),
+  check('quiz_answers_guess_index_check', sql`${table.guessIndex} >= 0`),
+]);
+
+export type QuizQuestionRow = typeof quizQuestions.$inferSelect;
+export type QuizSessionRow = typeof quizSessions.$inferSelect;
+export type QuizAnswerRow = typeof quizAnswers.$inferSelect;

apps/api/src/domains/quiz/service.ts

@@ -0,0 +1,41 @@
+/**
+ * One partner's guess of the other's self-answer, for a single question. Scoring
+ * always runs both directions: A guessing B and B guessing A each count separately,
+ * so a couple who only ever gets half the guesses right lands at 50%, not 100%.
+ */
+export interface QuizAnswerPair {
+  questionId: string;
+  aSelfIndex: number;
+  aGuessIndex: number;
+  bSelfIndex: number;
+  bGuessIndex: number;
+}
+
+export interface QuizScoreQuestionResult extends QuizAnswerPair {
+  aGuessedRight: boolean;
+  bGuessedRight: boolean;
+}
+
+export interface QuizScoreResult {
+  scorePercent: number;
+  perQuestion: QuizScoreQuestionResult[];
+}
+
+/**
+ * Pure scoring function for a completed quiz session. Each question contributes
+ * up to two hits (partner A's guess about B, and B's guess about A), so the
+ * denominator is twice the question count.
+ */
+export function computeQuizScore(pairs: QuizAnswerPair[]): QuizScoreResult {
+  const perQuestion = pairs.map((pair) => ({
+    ...pair,
+    aGuessedRight: pair.aGuessIndex === pair.bSelfIndex,
+    bGuessedRight: pair.bGuessIndex === pair.aSelfIndex,
+  }));
+  const hits = perQuestion.reduce(
+    (sum, question) => sum + (question.aGuessedRight ? 1 : 0) + (question.bGuessedRight ? 1 : 0),
+    0,
+  );
+  const scorePercent = pairs.length === 0 ? 0 : Math.round((100 * hits) / (2 * pairs.length));
+  return { scorePercent, perQuestion };
+}

apps/api/src/domains/quiz/types.ts

@@ -0,0 +1,64 @@
+export type QuizSessionStatus = 'active' | 'completed';
+
+export type QuizErrorCode =
+  | 'no_couple'
+  | 'partner_required'
+  | 'session_not_found'
+  | 'session_completed'
+  | 'invalid_answers'
+  | 'session_not_completed';
+
+export class QuizError extends Error {
+  constructor(
+    readonly code: QuizErrorCode,
+    message: string,
+    readonly status: 400 | 404 | 409,
+  ) {
+    super(message);
+    this.name = 'QuizError';
+  }
+}
+
+export interface QuizAnswerInput {
+  question_id: string;
+  self_index: number;
+  guess_index: number;
+}
+
+export interface QuizQuestionSummary {
+  id: string;
+  prompt_self: string;
+  prompt_guess: string;
+  options: string[];
+}
+
+export interface QuizSessionPayload {
+  id: string;
+  status: QuizSessionStatus;
+  created_at: string;
+  completed_at: string | null;
+  score_percent: number | null;
+  questions: QuizQuestionSummary[];
+  my_answers: QuizAnswerInput[];
+  partner_completed: boolean;
+  i_completed: boolean;
+}
+
+export interface QuizResultQuestion {
+  question_id: string;
+  prompt_self: string;
+  prompt_guess: string;
+  options: string[];
+  my_self_index: number;
+  my_guess_index: number;
+  partner_self_index: number;
+  partner_guess_index: number;
+  i_guessed_right: boolean;
+  partner_guessed_right: boolean;
+}
+
+export interface QuizResultPayload {
+  score_percent: number;
+  completed_at: string | null;
+  questions: QuizResultQuestion[];
+}

apps/api/src/index.ts

@@ -20,6 +20,7 @@ import {
 import { PostgresAnswersRepository } from './domains/answers/repository.js';
 import { PostgresChatRepository } from './domains/chat/repository.js';
 import { PostgresDaresRepository } from './domains/dares/repository.js';
+import { PostgresQuizRepository } from './domains/quiz/repository.js';
 import { PostgresCoupleRepository } from './domains/couples/repository.js';
 import { CoupleService } from './domains/couples/service.js';
 import { PostgresPacksRepository } from './domains/packs/repository.js';
@@ -38,6 +39,7 @@ const packsRepository = new PostgresPacksRepository(pool);
 const answersRepository = new PostgresAnswersRepository(pool);
 const chatRepository = new PostgresChatRepository(pool);
 const daresRepository = new PostgresDaresRepository(pool);
+const quizRepository = new PostgresQuizRepository(pool);
 const profileSettingsRepository = new PostgresProfileSettingsRepository(pool);
 const accountOperationsRepository = new PostgresAccountOperationsRepository(pool);
 const accountOperationsService = new AccountOperationsService(
@@ -68,6 +70,7 @@ const app = createApp({
   answersRepository,
   chatRepository,
   daresRepository,
+  quizRepository,
   profileSettingsRepository,
   accountOperationsService,
   mediaRepository,

apps/api/test/quiz.integration.test.ts

@@ -0,0 +1,209 @@
+import { randomUUID } from 'node:crypto';
+import { readdir, readFile } from 'node:fs/promises';
+import { Pool } from 'pg';
+import { afterAll, beforeAll, beforeEach, describe, expect, it } from 'vitest';
+import { PostgresQuizRepository } from '../src/domains/quiz/repository.js';
+
+const url = process.env.DATABASE_URL;
+const local = url ? ['127.0.0.1', 'localhost', '::1'].includes(new URL(url).hostname) : false;
+if (url && !local) throw new Error('Quiz integration tests only permit localhost');
+
+describe.skipIf(!url || !local)('quiz + PostgreSQL', () => {
+  const admin = new Pool({ connectionString: url });
+  const schema = `quiz_${randomUUID().replaceAll('-', '')}`;
+  let pool: Pool;
+  let repo: PostgresQuizRepository;
+
+  const userA = '11111111-1111-4111-8111-111111111111';
+  const userB = '22222222-2222-4222-8222-222222222222';
+  const soloUser = '33333333-3333-4333-8333-333333333333';
+  const outsider = '44444444-4444-4444-8444-444444444444';
+  const couple = '55555555-5555-4555-8555-555555555555';
+  const soloCouple = '66666666-6666-4666-8666-666666666666';
+  const otherCouple = '77777777-7777-4777-8777-777777777777';
+
+  beforeAll(async () => {
+    await admin.query(`create schema "${schema}"`);
+    const isolated = new URL(url!);
+    isolated.searchParams.set('options', `-c search_path=${schema}`);
+    pool = new Pool({ connectionString: isolated.toString() });
+    repo = new PostgresQuizRepository(isolated.toString());
+
+    const dir = new URL('../drizzle/', import.meta.url);
+    const files = (await readdir(dir)).filter((name) => name.endsWith('.sql')).sort();
+    for (const name of files) {
+      const sql = await readFile(new URL(name, dir), 'utf8');
+      for (const statement of sql.split('--> statement-breakpoint')) {
+        if (statement.trim()) await pool.query(statement);
+      }
+    }
+
+    await pool.query(
+      'insert into couples(id,invite_code) values($1,$2),($3,$4),($5,$6)',
+      [couple, 'QUIZAAA1', soloCouple, 'QUIZAAA2', otherCouple, 'QUIZAAA3'],
+    );
+    await pool.query(
+      `insert into profiles(id,couple_id) values
+        ($1,$5),($2,$5),($3,$6),($4,$7)`,
+      [userA, userB, soloUser, outsider, couple, soloCouple, otherCouple],
+    );
+  });
+
+  beforeEach(async () => {
+    await pool.query('delete from quiz_answers');
+    await pool.query('delete from quiz_sessions');
+  });
+
+  afterAll(async () => {
+    await repo.close();
+    await pool.end();
+    await admin.query(`drop schema "${schema}" cascade`);
+    await admin.end();
+  });
+
+  it('refuses to start a quiz without a couple or without a partner', async () => {
+    await expect(repo.startSession(randomUUID())).rejects.toMatchObject({ code: 'no_couple' });
+    await expect(repo.startSession(soloUser)).rejects.toMatchObject({ code: 'partner_required' });
+  });
+
+  it('starts a session with ten active questions and returns it idempotently', async () => {
+    const first = await repo.startSession(userA);
+    expect(first.created).toBe(true);
+    expect(first.session.status).toBe('active');
+    expect(first.session.questions).toHaveLength(10);
+    expect(first.session.score_percent).toBeNull();
+    expect(first.session.my_answers).toEqual([]);
+    expect(first.session.i_completed).toBe(false);
+    expect(first.session.partner_completed).toBe(false);
+
+    const second = await repo.startSession(userA);
+    expect(second.created).toBe(false);
+    expect(second.session.id).toBe(first.session.id);
+
+    // The partner starting also resolves to the same active session.
+    const partnerView = await repo.startSession(userB);
+    expect(partnerView.created).toBe(false);
+    expect(partnerView.session.id).toBe(first.session.id);
+  });
+
+  it('walks the full happy path: both partners answer, session completes, score is exact', async () => {
+    const { session } = await repo.startSession(userA);
+    const questionIds = session.questions.map((question) => question.id);
+    expect(questionIds).toHaveLength(10);
+
+    // Self-answers alternate 0/1 per question so a guess cannot accidentally match
+    // by coincidence. A guesses B's self-answer correctly on the first 6 questions
+    // and wrong on the rest; B guesses A's self-answer correctly on the first 3
+    // questions and wrong on the rest.
+    const bSelf = questionIds.map((_, index) => index % 2);
+    const aSelf = questionIds.map((_, index) => 1 - (index % 2));
+    const aGuess = bSelf.map((value, index) => (index < 6 ? value : 1 - value));
+    const bGuess = aSelf.map((value, index) => (index < 3 ? value : 1 - value));
+
+    const aAnswers = questionIds.map((questionId, index) => ({
+      question_id: questionId,
+      self_index: aSelf[index]!,
+      guess_index: aGuess[index]!,
+    }));
+    const bAnswers = questionIds.map((questionId, index) => ({
+      question_id: questionId,
+      self_index: bSelf[index]!,
+      guess_index: bGuess[index]!,
+    }));
+
+    const afterA = await repo.submitAnswers(userA, session.id, aAnswers);
+    expect(afterA.status).toBe('active');
+    expect(afterA.i_completed).toBe(true);
+    expect(afterA.partner_completed).toBe(false);
+    expect(afterA.my_answers).toHaveLength(10);
+
+    const afterB = await repo.submitAnswers(userB, session.id, bAnswers);
+    expect(afterB.status).toBe('completed');
+    expect(afterB.completed_at).not.toBeNull();
+    expect(afterB.i_completed).toBe(true);
+    expect(afterB.partner_completed).toBe(true);
+
+    // A guessed right (guess=1 matches B's self=1) on questions 0-5: 6 hits.
+    // B guessed right (guess=0 matches A's self=0) on questions 0-2: 3 hits.
+    // Total 9 hits out of 20 possible = 45%.
+    expect(afterB.score_percent).toBe(45);
+
+    const result = await repo.result(userA, session.id);
+    expect(result.score_percent).toBe(45);
+    expect(result.completed_at).not.toBeNull();
+    expect(result.questions).toHaveLength(10);
+    expect(result.questions[0]).toMatchObject({
+      my_self_index: aSelf[0],
+      my_guess_index: aGuess[0],
+      partner_self_index: bSelf[0],
+      partner_guess_index: bGuess[0],
+      i_guessed_right: true,
+      partner_guessed_right: true,
+    });
+    expect(result.questions[9]).toMatchObject({
+      i_guessed_right: false,
+      partner_guessed_right: false,
+    });
+
+    // The partner's result view mirrors the same score with roles swapped.
+    const partnerResult = await repo.result(userB, session.id);
+    expect(partnerResult.score_percent).toBe(45);
+  });
+
+  it('rejects an incomplete or mismatched answer set', async () => {
+    const { session } = await repo.startSession(userA);
+    const questionIds = session.questions.map((question) => question.id);
+
+    await expect(
+      repo.submitAnswers(userA, session.id, [
+        { question_id: questionIds[0]!, self_index: 0, guess_index: 0 },
+      ]),
+    ).rejects.toMatchObject({ code: 'invalid_answers' });
+
+    await expect(
+      repo.submitAnswers(userA, session.id, [
+        ...questionIds.map((id) => ({ question_id: id, self_index: 0, guess_index: 0 })),
+        { question_id: randomUUID(), self_index: 0, guess_index: 0 },
+      ]),
+    ).rejects.toMatchObject({ code: 'invalid_answers' });
+
+    const options = session.questions[0]!.options;
+    await expect(
+      repo.submitAnswers(userA, session.id, questionIds.map((id) => ({
+        question_id: id,
+        self_index: options.length,
+        guess_index: 0,
+      }))),
+    ).rejects.toMatchObject({ code: 'invalid_answers' });
+  });
+
+  it('isolates sessions to their own couple', async () => {
+    const { session } = await repo.startSession(userA);
+    await expect(repo.submitAnswers(outsider, session.id, [])).rejects.toMatchObject({ code: 'session_not_found' });
+    await expect(repo.result(outsider, session.id)).rejects.toMatchObject({ code: 'session_not_found' });
+    expect(await repo.currentSession(outsider)).toBeNull();
+  });
+
+  it('blocks the answers endpoint once the session has completed', async () => {
+    const { session } = await repo.startSession(userA);
+    const questionIds = session.questions.map((question) => question.id);
+    const answers = questionIds.map((id) => ({ question_id: id, self_index: 0, guess_index: 0 }));
+    await repo.submitAnswers(userA, session.id, answers);
+    const completed = await repo.submitAnswers(userB, session.id, answers);
+    expect(completed.status).toBe('completed');
+
+    await expect(repo.submitAnswers(userA, session.id, answers)).rejects.toMatchObject({ code: 'session_completed' });
+  });
+
+  it('blocks the result endpoint before the session has completed', async () => {
+    const { session } = await repo.startSession(userA);
+    await expect(repo.result(userA, session.id)).rejects.toMatchObject({ code: 'session_not_completed' });
+  });
+
+  it('returns the couple\'s most recent session from currentSession', async () => {
+    expect(await repo.currentSession(userA)).toBeNull();
+    const { session } = await repo.startSession(userA);
+    const current = await repo.currentSession(userB);
+    expect(current?.id).toBe(session.id);
+  });
+});

apps/api/test/quiz.routes.test.ts

@@ -0,0 +1,144 @@
+import { Hono } from 'hono';
+import { describe, expect, it, vi } from 'vitest';
+import type { AuthIdentity } from '../src/auth.js';
+import type { QuizRepository } from '../src/domains/quiz/repository.js';
+import { registerQuizRoutes } from '../src/domains/quiz/routes.js';
+import { QuizError, type QuizSessionPayload } from '../src/domains/quiz/types.js';
+
+const identity: AuthIdentity = { id: '11111111-1111-4111-8111-111111111111', email: null, name: null, avatarUrl: null };
+const sessionId = '22222222-2222-4222-8222-222222222222';
+const questionId = '33333333-3333-4333-8333-333333333333';
+
+const session: QuizSessionPayload = {
+  id: sessionId,
+  status: 'active',
+  created_at: '2026-08-27T00:00:00.000Z',
+  completed_at: null,
+  score_percent: null,
+  questions: [
+    { id: questionId, prompt_self: 'Self prompt', prompt_guess: 'Guess prompt', options: ['A', 'B'] },
+  ],
+  my_answers: [],
+  partner_completed: false,
+  i_completed: false,
+};
+
+function setup(overrides: Partial<QuizRepository> = {}) {
+  const repository: QuizRepository = {
+    startSession: vi.fn(async () => ({ session, created: true })),
+    currentSession: vi.fn(async () => session),
+    submitAnswers: vi.fn(async () => session),
+    result: vi.fn(async () => ({
+      score_percent: 100,
+      completed_at: '2026-08-27T00:00:00.000Z',
+      questions: [],
+    })),
+    close: vi.fn(async () => undefined),
+    ...overrides,
+  };
+  const app = new Hono<{ Variables: { identity: AuthIdentity } }>();
+  app.use('/v1/*', async (c, next) => { c.set('identity', identity); await next(); });
+  registerQuizRoutes(app, repository);
+  return { app, repository };
+}
+
+function post(app: Hono<{ Variables: { identity: AuthIdentity } }>, path: string, body?: unknown) {
+  return app.request(path, {
+    method: 'POST',
+    headers: { 'content-type': 'application/json' },
+    body: body === undefined ? undefined : JSON.stringify(body),
+  });
+}
+
+describe('quiz routes', () => {
+  it('starts a session and returns 201 when a new one is created', async () => {
+    const { app, repository } = setup();
+    const response = await post(app, '/v1/quiz/sessions');
+    expect(response.status).toBe(201);
+    expect(await response.json()).toEqual({ session });
+    expect(repository.startSession).toHaveBeenCalledWith(identity.id);
+  });
+
+  it('returns 200 when starting resolves to an existing active session', async () => {
+    const { app } = setup({ startSession: vi.fn(async () => ({ session, created: false })) });
+    const response = await post(app, '/v1/quiz/sessions');
+    expect(response.status).toBe(200);
+  });
+
+  it('maps no_couple and partner_required to 409', async () => {
+    const { app } = setup({
+      startSession: vi.fn(async () => { throw new QuizError('no_couple', 'Join a couple first', 409); }),
+    });
+    const response = await post(app, '/v1/quiz/sessions');
+    expect(response.status).toBe(409);
+    expect(await response.json()).toMatchObject({ error: { code: 'no_couple' } });
+  });
+
+  it('returns the current session, including null when none exists', async () => {
+    const { app } = setup({ currentSession: vi.fn(async () => null) });
+    const response = await app.request('/v1/quiz/sessions/current');
+    expect(response.status).toBe(200);
+    expect(await response.json()).toEqual({ session: null });
+  });
+
+  it('rejects a malformed session id on the answers route', async () => {
+    const { app, repository } = setup();
+    const response = await post(app, '/v1/quiz/sessions/not-a-uuid/answers', {
+      answers: [{ question_id: questionId, self_index: 0, guess_index: 1 }],
+    });
+    expect(response.status).toBe(404);
+    expect(repository.submitAnswers).not.toHaveBeenCalled();
+  });
+
+  it('rejects an empty or malformed answer body', async () => {
+    const { app, repository } = setup();
+    expect((await post(app, `/v1/quiz/sessions/${sessionId}/answers`, { answers: [] })).status).toBe(400);
+    expect((await post(app, `/v1/quiz/sessions/${sessionId}/answers`, {})).status).toBe(400);
+    expect((await post(app, `/v1/quiz/sessions/${sessionId}/answers`, {
+      answers: [{ question_id: questionId, self_index: 0, guess_index: 1, extra: true }],
+    })).status).toBe(400);
+    expect(repository.submitAnswers).not.toHaveBeenCalled();
+  });
+
+  it('submits valid answers and surfaces the updated session', async () => {
+    const { app, repository } = setup();
+    const answers = [{ question_id: questionId, self_index: 0, guess_index: 1 }];
+    const response = await post(app, `/v1/quiz/sessions/${sessionId}/answers`, { answers });
+    expect(response.status).toBe(200);
+    expect(repository.submitAnswers).toHaveBeenCalledWith(identity.id, sessionId, answers);
+  });
+
+  it('maps session errors to their status codes', async () => {
+    const { app } = setup({
+      submitAnswers: vi.fn(async () => { throw new QuizError('session_completed', 'Already finished', 409); }),
+    });
+    const response = await post(app, `/v1/quiz/sessions/${sessionId}/answers`, {
+      answers: [{ question_id: questionId, self_index: 0, guess_index: 1 }],
+    });
+    expect(response.status).toBe(409);
+    expect(await response.json()).toMatchObject({ error: { code: 'session_completed' } });
+  });
+
+  it('returns the result payload for a completed session', async () => {
+    const { app, repository } = setup();
+    const response = await app.request(`/v1/quiz/sessions/${sessionId}/result`);
+    expect(response.status).toBe(200);
+    expect(await response.json()).toMatchObject({ score_percent: 100 });
+    expect(repository.result).toHaveBeenCalledWith(identity.id, sessionId);
+  });
+
+  it('maps session_not_completed to 409 on the result route', async () => {
+    const { app } = setup({
+      result: vi.fn(async () => { throw new QuizError('session_not_completed', 'Not finished yet', 409); }),
+    });
+    const response = await app.request(`/v1/quiz/sessions/${sessionId}/result`);
+    expect(response.status).toBe(409);
+  });
+
+  it('rejects a malformed session id on the result route', async () => {
+    const { app, repository } = setup();
+    const response = await app.request('/v1/quiz/sessions/not-a-uuid/result');
+    expect(response.status).toBe(404);
+    expect(repository.result).not.toHaveBeenCalled();
+  });
+});

apps/api/test/quiz.service.test.ts

@@ -0,0 +1,56 @@
+import { describe, expect, it } from 'vitest';
+import { computeQuizScore, type QuizAnswerPair } from '../src/domains/quiz/service.js';
+
+function pair(overrides: Partial<QuizAnswerPair> = {}): QuizAnswerPair {
+  return {
+    questionId: 'q1',
+    aSelfIndex: 0,
+    aGuessIndex: 0,
+    bSelfIndex: 0,
+    bGuessIndex: 0,
+    ...overrides,
+  };
+}
+
+describe('computeQuizScore', () => {
+  it('scores 100% when every guess matches the partner self-answer in both directions', () => {
+    const pairs: QuizAnswerPair[] = [
+      pair({ questionId: 'q1', aSelfIndex: 1, aGuessIndex: 2, bSelfIndex: 2, bGuessIndex: 1 }),
+      pair({ questionId: 'q2', aSelfIndex: 0, aGuessIndex: 3, bSelfIndex: 3, bGuessIndex: 0 }),
+    ];
+    const { scorePercent } = computeQuizScore(pairs);
+    expect(scorePercent).toBe(100);
+  });
+
+  it('scores 0% when nobody guesses their partner correctly', () => {
+    const pairs: QuizAnswerPair[] = [
+      pair({ questionId: 'q1', aSelfIndex: 1, aGuessIndex: 0, bSelfIndex: 2, bGuessIndex: 3 }),
+    ];
+    expect(computeQuizScore(pairs).scorePercent).toBe(0);
+  });
+
+  it('counts each direction independently, so a half-right couple lands at 50%', () => {
+    // A guesses B correctly, but B guesses A incorrectly: one hit out of two possible.
+    const pairs: QuizAnswerPair[] = [
+      pair({ questionId: 'q1', aSelfIndex: 1, aGuessIndex: 2, bSelfIndex: 2, bGuessIndex: 0 }),
+    ];
+    const result = computeQuizScore(pairs);
+    expect(result.scorePercent).toBe(50);
+    expect(result.perQuestion[0]).toMatchObject({ aGuessedRight: true, bGuessedRight: false });
+  });
+
+  it('rounds to the nearest whole percent', () => {
+    // 1 hit out of 6 possible (3 questions * 2 directions) = 16.67%, rounds to 17.
+    const pairs: QuizAnswerPair[] = [
+      // aGuess (0) matches bSelf (0): one hit. bGuess (3) does not match aSelf (1).
+      pair({ questionId: 'q1', aSelfIndex: 1, aGuessIndex: 0, bSelfIndex: 0, bGuessIndex: 3 }),
+      pair({ questionId: 'q2', aSelfIndex: 0, aGuessIndex: 3, bSelfIndex: 0, bGuessIndex: 3 }),
+      pair({ questionId: 'q3', aSelfIndex: 0, aGuessIndex: 3, bSelfIndex: 0, bGuessIndex: 3 }),
+    ];
+    expect(computeQuizScore(pairs).scorePercent).toBe(17);
+  });
+
+  it('returns 0% for an empty question set instead of dividing by zero', () => {
+    expect(computeQuizScore([]).scorePercent).toBe(0);
+  });
+});

apps/mobile/app/(app)/index.tsx

@@ -8,7 +8,7 @@ import * as Haptics from 'expo-haptics';
 import { useAuthStore, useMatchStore, usePacksStore, useSubscriptionStore } from '../../src/store';
 import { GradientBackground } from '../../src/components/ui';
 import { Paywall } from '../../src/components/paywall';
-import { CompactHeader, ContentRow, DaresTile, LiveDrawTile, PendingQuestionsCard } from '../../src/components/discovery';
+import { CompactHeader, ContentRow, DaresTile, LiveDrawTile, PendingQuestionsCard, QuizTile } from '../../src/components/discovery';
 import { StreakDisplay } from '../../src/components/StreakDisplay';
 import { Events } from '../../src/lib/analytics';
 import { colors, spacing, typography } from '../../src/theme';
@@ -166,6 +166,9 @@ export default function DiscoveryScreen() {
           {/* Dares */}
           <DaresTile delay={200} />
 
+          {/* Quiz */}
+          <QuizTile delay={225} />
+
           {/* Content Rows by Category */}
           {packsByCategory.map((group, index) => (
             <ContentRow

apps/mobile/app/(app)/quiz.tsx

@@ -1,232 +1,5 @@
-import { View, Text, StyleSheet, Platform, Pressable, ActivityIndicator } from "react-native";
+import { QuizScreen } from "../../src/features/quiz";
-import { Ionicons } from "@expo/vector-icons";
+
-import Animated, { FadeInDown, FadeIn, useSharedValue, useAnimatedStyle, withSpring } from "react-native-reanimated";
+export default function QuizRoute() {
-import { GradientBackground } from "../../src/components/ui";
+    return <QuizScreen />;
-import { colors, spacing, radius, typography, animations } from "../../src/theme";
+}
-import { useFeatureInterest } from "../../src/hooks/useFeatureInterest";
-
-const ACCENT_COLOR = colors.premium.rose;
-
-const AnimatedPressable = Animated.createAnimatedComponent(Pressable);
-
-export default function QuizScreen() {
-    const { isInterested, isLoading, isToggling, toggleInterest, isAuthenticated } =
-        useFeatureInterest("quiz");
-
-    const scale = useSharedValue(1);
-    const animatedButtonStyle = useAnimatedStyle(() => ({
-        transform: [{ scale: scale.value }],
-    }));
-
-    const handlePressIn = () => {
-        scale.value = withSpring(0.96, animations.spring);
-    };
-
-    const handlePressOut = () => {
-        scale.value = withSpring(1, animations.spring);
-    };
-
-    return (
-        <GradientBackground>
-            <View style={styles.container}>
-                <Animated.View
-                    entering={FadeInDown.duration(600).springify()}
-                    style={styles.content}
-                >
-                    {/* Title section */}
-                    <Text style={styles.label}>CONNECTION</Text>
-                    <Text style={styles.title}>Quiz</Text>
-
-                    {/* Decorative separator */}
-                    <View style={styles.separator}>
-                        <View style={styles.separatorLine} />
-                        <View style={styles.separatorDiamond} />
-                        <View style={styles.separatorLine} />
-                    </View>
-
-                    {/* Coming soon badge */}
-                    <Animated.View
-                        entering={FadeIn.delay(300).duration(400)}
-                        style={styles.badge}
-                    >
-                        <Text style={styles.badgeText}>ARRIVING SOON</Text>
-                    </Animated.View>
-
-                    {/* Description */}
-                    <Text style={styles.description}>
-                        Discover the depths of your connection through carefully crafted questions that reveal how well you truly know each other.
-                    </Text>
-
-                    {/* Feature hints */}
-                    <View style={styles.features}>
-                        <View style={styles.featureItem}>
-                            <Ionicons name="sparkles" size={16} color={ACCENT_COLOR} />
-                            <Text style={styles.featureText}>Learn what makes each other tick</Text>
-                        </View>
-                        <View style={styles.featureItem}>
-                            <Ionicons name="flame-outline" size={16} color={ACCENT_COLOR} />
-                            <Text style={styles.featureText}>Deepen your bond</Text>
-                        </View>
-                        <View style={styles.featureItem}>
-                            <Ionicons name="ribbon-outline" size={16} color={ACCENT_COLOR} />
-                            <Text style={styles.featureText}>Track your journey</Text>
-                        </View>
-                    </View>
-
-                    {/* Bottom teaser */}
-                    <Text style={styles.teaser}>Something special is being crafted for you</Text>
-
-                    {/* Interest button - always reserve space to prevent layout shift */}
-                    <View style={styles.interestButtonContainer}>
-                        {isAuthenticated && !isLoading && (
-                            <Animated.View entering={FadeIn.delay(500).duration(400)}>
-                                <AnimatedPressable
-                                    onPress={toggleInterest}
-                                    onPressIn={handlePressIn}
-                                    onPressOut={handlePressOut}
-                                    disabled={isToggling}
-                                    style={[
-                                        styles.interestButton,
-                                        isInterested && styles.interestButtonActive,
-                                        animatedButtonStyle,
-                                    ]}
-                                >
-                                    {isToggling ? (
-                                        <ActivityIndicator size="small" color={ACCENT_COLOR} />
-                                    ) : (
-                                        <>
-                                            <Ionicons
-                                                name={isInterested ? "checkmark-circle" : "notifications-outline"}
-                                                size={16}
-                                                color={ACCENT_COLOR}
-                                            />
-                                            <Text style={styles.interestButtonText}>
-                                                {isInterested ? "You're on the list!" : "I'm interested"}
-                                            </Text>
-                                        </>
-                                    )}
-                                </AnimatedPressable>
-                            </Animated.View>
-                        )}
-                    </View>
-                </Animated.View>
-            </View>
-        </GradientBackground>
-    );
-}
-
-const styles = StyleSheet.create({
-    container: {
-        flex: 1,
-        justifyContent: 'center',
-        alignItems: 'center',
-        paddingHorizontal: spacing.lg,
-        paddingTop: 60,
-        paddingBottom: Platform.OS === 'ios' ? 120 : 100,
-    },
-    content: {
-        width: '100%',
-        alignItems: 'center',
-        paddingHorizontal: spacing.md,
-    },
-    label: {
-        ...typography.caption1,
-        fontWeight: '600',
-        letterSpacing: 3,
-        color: ACCENT_COLOR,
-        textAlign: 'center',
-        marginBottom: spacing.xs,
-    },
-    title: {
-        ...typography.largeTitle,
-        color: colors.text,
-        textAlign: 'center',
-    },
-    separator: {
-        flexDirection: 'row',
-        alignItems: 'center',
-        justifyContent: 'center',
-        marginVertical: spacing.lg,
-        width: 140,
-    },
-    separatorLine: {
-        flex: 1,
-        height: 1,
-        backgroundColor: 'rgba(232, 164, 174, 0.3)',
-    },
-    separatorDiamond: {
-        width: 6,
-        height: 6,
-        backgroundColor: ACCENT_COLOR,
-        transform: [{ rotate: '45deg' }],
-        marginHorizontal: spacing.md,
-        opacity: 0.6,
-    },
-    badge: {
-        backgroundColor: colors.backgroundLight,
-        paddingHorizontal: spacing.lg,
-        paddingVertical: spacing.sm,
-        borderRadius: radius.full,
-        borderWidth: 1,
-        borderColor: colors.border,
-        marginBottom: spacing.xl,
-    },
-    interestButton: {
-        flexDirection: 'row',
-        alignItems: 'center',
-        justifyContent: 'center',
-        backgroundColor: colors.backgroundLight,
-        paddingHorizontal: spacing.lg,
-        paddingVertical: spacing.sm + 2,
-        borderRadius: radius.full,
-        borderWidth: 1,
-        borderColor: colors.border,
-        gap: spacing.sm,
-    },
-    interestButtonActive: {
-        backgroundColor: colors.background,
-        borderColor: colors.primary,
-    },
-    interestButtonText: {
-        ...typography.subhead,
-        fontWeight: '600',
-        color: ACCENT_COLOR,
-    },
-    badgeText: {
-        ...typography.caption2,
-        fontWeight: '600',
-        letterSpacing: 2,
-        color: ACCENT_COLOR,
-    },
-    description: {
-        ...typography.body,
-        color: colors.textSecondary,
-        textAlign: 'center',
-        marginBottom: spacing.xl,
-        paddingHorizontal: spacing.md,
-    },
-    features: {
-        marginBottom: spacing.xl,
-    },
-    featureItem: {
-        flexDirection: 'row',
-        alignItems: 'center',
-        justifyContent: 'center',
-        marginBottom: spacing.sm,
-    },
-    featureText: {
-        ...typography.subhead,
-        color: colors.text,
-        marginLeft: spacing.sm,
-    },
-    teaser: {
-        ...typography.footnote,
-        fontStyle: 'italic',
-        color: colors.textTertiary,
-        textAlign: 'center',
-    },
-    interestButtonContainer: {
-        marginTop: spacing.xl,
-        minHeight: 44,
-    },
-});

apps/mobile/src/__tests__/stores/quizStore.test.ts

@@ -0,0 +1,126 @@
+import { ApiError } from "@/lib/apiClient";
+import { quizApi } from "@/features/quiz/services/quizApi";
+import { useQuizStore } from "@/store/quizStore";
+import type { QuizSession } from "@/features/quiz/types";
+
+jest.mock("@/features/quiz/services/quizApi", () => ({
+    quizApi: {
+        startSession: jest.fn(),
+        getCurrentSession: jest.fn(),
+        submitAnswers: jest.fn(),
+        getResult: jest.fn(),
+    },
+    getQuizErrorCode: (error: unknown) => {
+        const { ApiError: RealApiError } = jest.requireActual("@/lib/apiClient");
+        if (!(error instanceof RealApiError)) return null;
+        const details = (error as { details?: unknown }).details as { error?: { code?: string } } | undefined;
+        return details?.error?.code ?? null;
+    },
+}));
+
+function session(overrides: Partial<QuizSession> = {}): QuizSession {
+    return {
+        id: "session-1",
+        status: "active",
+        created_at: "2026-08-01T00:00:00.000Z",
+        completed_at: null,
+        score_percent: null,
+        questions: [
+            { id: "q1", prompt_self: "Self 1", prompt_guess: "Guess 1", options: ["A", "B"] },
+            { id: "q2", prompt_self: "Self 2", prompt_guess: "Guess 2", options: ["A", "B"] },
+        ],
+        my_answers: [],
+        partner_completed: false,
+        i_completed: false,
+        ...overrides,
+    };
+}
+
+const resetStore = () =>
+    useQuizStore.setState({
+        session: null,
+        result: null,
+        localAnswers: {},
+        isLoading: false,
+        isStarting: false,
+        isSubmitting: false,
+        isLoadingResult: false,
+        errorCode: null,
+        error: null,
+        generation: 0,
+    });
+
+describe("quizStore", () => {
+    beforeEach(() => {
+        jest.clearAllMocks();
+        resetStore();
+    });
+
+    it("starts a new session and resets local answers/result", async () => {
+        (quizApi.startSession as jest.Mock).mockResolvedValue({ session: session() });
+        await useQuizStore.getState().start();
+
+        expect(useQuizStore.getState().session?.id).toBe("session-1");
+        expect(useQuizStore.getState().localAnswers).toEqual({});
+        expect(useQuizStore.getState().isStarting).toBe(false);
+    });
+
+    it("records local self and guess answers per question without submitting early", () => {
+        useQuizStore.setState({ session: session() });
+        useQuizStore.getState().setSelfAnswer("q1", 0);
+        useQuizStore.getState().setGuessAnswer("q1", 1);
+
+        expect(useQuizStore.getState().localAnswers.q1).toEqual({ self_index: 0, guess_index: 1 });
+        expect(quizApi.submitAnswers).not.toHaveBeenCalled();
+    });
+
+    it("submits the full answer set built from local answers and stores the returned session", async () => {
+        useQuizStore.setState({
+            session: session(),
+            localAnswers: {
+                q1: { self_index: 0, guess_index: 1 },
+                q2: { self_index: 1, guess_index: 0 },
+            },
+        });
+        const updated = session({ i_completed: true });
+        (quizApi.submitAnswers as jest.Mock).mockResolvedValue({ session: updated });
+
+        const ok = await useQuizStore.getState().submit();
+
+        expect(ok).toBe(true);
+        expect(quizApi.submitAnswers).toHaveBeenCalledWith("session-1", [
+            { question_id: "q1", self_index: 0, guess_index: 1 },
+            { question_id: "q2", self_index: 1, guess_index: 0 },
+        ]);
+        expect(useQuizStore.getState().session?.i_completed).toBe(true);
+        expect(useQuizStore.getState().localAnswers).toEqual({});
+    });
+
+    it("surfaces a pairing error code instead of a generic message", async () => {
+        (quizApi.getCurrentSession as jest.Mock).mockRejectedValue(
+            new ApiError("no_couple", 409, { error: { code: "no_couple" } }),
+        );
+
+        await useQuizStore.getState().load();
+
+        expect(useQuizStore.getState().errorCode).toBe("no_couple");
+        expect(useQuizStore.getState().error).toBeNull();
+    });
+
+    it("clearQuiz resets all state and invalidates any in-flight request (sign-out)", async () => {
+        let resolve!: (value: unknown) => void;
+        (quizApi.getCurrentSession as jest.Mock).mockReturnValueOnce(
+            new Promise((done) => {
+                resolve = done;
+            }),
+        );
+        const staleLoad = useQuizStore.getState().load();
+
+        useQuizStore.getState().clearQuiz();
+        resolve({ session: session({ id: "stale-session" }) });
+        await staleLoad;
+
+        expect(useQuizStore.getState().session).toBeNull();
+        expect(useQuizStore.getState().generation).toBe(1);
+    });
+});

apps/mobile/src/components/discovery/QuizTile.tsx

@@ -0,0 +1,98 @@
+import { StyleSheet, View, Text, TouchableOpacity } from 'react-native';
+import { Ionicons } from '@expo/vector-icons';
+import { router } from 'expo-router';
+import * as Haptics from 'expo-haptics';
+import Animated, { FadeInDown } from 'react-native-reanimated';
+import { colors, spacing, radius, typography, shadows, featureColors } from '../../theme';
+import { useAuthStore } from '../../store';
+
+const HORIZONTAL_PADDING = spacing.lg;
+const TILE_HEIGHT = 100;
+const ACCENT = featureColors.quiz.accent;
+
+interface QuizTileProps {
+  delay?: number;
+}
+
+export function QuizTile({ delay = 0 }: QuizTileProps) {
+  const { user } = useAuthStore();
+  const paired = Boolean(user?.couple_id);
+
+  if (!paired) return null;
+
+  const handlePress = () => {
+    Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Light);
+    router.push('/(app)/quiz' as never);
+  };
+
+  return (
+    <Animated.View
+      entering={FadeInDown.delay(delay).duration(500).springify()}
+      style={styles.container}
+    >
+      <TouchableOpacity onPress={handlePress} activeOpacity={0.85} style={styles.tileWrapper}>
+        <View style={[styles.tile, shadows.md]}>
+          <View style={styles.iconContainer}>
+            <Ionicons name="help-circle" size={24} color="rgba(255, 255, 255, 0.9)" />
+          </View>
+
+          <View style={styles.content}>
+            <Text style={styles.title}>Quiz</Text>
+            <Text style={styles.subtitle}>How well do you know each other?</Text>
+          </View>
+
+          <Ionicons name="chevron-forward" size={20} color="rgba(255, 255, 255, 0.6)" />
+
+          <View style={styles.overlay} />
+        </View>
+      </TouchableOpacity>
+    </Animated.View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    marginBottom: spacing.lg,
+  },
+  tileWrapper: {
+    paddingHorizontal: HORIZONTAL_PADDING,
+  },
+  tile: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    backgroundColor: ACCENT,
+    borderRadius: radius.lg,
+    padding: spacing.md,
+    height: TILE_HEIGHT,
+    overflow: 'hidden',
+    position: 'relative',
+  },
+  iconContainer: {
+    width: 48,
+    height: 48,
+    borderRadius: 24,
+    backgroundColor: 'rgba(255, 255, 255, 0.2)',
+    justifyContent: 'center',
+    alignItems: 'center',
+    marginRight: spacing.md,
+  },
+  content: {
+    flex: 1,
+  },
+  title: {
+    ...typography.headline,
+    color: colors.text,
+    fontWeight: '700',
+  },
+  subtitle: {
+    ...typography.caption1,
+    color: 'rgba(255, 255, 255, 0.8)',
+    marginTop: 2,
+  },
+  overlay: {
+    ...StyleSheet.absoluteFillObject,
+    backgroundColor: 'rgba(0, 0, 0, 0.05)',
+    borderRadius: radius.lg,
+    pointerEvents: 'none',
+  },
+});

apps/mobile/src/components/discovery/index.ts

@@ -4,4 +4,5 @@ export { CompactHeader } from './CompactHeader';
 export { CircularProgress } from './CircularProgress';
 export { LiveDrawTile } from './LiveDrawTile';
 export { DaresTile } from './DaresTile';
+export { QuizTile } from './QuizTile';
 export { PendingQuestionsCard } from './PendingQuestionsCard';

apps/mobile/src/components/ui/GlassButton.tsx

@@ -30,6 +30,7 @@ interface GlassButtonProps {
   textStyle?: TextStyle;
   haptic?: boolean;
   icon?: React.ReactNode;
+  testID?: string;
 }
 
 const AnimatedPressable = Animated.createAnimatedComponent(Pressable);
@@ -46,6 +47,7 @@ export function GlassButton({
   textStyle,
   haptic = true,
   icon,
+  testID,
 }: GlassButtonProps) {
   const scale = useSharedValue(1);
 
@@ -104,6 +106,7 @@ export function GlassButton({
       onPressIn={handlePressIn}
       onPressOut={handlePressOut}
       disabled={disabled || loading}
+      testID={testID}
       style={[
         animatedStyle,
         fullWidth && styles.fullWidth,

apps/mobile/src/features/quiz/QuizScreen.tsx

@@ -0,0 +1,106 @@
+import { ActivityIndicator, View, StyleSheet } from "react-native";
+import { GradientBackground } from "../../components/ui";
+import { featureColors } from "../../theme";
+import { SwipeNoPartnerState } from "../swipe/components/SwipeNoPartnerState";
+import { useQuizScreen } from "./hooks/useQuizScreen";
+import {
+    QuizIntro,
+    QuizQuestionCard,
+    QuizResults,
+    QuizShareModal,
+    QuizWaitingState,
+} from "./components";
+
+export function QuizScreen() {
+    const {
+        screenState,
+        session,
+        result,
+        currentStep,
+        totalQuestions,
+        isStarting,
+        isSubmitting,
+        isLoadingResult,
+        shareModalVisible,
+        handleSelectOption,
+        handleStart,
+        handleNewQuiz,
+        handleRefresh,
+        handlePairPress,
+        handleNudgePartner,
+        openShareModal,
+        closeShareModal,
+    } = useQuizScreen();
+
+    if (screenState === "not_paired") {
+        return <SwipeNoPartnerState hasCouple={false} onPairPress={handlePairPress} />;
+    }
+
+    if (screenState === "loading") {
+        return (
+            <GradientBackground>
+                <View style={styles.loadingContainer}>
+                    <ActivityIndicator size="large" color={featureColors.quiz.accent} />
+                </View>
+            </GradientBackground>
+        );
+    }
+
+    if (screenState === "intro") {
+        return <QuizIntro isStarting={isStarting} onStart={handleStart} />;
+    }
+
+    if (screenState === "waiting") {
+        return <QuizWaitingState onNudgePartner={handleNudgePartner} onRefresh={handleRefresh} />;
+    }
+
+    if (screenState === "results") {
+        return (
+            <>
+                <QuizResults
+                    result={result}
+                    isLoadingResult={isLoadingResult}
+                    isStarting={isStarting}
+                    onNewQuiz={handleNewQuiz}
+                    onShare={openShareModal}
+                />
+                <QuizShareModal
+                    visible={shareModalVisible}
+                    onClose={closeShareModal}
+                    scorePercent={result?.score_percent ?? 0}
+                />
+            </>
+        );
+    }
+
+    // screenState === "answering"
+    if (!session || !currentStep || isSubmitting) {
+        return (
+            <GradientBackground>
+                <View style={styles.loadingContainer}>
+                    <ActivityIndicator size="large" color={featureColors.quiz.accent} />
+                </View>
+            </GradientBackground>
+        );
+    }
+
+    return (
+        <QuizQuestionCard
+            question={currentStep.question}
+            step={currentStep.step}
+            questionNumber={currentStep.questionNumber}
+            totalQuestions={totalQuestions}
+            onSelectOption={handleSelectOption}
+        />
+    );
+}
+
+const styles = StyleSheet.create({
+    loadingContainer: {
+        flex: 1,
+        justifyContent: "center",
+        alignItems: "center",
+    },
+});
+
+export default QuizScreen;

apps/mobile/src/features/quiz/components/QuizIntro.tsx

@@ -0,0 +1,118 @@
+import { StyleSheet, Text, View } from "react-native";
+import { Ionicons } from "@expo/vector-icons";
+import { LinearGradient } from "expo-linear-gradient";
+import Animated, { FadeInDown } from "react-native-reanimated";
+import { GlassButton, GradientBackground } from "../../../components/ui";
+import { colors, featureColors, radius, shadows, spacing, typography } from "../../../theme";
+
+const ACCENT = featureColors.quiz.accent;
+
+interface QuizIntroProps {
+    isStarting: boolean;
+    onStart: () => void;
+}
+
+export function QuizIntro({ isStarting, onStart }: QuizIntroProps) {
+    return (
+        <GradientBackground>
+            <View style={styles.container}>
+                <Animated.View entering={FadeInDown.duration(600).springify()} style={styles.content}>
+                    <LinearGradient
+                        colors={featureColors.quiz.gradient as [string, string]}
+                        style={styles.iconGradient}
+                        start={{ x: 0, y: 0 }}
+                        end={{ x: 1, y: 1 }}
+                    >
+                        <Ionicons name="help-circle" size={40} color={colors.text} />
+                    </LinearGradient>
+
+                    <Text style={styles.label}>CONNECTION</Text>
+                    <Text style={styles.title}>How well do you know each other?</Text>
+                    <Text style={styles.description}>
+                        Answer a set of questions about yourself, then guess how your partner
+                        answered. See how well you really know each other, and share your score.
+                    </Text>
+
+                    <View style={styles.badge}>
+                        <Ionicons name="list-outline" size={14} color={ACCENT} />
+                        <Text style={styles.badgeText}>10 questions</Text>
+                    </View>
+
+                    <GlassButton
+                        onPress={onStart}
+                        loading={isStarting}
+                        disabled={isStarting}
+                        fullWidth
+                        size="lg"
+                        style={styles.startButton}
+                        testID="quiz-start"
+                    >
+                        Start the quiz
+                    </GlassButton>
+                </Animated.View>
+            </View>
+        </GradientBackground>
+    );
+}
+
+const styles = StyleSheet.create({
+    container: {
+        flex: 1,
+        justifyContent: "center",
+        alignItems: "center",
+        paddingHorizontal: spacing.lg,
+    },
+    content: {
+        width: "100%",
+        alignItems: "center",
+    },
+    iconGradient: {
+        width: 88,
+        height: 88,
+        borderRadius: 44,
+        justifyContent: "center",
+        alignItems: "center",
+        marginBottom: spacing.lg,
+        ...shadows.lg,
+    },
+    label: {
+        ...typography.caption1,
+        fontWeight: "600",
+        letterSpacing: 3,
+        color: ACCENT,
+        textAlign: "center",
+        marginBottom: spacing.xs,
+    },
+    title: {
+        ...typography.title1,
+        color: colors.text,
+        textAlign: "center",
+        marginBottom: spacing.md,
+    },
+    description: {
+        ...typography.body,
+        color: colors.textSecondary,
+        textAlign: "center",
+        marginBottom: spacing.lg,
+    },
+    badge: {
+        flexDirection: "row",
+        alignItems: "center",
+        gap: spacing.xs,
+        backgroundColor: colors.backgroundLight,
+        paddingHorizontal: spacing.md,
+        paddingVertical: spacing.sm,
+        borderRadius: radius.full,
+        borderWidth: 1,
+        borderColor: colors.border,
+        marginBottom: spacing.xl,
+    },
+    badgeText: {
+        ...typography.caption1,
+        fontWeight: "600",
+        color: ACCENT,
+    },
+    startButton: {
+        marginTop: spacing.md,
+    },
+});

apps/mobile/src/features/quiz/components/QuizQuestionCard.tsx

@@ -0,0 +1,118 @@
+import { Pressable, StyleSheet, Text, View } from "react-native";
+import Animated, { FadeInDown } from "react-native-reanimated";
+import { GlassCard, GradientBackground } from "../../../components/ui";
+import { colors, featureColors, radius, spacing, typography } from "../../../theme";
+import type { QuizQuestion } from "../types";
+import type { QuizAnswerStep } from "../hooks/useQuizScreen";
+
+const ACCENT = featureColors.quiz.accent;
+
+interface QuizQuestionCardProps {
+    question: QuizQuestion;
+    step: QuizAnswerStep;
+    questionNumber: number;
+    totalQuestions: number;
+    onSelectOption: (index: number) => void;
+}
+
+export function QuizQuestionCard({
+    question,
+    step,
+    questionNumber,
+    totalQuestions,
+    onSelectOption,
+}: QuizQuestionCardProps) {
+    const prompt = step === "self" ? question.prompt_self : question.prompt_guess;
+
+    return (
+        <GradientBackground>
+            <View style={styles.container}>
+                <Text style={styles.progress} testID="quiz-progress">
+                    {questionNumber} of {totalQuestions}
+                </Text>
+
+                <View style={styles.stepBadge}>
+                    <Text style={styles.stepBadgeText}>{step === "self" ? "YOU" : "YOUR PARTNER"}</Text>
+                </View>
+
+                <Animated.View entering={FadeInDown.duration(400).springify()} key={`${question.id}-${step}`}>
+                    <GlassCard variant="elevated" style={styles.card}>
+                        <Text style={styles.prompt}>{prompt}</Text>
+                    </GlassCard>
+
+                    <View style={styles.options}>
+                        {question.options.map((option, index) => (
+                            <Pressable
+                                key={`${question.id}-${index}`}
+                                onPress={() => onSelectOption(index)}
+                                style={({ pressed }) => [styles.option, pressed && styles.optionPressed]}
+                                testID={`quiz-option-${index}`}
+                            >
+                                <Text style={styles.optionText}>{option}</Text>
+                            </Pressable>
+                        ))}
+                    </View>
+                </Animated.View>
+            </View>
+        </GradientBackground>
+    );
+}
+
+const styles = StyleSheet.create({
+    container: {
+        flex: 1,
+        paddingHorizontal: spacing.lg,
+        paddingTop: 80,
+    },
+    progress: {
+        ...typography.caption1,
+        color: colors.textTertiary,
+        textAlign: "center",
+        marginBottom: spacing.md,
+    },
+    stepBadge: {
+        alignSelf: "center",
+        backgroundColor: colors.backgroundLight,
+        paddingHorizontal: spacing.md,
+        paddingVertical: spacing.sm,
+        borderRadius: radius.full,
+        borderWidth: 1,
+        borderColor: colors.border,
+        marginBottom: spacing.lg,
+    },
+    stepBadgeText: {
+        ...typography.caption2,
+        fontWeight: "600",
+        letterSpacing: 2,
+        color: ACCENT,
+    },
+    card: {
+        marginBottom: spacing.xl,
+    },
+    prompt: {
+        ...typography.title2,
+        color: colors.text,
+        textAlign: "center",
+    },
+    options: {
+        gap: spacing.md,
+    },
+    option: {
+        backgroundColor: colors.backgroundLight,
+        borderRadius: radius.lg,
+        borderWidth: 1,
+        borderColor: colors.border,
+        paddingVertical: spacing.md,
+        paddingHorizontal: spacing.lg,
+    },
+    optionPressed: {
+        borderColor: ACCENT,
+        backgroundColor: colors.background,
+    },
+    optionText: {
+        ...typography.body,
+        color: colors.text,
+        textAlign: "center",
+        fontWeight: "600",
+    },
+});

apps/mobile/src/features/quiz/components/QuizResults.tsx

@@ -0,0 +1,173 @@
+import { ActivityIndicator, ScrollView, StyleSheet, Text, View } from "react-native";
+import { Ionicons } from "@expo/vector-icons";
+import { LinearGradient } from "expo-linear-gradient";
+import Animated, { FadeInDown } from "react-native-reanimated";
+import { GlassButton, GlassCard, GradientBackground } from "../../../components/ui";
+import { colors, featureColors, radius, spacing, typography } from "../../../theme";
+import type { QuizResult } from "../types";
+
+interface QuizResultsProps {
+    result: QuizResult | null;
+    isLoadingResult: boolean;
+    isStarting: boolean;
+    onNewQuiz: () => void;
+    onShare: () => void;
+}
+
+export function QuizResults({ result, isLoadingResult, isStarting, onNewQuiz, onShare }: QuizResultsProps) {
+    if (!result) {
+        return (
+            <GradientBackground>
+                <View style={styles.loadingContainer}>
+                    <ActivityIndicator size="large" color={featureColors.quiz.accent} />
+                    <Text style={styles.loadingText}>
+                        {isLoadingResult ? "Tallying your answers..." : "Loading your results..."}
+                    </Text>
+                </View>
+            </GradientBackground>
+        );
+    }
+
+    return (
+        <GradientBackground>
+            <ScrollView contentContainerStyle={styles.container} showsVerticalScrollIndicator={false}>
+                <Animated.View entering={FadeInDown.duration(500).springify()}>
+                    <LinearGradient
+                        colors={featureColors.quiz.gradient as [string, string]}
+                        style={styles.hero}
+                        start={{ x: 0, y: 0 }}
+                        end={{ x: 1, y: 1 }}
+                    >
+                        <Text style={styles.heroLabel}>YOU MATCHED ON</Text>
+                        <Text style={styles.heroScore} testID="quiz-score">
+                            {result.score_percent}%
+                        </Text>
+                        <Text style={styles.heroTagline}>How well do you know each other?</Text>
+                    </LinearGradient>
+                </Animated.View>
+
+                <View style={styles.breakdown}>
+                    {result.questions.map((question) => (
+                        <GlassCard key={question.question_id} style={styles.questionCard}>
+                            <Text style={styles.questionPrompt}>{question.prompt_self}</Text>
+                            <View style={styles.resultRow}>
+                                <Ionicons
+                                    name={question.i_guessed_right ? "checkmark-circle" : "close-circle"}
+                                    size={18}
+                                    color={question.i_guessed_right ? colors.success : colors.error}
+                                />
+                                <Text style={styles.resultText}>
+                                    {question.i_guessed_right ? "You guessed right" : "You guessed wrong"}
+                                </Text>
+                            </View>
+                            <View style={styles.resultRow}>
+                                <Ionicons
+                                    name={question.partner_guessed_right ? "checkmark-circle" : "close-circle"}
+                                    size={18}
+                                    color={question.partner_guessed_right ? colors.success : colors.error}
+                                />
+                                <Text style={styles.resultText}>
+                                    {question.partner_guessed_right
+                                        ? "Your partner guessed right"
+                                        : "Your partner guessed wrong"}
+                                </Text>
+                            </View>
+                        </GlassCard>
+                    ))}
+                </View>
+
+                <GlassButton
+                    onPress={onShare}
+                    fullWidth
+                    size="lg"
+                    style={styles.shareButton}
+                    icon={<Ionicons name="share-outline" size={20} color={colors.text} />}
+                    testID="quiz-share"
+                >
+                    Share your score
+                </GlassButton>
+
+                <GlassButton
+                    variant="secondary"
+                    onPress={onNewQuiz}
+                    loading={isStarting}
+                    disabled={isStarting}
+                    fullWidth
+                    style={styles.newQuizButton}
+                >
+                    Take another quiz
+                </GlassButton>
+            </ScrollView>
+        </GradientBackground>
+    );
+}
+
+const styles = StyleSheet.create({
+    loadingContainer: {
+        flex: 1,
+        justifyContent: "center",
+        alignItems: "center",
+        gap: spacing.md,
+    },
+    loadingText: {
+        ...typography.body,
+        color: colors.textSecondary,
+    },
+    container: {
+        paddingHorizontal: spacing.lg,
+        paddingTop: 60,
+        paddingBottom: spacing.xxl,
+    },
+    hero: {
+        borderRadius: radius.xl,
+        paddingVertical: spacing.xl,
+        paddingHorizontal: spacing.lg,
+        alignItems: "center",
+        marginBottom: spacing.lg,
+    },
+    heroLabel: {
+        ...typography.caption1,
+        fontWeight: "600",
+        letterSpacing: 3,
+        color: "rgba(255, 255, 255, 0.85)",
+        marginBottom: spacing.xs,
+    },
+    heroScore: {
+        ...typography.largeTitle,
+        fontSize: 56,
+        lineHeight: 64,
+        color: colors.text,
+        fontWeight: "800",
+    },
+    heroTagline: {
+        ...typography.subhead,
+        color: "rgba(255, 255, 255, 0.85)",
+        marginTop: spacing.xs,
+    },
+    breakdown: {
+        gap: spacing.sm,
+        marginBottom: spacing.xl,
+    },
+    questionCard: {
+        gap: spacing.xs,
+    },
+    questionPrompt: {
+        ...typography.subhead,
+        color: colors.text,
+        fontWeight: "600",
+        marginBottom: spacing.xs,
+    },
+    resultRow: {
+        flexDirection: "row",
+        alignItems: "center",
+        gap: spacing.sm,
+    },
+    resultText: {
+        ...typography.caption1,
+        color: colors.textSecondary,
+    },
+    shareButton: {
+        marginBottom: spacing.md,
+    },
+    newQuizButton: {},
+});

apps/mobile/src/features/quiz/components/QuizResultsShareCard.test.tsx

@@ -0,0 +1,15 @@
+import { render } from "@/test/test-utils";
+import { QuizResultsShareCard } from "./QuizResultsShareCard";
+
+describe("QuizResultsShareCard", () => {
+    it("renders the score and Sauci watermark without any question content", () => {
+        const { getByText, queryByText } = render(
+            <QuizResultsShareCard scorePercent={84} cardWidth={300} />,
+        );
+
+        expect(getByText("84%")).toBeTruthy();
+        expect(getByText("How well do you know each other?")).toBeTruthy();
+        expect(getByText("sauci.app")).toBeTruthy();
+        expect(queryByText(/prompt/i)).toBeNull();
+    });
+});

apps/mobile/src/features/quiz/components/QuizResultsShareCard.tsx

@@ -0,0 +1,98 @@
+import { Image, StyleSheet, Text, View } from "react-native";
+import { LinearGradient } from "expo-linear-gradient";
+import { featureColors, radius, spacing, typography } from "../../../theme";
+
+const logo = require("../../../../assets/logo.png");
+
+interface QuizResultsShareCardProps {
+    scorePercent: number;
+    cardWidth: number;
+}
+
+/**
+ * The card captured for sharing. Deliberately carries only the score, never the
+ * question text or answers, so a screenshot cannot leak either partner's content.
+ */
+export function QuizResultsShareCard({ scorePercent, cardWidth }: QuizResultsShareCardProps) {
+    return (
+        <View style={[styles.card, { width: cardWidth }]}>
+            <LinearGradient
+                colors={featureColors.quiz.gradient as [string, string]}
+                style={styles.gradient}
+                start={{ x: 0, y: 0 }}
+                end={{ x: 1, y: 1 }}
+            >
+                <View style={styles.overlay} />
+
+                <View style={styles.content}>
+                    <Text style={styles.tagline}>How well do you know each other?</Text>
+                    <Text style={styles.label}>WE MATCHED ON</Text>
+                    <Text style={styles.score}>{scorePercent}%</Text>
+                </View>
+
+                <View style={styles.branding}>
+                    <Image source={logo} style={styles.brandingLogo} />
+                    <Text style={styles.brandingText}>sauci.app</Text>
+                </View>
+            </LinearGradient>
+        </View>
+    );
+}
+
+const styles = StyleSheet.create({
+    card: {
+        aspectRatio: 0.7,
+        borderRadius: radius.xl,
+        overflow: "hidden",
+    },
+    gradient: {
+        flex: 1,
+        padding: spacing.lg,
+        justifyContent: "space-between",
+    },
+    overlay: {
+        ...StyleSheet.absoluteFillObject,
+        backgroundColor: "rgba(0, 0, 0, 0.08)",
+    },
+    content: {
+        flex: 1,
+        justifyContent: "center",
+        alignItems: "center",
+    },
+    tagline: {
+        ...typography.subhead,
+        color: "rgba(255, 255, 255, 0.85)",
+        textAlign: "center",
+        marginBottom: spacing.xl,
+    },
+    label: {
+        ...typography.caption1,
+        fontWeight: "600",
+        letterSpacing: 3,
+        color: "rgba(255, 255, 255, 0.85)",
+        marginBottom: spacing.xs,
+    },
+    score: {
+        ...typography.largeTitle,
+        fontSize: 64,
+        lineHeight: 72,
+        fontWeight: "800",
+        color: "#ffffff",
+    },
+    branding: {
+        flexDirection: "row",
+        alignItems: "center",
+        justifyContent: "center",
+        gap: spacing.sm,
+    },
+    brandingLogo: {
+        width: 24,
+        height: 24,
+        resizeMode: "contain",
+    },
+    brandingText: {
+        ...typography.subhead,
+        color: "#ffffff",
+        fontWeight: "600",
+    },
+});

apps/mobile/src/features/quiz/components/QuizShareModal.tsx

@@ -0,0 +1,286 @@
+import { useEffect, useRef, useState } from "react";
+import {
+    Linking,
+    Modal,
+    Platform,
+    Share,
+    StyleSheet,
+    Text,
+    TouchableOpacity,
+    View,
+    useWindowDimensions,
+} from "react-native";
+import { BlurView } from "expo-blur";
+import Animated, { FadeIn, FadeOut, SlideInDown, SlideOutDown } from "react-native-reanimated";
+import { Ionicons } from "@expo/vector-icons";
+import { useSafeAreaInsets } from "react-native-safe-area-context";
+import ViewShot from "react-native-view-shot";
+import * as Sharing from "expo-sharing";
+import * as FileSystem from "expo-file-system/legacy";
+import { colors, spacing, typography, blur } from "../../../theme";
+import { Events } from "../../../lib/analytics";
+import { QuizResultsShareCard } from "./QuizResultsShareCard";
+
+const MAX_CARD_WIDTH = 340;
+
+interface QuizShareModalProps {
+    visible: boolean;
+    onClose: () => void;
+    scorePercent: number;
+}
+
+export function QuizShareModal({ visible, onClose, scorePercent }: QuizShareModalProps) {
+    const insets = useSafeAreaInsets();
+    const { width: screenWidth } = useWindowDimensions();
+    const cardWidth = Math.min(screenWidth - 64, MAX_CARD_WIDTH);
+    const shareViewRef = useRef<ViewShot>(null);
+    const [capturedUri, setCapturedUri] = useState<string | null>(null);
+    const [isCapturing, setIsCapturing] = useState(false);
+
+    const shareMessage = `We matched on ${scorePercent}% on our couple quiz! Discover more on sauci.app`;
+
+    useEffect(() => {
+        if (visible && shareViewRef.current) {
+            setIsCapturing(true);
+            const timer = setTimeout(async () => {
+                try {
+                    const uri = await shareViewRef.current?.capture?.();
+                    if (uri) setCapturedUri(uri);
+                } catch (error) {
+                    console.error("Error capturing quiz share image:", error);
+                } finally {
+                    setIsCapturing(false);
+                }
+            }, 100);
+            return () => clearTimeout(timer);
+        }
+    }, [visible]);
+
+    useEffect(() => {
+        if (!visible) setCapturedUri(null);
+    }, [visible]);
+
+    const handleInstagramShare = async () => {
+        if (!capturedUri) return;
+
+        try {
+            const instagramUrl = "instagram://app";
+            const canOpenInstagram = await Linking.canOpenURL(instagramUrl);
+
+            if (canOpenInstagram && Platform.OS === "ios") {
+                await FileSystem.readAsStringAsync(capturedUri, {
+                    encoding: FileSystem.EncodingType.Base64,
+                });
+                const instagramStoriesUrl = "instagram-stories://share?source_application=com.sauci.app";
+                await Linking.openURL(instagramStoriesUrl);
+                Events.quizShared();
+            } else {
+                await handleMoreShare();
+            }
+        } catch (error) {
+            console.error("Instagram share error:", error);
+            await handleMoreShare();
+        }
+    };
+
+    const handleMessagesShare = async () => {
+        if (!capturedUri) {
+            await Share.share({ message: shareMessage });
+            Events.quizShared();
+            return;
+        }
+
+        try {
+            if (Platform.OS === "ios") {
+                await Sharing.shareAsync(capturedUri, { mimeType: "image/png", UTI: "public.png" });
+                Events.quizShared();
+            } else {
+                await handleMoreShare();
+            }
+        } catch (error) {
+            console.error("Messages share error:", error);
+            await Share.share({ message: shareMessage });
+            Events.quizShared();
+        }
+    };
+
+    const handleMoreShare = async () => {
+        if (!capturedUri) {
+            await Share.share({ message: shareMessage });
+            Events.quizShared();
+            return;
+        }
+
+        try {
+            const isAvailable = await Sharing.isAvailableAsync();
+            if (isAvailable) {
+                await Sharing.shareAsync(capturedUri, { mimeType: "image/png", dialogTitle: "Share your quiz score" });
+            } else {
+                await Share.share({ message: shareMessage });
+            }
+            Events.quizShared();
+        } catch (error) {
+            console.error("Share error:", error);
+        }
+    };
+
+    const useBlur = Platform.OS === "ios";
+
+    return (
+        <Modal visible={visible} transparent animationType="none" statusBarTranslucent onRequestClose={onClose}>
+            <View style={styles.overlay}>
+                <Animated.View
+                    entering={FadeIn.duration(200)}
+                    exiting={FadeOut.duration(200)}
+                    style={StyleSheet.absoluteFill}
+                >
+                    {useBlur ? (
+                        <BlurView intensity={blur.heavy} tint="dark" style={StyleSheet.absoluteFill} />
+                    ) : (
+                        <View style={styles.backdropFallback} />
+                    )}
+                </Animated.View>
+
+                <Animated.View
+                    entering={SlideInDown.springify().damping(20)}
+                    exiting={SlideOutDown.duration(200)}
+                    style={[styles.content, { paddingTop: insets.top }]}
+                >
+                    <View style={styles.header}>
+                        <TouchableOpacity
+                            style={styles.closeButton}
+                            onPress={onClose}
+                            hitSlop={{ top: 20, bottom: 20, left: 20, right: 20 }}
+                            testID="quiz-share-close"
+                        >
+                            <Ionicons name="close" size={28} color={colors.text} />
+                        </TouchableOpacity>
+                        <Text style={styles.title}>Share your score</Text>
+                        <View style={styles.headerSpacer} />
+                    </View>
+
+                    <View style={styles.previewContainer}>
+                        <ViewShot ref={shareViewRef} options={{ format: "png", quality: 1, result: "tmpfile" }}>
+                            <QuizResultsShareCard scorePercent={scorePercent} cardWidth={cardWidth} />
+                        </ViewShot>
+                    </View>
+
+                    <View style={[styles.actionsContainer, { paddingBottom: insets.bottom + spacing.lg }]}>
+                        <ShareActionButton
+                            icon="logo-instagram"
+                            label="Instagram"
+                            onPress={handleInstagramShare}
+                            disabled={isCapturing}
+                        />
+                        <ShareActionButton
+                            icon="chatbubble-ellipses"
+                            label="Messages"
+                            onPress={handleMessagesShare}
+                            disabled={isCapturing}
+                        />
+                        <ShareActionButton
+                            icon="share-outline"
+                            label="More"
+                            onPress={handleMoreShare}
+                            disabled={isCapturing}
+                        />
+                    </View>
+                </Animated.View>
+            </View>
+        </Modal>
+    );
+}
+
+function ShareActionButton({
+    icon,
+    label,
+    onPress,
+    disabled,
+}: {
+    icon: string;
+    label: string;
+    onPress: () => void;
+    disabled?: boolean;
+}) {
+    return (
+        <TouchableOpacity
+            style={styles.actionButton}
+            onPress={onPress}
+            disabled={disabled}
+            activeOpacity={0.7}
+            testID={`quiz-share-${icon}`}
+        >
+            <View style={styles.actionIconContainer}>
+                <Ionicons name={icon as any} size={28} color={colors.text} />
+            </View>
+            <Text style={styles.actionLabel}>{label}</Text>
+        </TouchableOpacity>
+    );
+}
+
+const styles = StyleSheet.create({
+    overlay: {
+        flex: 1,
+        backgroundColor: "rgba(0, 0, 0, 0.5)",
+    },
+    backdropFallback: {
+        flex: 1,
+        backgroundColor: "rgba(14, 14, 17, 0.95)",
+    },
+    content: {
+        flex: 1,
+    },
+    header: {
+        flexDirection: "row",
+        alignItems: "center",
+        justifyContent: "space-between",
+        paddingHorizontal: spacing.lg,
+        paddingVertical: spacing.md,
+    },
+    closeButton: {
+        width: 44,
+        height: 44,
+        justifyContent: "center",
+        alignItems: "center",
+    },
+    title: {
+        ...typography.headline,
+        color: colors.text,
+        fontWeight: "600",
+    },
+    headerSpacer: {
+        width: 44,
+    },
+    previewContainer: {
+        flex: 1,
+        justifyContent: "center",
+        alignItems: "center",
+        paddingHorizontal: spacing.lg,
+    },
+    actionsContainer: {
+        flexDirection: "row",
+        justifyContent: "center",
+        gap: spacing.xl,
+        paddingTop: spacing.xl,
+        paddingHorizontal: spacing.lg,
+    },
+    actionButton: {
+        alignItems: "center",
+        gap: spacing.sm,
+    },
+    actionIconContainer: {
+        width: 64,
+        height: 64,
+        borderRadius: 32,
+        justifyContent: "center",
+        alignItems: "center",
+        backgroundColor: colors.backgroundLight,
+        borderWidth: 1,
+        borderColor: colors.border,
+    },
+    actionLabel: {
+        ...typography.caption1,
+        color: colors.text,
+        fontWeight: "500",
+    },
+});

apps/mobile/src/features/quiz/components/QuizWaitingState.tsx

@@ -0,0 +1,27 @@
+import { SwipeInfoStateLayout } from "../../swipe/components/SwipeInfoStateLayout";
+import { colors } from "../../../theme";
+
+interface QuizWaitingStateProps {
+    onNudgePartner: () => void;
+    onRefresh: () => void;
+}
+
+export function QuizWaitingState({ onNudgePartner, onRefresh }: QuizWaitingStateProps) {
+    return (
+        <SwipeInfoStateLayout
+            accentColor={colors.premium.rose}
+            icon="checkmark-circle"
+            label="NICE WORK"
+            title="Your answers are in"
+            badgeText="WAITING ON YOUR PARTNER"
+            description="Nudge your partner to finish the quiz so you can both see how well you know each other."
+            features={[
+                { icon: "hourglass-outline", text: "Results unlock once you both finish" },
+                { icon: "heart-outline", text: "Share your match score together" },
+            ]}
+            teaser="Almost there"
+            action={{ label: "Nudge your partner", onPress: onNudgePartner }}
+            secondaryAction={{ label: "Refresh", onPress: onRefresh, icon: "refresh-outline" }}
+        />
+    );
+}

apps/mobile/src/features/quiz/components/index.ts

@@ -0,0 +1,6 @@
+export { QuizIntro } from "./QuizIntro";
+export { QuizQuestionCard } from "./QuizQuestionCard";
+export { QuizWaitingState } from "./QuizWaitingState";
+export { QuizResults } from "./QuizResults";
+export { QuizResultsShareCard } from "./QuizResultsShareCard";
+export { QuizShareModal } from "./QuizShareModal";

apps/mobile/src/features/quiz/hooks/useQuizScreen.test.ts

@@ -0,0 +1,116 @@
+import { act, renderHook, waitFor } from "@testing-library/react-native";
+import { useQuizScreen } from "./useQuizScreen";
+import { useQuizStore } from "../../../store/quizStore";
+import { quizApi } from "../services/quizApi";
+import type { QuizSession } from "../types";
+
+const mockRouterPush = jest.fn();
+jest.mock("expo-router", () => {
+    const React = jest.requireActual("react");
+    return {
+        useRouter: () => ({ push: mockRouterPush }),
+        // Mirrors react-navigation's real semantics closely enough for this hook:
+        // runs once per stable callback identity, not on every render.
+        useFocusEffect: (callback: () => void) => React.useEffect(callback, [callback]),
+    };
+});
+
+let mockAuth = { user: { couple_id: null as string | null }, partner: null as { id: string } | null };
+jest.mock("../../../store", () => ({
+    useAuthStore: () => mockAuth,
+}));
+
+jest.mock("../services/quizApi", () => ({
+    quizApi: {
+        startSession: jest.fn(),
+        getCurrentSession: jest.fn(),
+        submitAnswers: jest.fn(),
+        getResult: jest.fn(),
+    },
+    getQuizErrorCode: () => null,
+}));
+
+function session(overrides: Partial<QuizSession> = {}): QuizSession {
+    return {
+        id: "session-1",
+        status: "active",
+        created_at: "2026-08-01T00:00:00.000Z",
+        completed_at: null,
+        score_percent: null,
+        questions: [
+            { id: "q1", prompt_self: "Self 1", prompt_guess: "Guess 1", options: ["A", "B"] },
+        ],
+        my_answers: [],
+        partner_completed: false,
+        i_completed: false,
+        ...overrides,
+    };
+}
+
+describe("useQuizScreen", () => {
+    beforeEach(() => {
+        jest.clearAllMocks();
+        useQuizStore.setState({
+            session: null, result: null, localAnswers: {},
+            isLoading: false, isStarting: false, isSubmitting: false, isLoadingResult: false,
+            errorCode: null, error: null, generation: 0,
+        });
+        mockAuth = { user: { couple_id: null }, partner: null };
+    });
+
+    it("shows the not_paired state when the user has no couple or partner", async () => {
+        const { result } = renderHook(() => useQuizScreen());
+        expect(result.current.screenState).toBe("not_paired");
+
+        act(() => result.current.handlePairPress());
+        expect(mockRouterPush).toHaveBeenCalledWith("/pairing");
+    });
+
+    it("moves to intro once paired and no active session exists", async () => {
+        mockAuth = { user: { couple_id: "couple-1" }, partner: { id: "partner-1" } };
+        (quizApi.getCurrentSession as jest.Mock).mockResolvedValue({ session: null });
+
+        const { result } = renderHook(() => useQuizScreen());
+        await waitFor(() => expect(result.current.screenState).toBe("intro"));
+    });
+
+    it("walks self then guess for each question and submits once all are answered", async () => {
+        mockAuth = { user: { couple_id: "couple-1" }, partner: { id: "partner-1" } };
+        (quizApi.getCurrentSession as jest.Mock).mockResolvedValue({ session: session() });
+        (quizApi.submitAnswers as jest.Mock).mockResolvedValue({
+            session: session({ i_completed: true }),
+        });
+
+        const { result } = renderHook(() => useQuizScreen());
+        await waitFor(() => expect(result.current.screenState).toBe("answering"));
+        expect(result.current.currentStep?.step).toBe("self");
+
+        await act(async () => {
+            await result.current.handleSelectOption(0);
+        });
+        expect(result.current.currentStep?.step).toBe("guess");
+
+        await act(async () => {
+            await result.current.handleSelectOption(1);
+        });
+
+        expect(quizApi.submitAnswers).toHaveBeenCalledWith("session-1", [
+            { question_id: "q1", self_index: 0, guess_index: 1 },
+        ]);
+        await waitFor(() => expect(result.current.screenState).toBe("waiting"));
+    });
+
+    it("shows results once the session and both partners have completed", async () => {
+        mockAuth = { user: { couple_id: "couple-1" }, partner: { id: "partner-1" } };
+        (quizApi.getCurrentSession as jest.Mock).mockResolvedValue({
+            session: session({ status: "completed", i_completed: true, partner_completed: true, score_percent: 80 }),
+        });
+        (quizApi.getResult as jest.Mock).mockResolvedValue({
+            score_percent: 80, completed_at: "now", questions: [],
+        });
+
+        const { result } = renderHook(() => useQuizScreen());
+        await waitFor(() => expect(result.current.screenState).toBe("results"));
+        await waitFor(() => expect(result.current.result?.score_percent).toBe(80));
+    });
+});

apps/mobile/src/features/quiz/hooks/useQuizScreen.ts

@@ -0,0 +1,164 @@
+import { useCallback, useEffect, useMemo, useState } from "react";
+import { Share } from "react-native";
+import { useFocusEffect, useRouter } from "expo-router";
+import { useAuthStore } from "../../../store";
+import { useQuizStore } from "../../../store/quizStore";
+import { Events } from "../../../lib/analytics";
+import type { QuizQuestion } from "../types";
+
+export type QuizScreenState = "not_paired" | "loading" | "intro" | "answering" | "waiting" | "results";
+export type QuizAnswerStep = "self" | "guess";
+
+export interface CurrentQuizStep {
+    question: QuizQuestion;
+    step: QuizAnswerStep;
+    questionNumber: number;
+}
+
+export function useQuizScreen() {
+    const router = useRouter();
+    const { user, partner } = useAuthStore();
+    const {
+        session,
+        result,
+        localAnswers,
+        isLoading,
+        isStarting,
+        isSubmitting,
+        isLoadingResult,
+        errorCode,
+        load,
+        start,
+        setSelfAnswer,
+        setGuessAnswer,
+        submit,
+        loadResult,
+    } = useQuizStore();
+    const [shareModalVisible, setShareModalVisible] = useState(false);
+
+    const hasCouple = Boolean(user?.couple_id);
+    const hasPartner = Boolean(partner);
+    const paired = hasCouple && hasPartner;
+
+    useFocusEffect(
+        useCallback(() => {
+            if (paired) void load();
+        }, [paired, load]),
+    );
+
+    const isCompleted = session?.status === "completed";
+    const shouldShowResults = isCompleted || (session?.i_completed && session?.partner_completed);
+
+    useEffect(() => {
+        if (shouldShowResults && session && !result && !isLoadingResult) {
+            void loadResult();
+        }
+    }, [shouldShowResults, session, result, isLoadingResult, loadResult]);
+
+    const screenState: QuizScreenState = useMemo(() => {
+        if (!paired) return "not_paired";
+        if (isLoading && !session) return "loading";
+        if (!session) return "intro";
+        if (shouldShowResults) return "results";
+        if (session.i_completed && !session.partner_completed) return "waiting";
+        return "answering";
+    }, [paired, isLoading, session, shouldShowResults]);
+
+    // The first unanswered step across the question set, in order.
+    const currentStep: CurrentQuizStep | null = useMemo(() => {
+        if (!session) return null;
+        for (let i = 0; i < session.questions.length; i += 1) {
+            const question = session.questions[i];
+            const answer = localAnswers[question.id];
+            if (answer?.self_index === undefined) {
+                return { question, step: "self", questionNumber: i + 1 };
+            }
+            if (answer?.guess_index === undefined) {
+                return { question, step: "guess", questionNumber: i + 1 };
+            }
+        }
+        return null;
+    }, [session, localAnswers]);
+
+    const totalQuestions = session?.questions.length ?? 0;
+
+    const handleSelectOption = useCallback(
+        async (index: number) => {
+            if (!currentStep) return;
+            const { question, step } = currentStep;
+            if (step === "self") {
+                setSelfAnswer(question.id, index);
+                return;
+            }
+            setGuessAnswer(question.id, index);
+
+            // The guess just recorded may be the last one needed; submit as soon as
+            // every question has both a self and a guess answer.
+            const answers = useQuizStore.getState().localAnswers;
+            const isLastQuestion = totalQuestions > 0 && currentStep.questionNumber === totalQuestions;
+            if (isLastQuestion) {
+                const allAnswered = session!.questions.every((q) => {
+                    const a = q.id === question.id ? { ...answers[q.id], guess_index: index } : answers[q.id];
+                    return a?.self_index !== undefined && a?.guess_index !== undefined;
+                });
+                if (allAnswered) {
+                    await submit();
+                }
+            }
+        },
+        [currentStep, setSelfAnswer, setGuessAnswer, submit, totalQuestions, session],
+    );
+
+    const handleStart = useCallback(() => {
+        void start();
+    }, [start]);
+
+    const handleNewQuiz = useCallback(() => {
+        void start();
+    }, [start]);
+
+    const handleRefresh = useCallback(() => {
+        void load();
+    }, [load]);
+
+    const handlePairPress = useCallback(() => {
+        router.push("/pairing");
+    }, [router]);
+
+    const handleNudgePartner = useCallback(async () => {
+        try {
+            await Share.share({
+                message: "I just finished our couple quiz on Sauci, your turn!",
+            });
+            Events.quizPartnerNudged();
+        } catch (err) {
+            console.error("Error nudging partner:", err);
+        }
+    }, []);
+
+    const openShareModal = useCallback(() => setShareModalVisible(true), []);
+    const closeShareModal = useCallback(() => setShareModalVisible(false), []);
+
+    return {
+        screenState,
+        session,
+        result,
+        currentStep,
+        totalQuestions,
+        isStarting,
+        isSubmitting,
+        isLoadingResult,
+        isLoading,
+        errorCode,
+        hasCouple,
+        shareModalVisible,
+        handleSelectOption,
+        handleStart,
+        handleNewQuiz,
+        handleRefresh,
+        handlePairPress,
+        handleNudgePartner,
+        openShareModal,
+        closeShareModal,
+    };
+}

apps/mobile/src/features/quiz/index.ts

@@ -0,0 +1,4 @@
+export { QuizScreen, default } from "./QuizScreen";
+export { useQuizScreen } from "./hooks/useQuizScreen";
+export { quizApi, getQuizErrorCode } from "./services/quizApi";
+export * from "./types";

apps/mobile/src/features/quiz/services/quizApi.test.ts

@@ -0,0 +1,57 @@
+import { apiClient, ApiError } from "../../../lib/apiClient";
+import { getQuizErrorCode, quizApi } from "./quizApi";
+
+jest.mock("../../../lib/apiClient", () => {
+    const actual = jest.requireActual("../../../lib/apiClient");
+    return {
+        ...actual,
+        apiClient: { get: jest.fn(), post: jest.fn() },
+    };
+});
+
+const get = apiClient.get as jest.Mock;
+const post = apiClient.post as jest.Mock;
+
+describe("quizApi", () => {
+    beforeEach(() => {
+        jest.clearAllMocks();
+    });
+
+    it("starts a session against the couple quiz session endpoint", async () => {
+        post.mockResolvedValue({ session: { id: "s1" } });
+        await quizApi.startSession();
+        expect(post).toHaveBeenCalledWith("/v1/quiz/sessions");
+    });
+
+    it("reads the current session", async () => {
+        get.mockResolvedValue({ session: null });
+        await quizApi.getCurrentSession();
+        expect(get).toHaveBeenCalledWith("/v1/quiz/sessions/current");
+    });
+
+    it("submits the full answer set for a session", async () => {
+        post.mockResolvedValue({ session: { id: "s1" } });
+        const answers = [{ question_id: "q1", self_index: 0, guess_index: 1 }];
+        await quizApi.submitAnswers("s1", answers);
+        expect(post).toHaveBeenCalledWith("/v1/quiz/sessions/s1/answers", { answers });
+    });
+
+    it("encodes the session id when reading a result", async () => {
+        get.mockResolvedValue({ score_percent: 80, completed_at: "now", questions: [] });
+        await quizApi.getResult("s1/weird");
+        expect(get).toHaveBeenCalledWith("/v1/quiz/sessions/s1%2Fweird/result");
+    });
+});
+
+describe("getQuizErrorCode", () => {
+    it("reads the contract's { error: { code } } body off an ApiError", () => {
+        const error = new ApiError("no_couple", 409, { error: { code: "no_couple" } });
+        expect(getQuizErrorCode(error)).toBe("no_couple");
+    });
+
+    it("returns null for a non-ApiError or a body without a code", () => {
+        expect(getQuizErrorCode(new Error("boom"))).toBeNull();
+        expect(getQuizErrorCode(new ApiError("oops", 500, {}))).toBeNull();
+        expect(getQuizErrorCode(new ApiError("oops", 500, undefined))).toBeNull();
+    });
+});

apps/mobile/src/features/quiz/services/quizApi.ts

@@ -0,0 +1,23 @@
+import { apiClient, ApiError } from "../../../lib/apiClient";
+import type { QuizAnswer, QuizErrorCode, QuizResult, QuizSession } from "../types";
+
+const sessionPath = (sessionId: string) => `/v1/quiz/sessions/${encodeURIComponent(sessionId)}`;
+
+export const quizApi = {
+    startSession: () => apiClient.post<{ session: QuizSession }>("/v1/quiz/sessions"),
+    getCurrentSession: () => apiClient.get<{ session: QuizSession | null }>("/v1/quiz/sessions/current"),
+    submitAnswers: (sessionId: string, answers: QuizAnswer[]) =>
+        apiClient.post<{ session: QuizSession }>(`${sessionPath(sessionId)}/answers`, { answers }),
+    getResult: (sessionId: string) => apiClient.get<QuizResult>(`${sessionPath(sessionId)}/result`),
+};
+
+/**
+ * Reads the API's `{ error: { code } }` body out of an `ApiError`, so callers can
+ * branch on the contract's error codes instead of matching on message text.
+ */
+export function getQuizErrorCode(error: unknown): QuizErrorCode | null {
+    if (!(error instanceof ApiError)) return null;
+    const body = error.details as { error?: { code?: string } } | undefined;
+    const code = body?.error?.code;
+    return typeof code === "string" ? (code as QuizErrorCode) : null;
+}

apps/mobile/src/features/quiz/types.ts

@@ -0,0 +1,58 @@
+export interface QuizQuestion {
+    id: string;
+    prompt_self: string;
+    prompt_guess: string;
+    options: string[];
+}
+
+export interface QuizAnswer {
+    question_id: string;
+    self_index: number;
+    guess_index: number;
+}
+
+export interface QuizSession {
+    id: string;
+    status: "active" | "completed";
+    created_at: string;
+    completed_at: string | null;
+    score_percent: number | null;
+    questions: QuizQuestion[];
+    my_answers: QuizAnswer[];
+    partner_completed: boolean;
+    i_completed: boolean;
+}
+
+export interface QuizResultQuestion {
+    question_id: string;
+    prompt_self: string;
+    prompt_guess: string;
+    options: string[];
+    my_self_index: number;
+    my_guess_index: number;
+    partner_self_index: number;
+    partner_guess_index: number;
+    i_guessed_right: boolean;
+    partner_guessed_right: boolean;
+}
+
+export interface QuizResult {
+    score_percent: number;
+    completed_at: string;
+    questions: QuizResultQuestion[];
+}
+
+/** Known error codes the quiz API can surface as `{ error: { code } }`. */
+export type QuizErrorCode =
+    | "no_couple"
+    | "partner_required"
+    | "session_not_found"
+    | "session_completed"
+    | "invalid_answers"
+    | "session_not_completed";
+
+/** In-progress local answer for a question, before the full set is submitted. */
+export interface QuizLocalAnswer {
+    self_index?: number;
+    guess_index?: number;
+}

apps/mobile/src/lib/analytics.ts

@@ -273,6 +273,12 @@ export const Events = {
   // Invite events
   inviteCodeCopied: () => logEvent("invite_code_copied"),
 
+  // Quiz events
+  quizStarted: () => logEvent("quiz_started"),
+  quizCompleted: (scorePercent: number) => logEvent("quiz_completed", { score_percent: scorePercent }),
+  quizShared: () => logEvent("quiz_shared"),
+  quizPartnerNudged: () => logEvent("quiz_partner_nudged"),
+
   // Tutorial events
   tutorialStarted: (tutorial: "swipe" | "matches") =>
     logEvent("tutorial_started", { tutorial }),

apps/mobile/src/store/authStore.ts

@@ -35,7 +35,8 @@ const getOtherStores = () => {
     const { useNotificationPreferencesStore } = require("./notificationPreferencesStore");
     const { useStreakStore } = require("./streakStore");
     const { useResponsesStore } = require("./responsesStore");
-    return { useMatchStore, usePacksStore, useMessageStore, useSubscriptionStore, useNotificationPreferencesStore, useStreakStore, useResponsesStore };
+    const { useQuizStore } = require("./quizStore");
+    return { useMatchStore, usePacksStore, useMessageStore, useSubscriptionStore, useNotificationPreferencesStore, useStreakStore, useResponsesStore, useQuizStore };
 };
 
 
@@ -88,7 +89,7 @@ export const useAuthStore = create<AuthState>((set, get) => ({
             if (error instanceof ApiError && error.status === 401) {
                 console.log("[Auth] Session rejected by API, signing out");
                 set({ user: null, couple: null, partner: null, isAuthenticated: false, isAnonymous: false, isLoading: false });
-                const { useMatchStore, usePacksStore, useMessageStore, useSubscriptionStore, useNotificationPreferencesStore, useStreakStore, useResponsesStore } = getOtherStores();
+                const { useMatchStore, usePacksStore, useMessageStore, useSubscriptionStore, useNotificationPreferencesStore, useStreakStore, useResponsesStore, useQuizStore } = getOtherStores();
                 useMatchStore.getState().clearMatches();
                 usePacksStore.getState().clearPacks();
                 useMessageStore.getState().clearMessages();
@@ -96,6 +97,7 @@ export const useAuthStore = create<AuthState>((set, get) => ({
                 useNotificationPreferencesStore.getState().clearPreferences();
                 useStreakStore.getState().clearStreak();
                 useResponsesStore.getState().clearResponses();
+                useQuizStore.getState().clearQuiz();
                 await authClient.auth.signOut();
                 return;
             }
@@ -144,7 +146,7 @@ export const useAuthStore = create<AuthState>((set, get) => ({
              isLoading: false,
          });
         // Clear other stores
-        const { useMatchStore, usePacksStore, useMessageStore, useSubscriptionStore, useNotificationPreferencesStore, useStreakStore, useResponsesStore } = getOtherStores();
+        const { useMatchStore, usePacksStore, useMessageStore, useSubscriptionStore, useNotificationPreferencesStore, useStreakStore, useResponsesStore, useQuizStore } = getOtherStores();
         useMatchStore.getState().clearMatches();
         usePacksStore.getState().clearPacks();
         useMessageStore.getState().clearMessages();
@@ -152,6 +154,7 @@ export const useAuthStore = create<AuthState>((set, get) => ({
         useNotificationPreferencesStore.getState().clearPreferences();
         useStreakStore.getState().clearStreak();
         useResponsesStore.getState().clearResponses();
+        useQuizStore.getState().clearQuiz();
 
         // Clear badge on sign out
         const { clearBadge } = require("../lib/badge");
@@ -176,7 +179,7 @@ export const useAuthStore = create<AuthState>((set, get) => ({
         });
         // Clear other stores when user signs out
         if (user === null) {
-            const { useMatchStore, usePacksStore, useMessageStore, useSubscriptionStore, useNotificationPreferencesStore, useStreakStore, useResponsesStore } = getOtherStores();
+            const { useMatchStore, usePacksStore, useMessageStore, useSubscriptionStore, useNotificationPreferencesStore, useStreakStore, useResponsesStore, useQuizStore } = getOtherStores();
             useMatchStore.getState().clearMatches();
             usePacksStore.getState().clearPacks();
             useMessageStore.getState().clearMessages();
@@ -184,6 +187,7 @@ export const useAuthStore = create<AuthState>((set, get) => ({
             useNotificationPreferencesStore.getState().clearPreferences();
             useStreakStore.getState().clearStreak();
             useResponsesStore.getState().clearResponses();
+            useQuizStore.getState().clearQuiz();
             // Clear badge on sign out
             const { clearBadge } = require("../lib/badge");
             clearBadge();

apps/mobile/src/store/index.ts

@@ -11,3 +11,4 @@ export { useNotificationPreferencesStore } from "./notificationPreferencesStore"
 export type { NotificationPreferences } from "./notificationPreferencesStore";
 export { useStreakStore } from "./streakStore";
 export type { CoupleStreak } from "./streakStore";
+export { useQuizStore } from "./quizStore";

apps/mobile/src/store/quizStore.ts

@@ -0,0 +1,164 @@
+import { create } from "zustand";
+import { Events } from "../lib/analytics";
+import { getQuizErrorCode, quizApi } from "../features/quiz/services/quizApi";
+import type { QuizAnswer, QuizErrorCode, QuizLocalAnswer, QuizResult, QuizSession } from "../features/quiz/types";
+
+interface QuizState {
+    session: QuizSession | null;
+    result: QuizResult | null;
+    /** In-progress answers for the active session, keyed by question id, not yet submitted. */
+    localAnswers: Record<string, QuizLocalAnswer>;
+    isLoading: boolean;
+    isStarting: boolean;
+    isSubmitting: boolean;
+    isLoadingResult: boolean;
+    /** Set when the couple/partner state blocks the quiz (`no_couple`, `partner_required`). */
+    errorCode: QuizErrorCode | null;
+    error: string | null;
+    /** Bumped on clear/sign-out so a response that outlives it cannot write into the next account's store. */
+    generation: number;
+
+    load: () => Promise<void>;
+    start: () => Promise<void>;
+    setSelfAnswer: (questionId: string, index: number) => void;
+    setGuessAnswer: (questionId: string, index: number) => void;
+    submit: () => Promise<boolean>;
+    loadResult: () => Promise<void>;
+    reset: () => void;
+    clearQuiz: () => void;
+}
+
+export const useQuizStore = create<QuizState>((set, get) => ({
+    session: null,
+    result: null,
+    localAnswers: {},
+    isLoading: false,
+    isStarting: false,
+    isSubmitting: false,
+    isLoadingResult: false,
+    errorCode: null,
+    error: null,
+    generation: 0,
+
+    load: async () => {
+        const myGeneration = get().generation;
+        set({ isLoading: true, error: null, errorCode: null });
+        try {
+            const { session } = await quizApi.getCurrentSession();
+            if (get().generation !== myGeneration) return;
+            set({ session, isLoading: false, localAnswers: {} });
+        } catch (cause) {
+            if (get().generation !== myGeneration) return;
+            const code = getQuizErrorCode(cause);
+            console.error("Error loading quiz session:", cause);
+            set({ isLoading: false, errorCode: code, error: code ? null : "Could not load your quiz" });
+        }
+    },
+
+    start: async () => {
+        const myGeneration = get().generation;
+        set({ isStarting: true, error: null, errorCode: null });
+        try {
+            const { session } = await quizApi.startSession();
+            if (get().generation !== myGeneration) return;
+            set({ session, result: null, localAnswers: {}, isStarting: false });
+            Events.quizStarted();
+        } catch (cause) {
+            if (get().generation !== myGeneration) return;
+            const code = getQuizErrorCode(cause);
+            console.error("Error starting quiz:", cause);
+            set({ isStarting: false, errorCode: code, error: code ? null : "Could not start the quiz" });
+        }
+    },
+
+    setSelfAnswer: (questionId, index) => {
+        set((state) => ({
+            localAnswers: {
+                ...state.localAnswers,
+                [questionId]: { ...state.localAnswers[questionId], self_index: index },
+            },
+        }));
+    },
+
+    setGuessAnswer: (questionId, index) => {
+        set((state) => ({
+            localAnswers: {
+                ...state.localAnswers,
+                [questionId]: { ...state.localAnswers[questionId], guess_index: index },
+            },
+        }));
+    },
+
+    submit: async () => {
+        const state = get();
+        const session = state.session;
+        if (!session) return false;
+
+        const answers: QuizAnswer[] = session.questions.map((question) => {
+            const local = state.localAnswers[question.id] ?? {};
+            return {
+                question_id: question.id,
+                self_index: local.self_index ?? -1,
+                guess_index: local.guess_index ?? -1,
+            };
+        });
+
+        const myGeneration = state.generation;
+        set({ isSubmitting: true, error: null, errorCode: null });
+        try {
+            const { session: updated } = await quizApi.submitAnswers(session.id, answers);
+            if (get().generation !== myGeneration) return false;
+            set({ session: updated, isSubmitting: false, localAnswers: {} });
+            if (updated.score_percent !== null) {
+                Events.quizCompleted(updated.score_percent);
+            }
+            return true;
+        } catch (cause) {
+            if (get().generation !== myGeneration) return false;
+            const code = getQuizErrorCode(cause);
+            console.error("Error submitting quiz answers:", cause);
+            set({ isSubmitting: false, errorCode: code, error: code ? null : "Could not submit your answers" });
+            return false;
+        }
+    },
+
+    loadResult: async () => {
+        const session = get().session;
+        if (!session) return;
+
+        const myGeneration = get().generation;
+        set({ isLoadingResult: true, error: null });
+        try {
+            const result = await quizApi.getResult(session.id);
+            if (get().generation !== myGeneration) return;
+            set({ result, isLoadingResult: false });
+        } catch (cause) {
+            if (get().generation !== myGeneration) return;
+            const code = getQuizErrorCode(cause);
+            console.error("Error loading quiz result:", cause);
+            set({ isLoadingResult: false, errorCode: code, error: code ? null : "Could not load your results" });
+        }
+    },
+
+    /** Clears the in-memory quiz state without bumping the generation, e.g. after starting a new quiz. */
+    reset: () => {
+        set({ session: null, result: null, localAnswers: {}, error: null, errorCode: null });
+    },
+
+    clearQuiz: () => {
+        set((state) => ({
+            session: null,
+            result: null,
+            localAnswers: {},
+            isLoading: false,
+            isStarting: false,
+            isSubmitting: false,
+            isLoadingResult: false,
+            errorCode: null,
+            error: null,
+            // Invalidates any request already in flight: its generation check will
+            // fail and it will not be able to write into the next account's store.
+            generation: state.generation + 1,
+        }));
+    },
+}));

docs/index.md

@@ -24,6 +24,7 @@ historical notes. Agents should load only the section relevant to their task.
 - [Redemption codes](product/redemption.md)
 - [Mobile release process](releasing.md)
 - [Dares loop](dares-loop.md)
+- [Couples quiz](quiz.md)
 
 ## Feature and implementation references
 

docs/quiz.md

@@ -0,0 +1,100 @@
+# Couples quiz
+
+Maintained reference for the shareable "how well do you know each other?"
+quiz: a couple works through the same set of questions, each partner answers
+about themselves and guesses about the other, and the pair only sees a score
+once both have finished.
+
+## Ownership
+
+| Concern | Location |
+|---|---|
+| Schema and seed content | `apps/api/drizzle/0019_quiz.sql` |
+| HTTP contract | `apps/api/src/domains/quiz/routes.ts` |
+| Session and scoring rules | `apps/api/src/domains/quiz/repository.ts` |
+| Pure scoring function | `apps/api/src/domains/quiz/service.ts` (`computeQuizScore`) |
+
+## Session lifecycle
+
+```
+POST /v1/quiz/sessions ──► active session (10 questions, question order fixed at creation)
+   │
+   ├── each partner submits a full answer set (self + guess per question)
+   │
+   └── once BOTH partners have a complete set ──► session completes, score is computed
+```
+
+Only one active session exists per couple at a time (`quiz_sessions_one_active_per_couple_idx`,
+a partial unique index on `couple_id` where `status = 'active'`). Starting a
+quiz while one is already active returns that same session (`200`) instead of
+creating a second one; two simultaneous starts race safely because the
+partial unique index, not application locking, is the source of truth.
+
+Answers are submitted as one complete batch per call (`quiz_answers`, upsert
+on `(session_id, user_id, question_id)`). A submission must cover every
+question in the session exactly once, with every index inside that
+question's option list, or it is rejected with `400 invalid_answers`. A
+session that has already completed rejects further submissions with
+`409 session_completed`.
+
+## Scoring
+
+Each question contributes up to two hits: partner A's guess about B counts if
+it matches B's self-answer, and separately B's guess about A counts if it
+matches A's self-answer. `score_percent = round(100 * hits / (2 *
+question_count))`. `computeQuizScore` in `service.ts` is the pure,
+unit-tested implementation; the repository only assembles the per-question
+pairs and persists the result.
+
+## Couple isolation
+
+Every session and result lookup is scoped to the caller's own couple. A
+session ID that belongs to another couple returns `404 session_not_found`,
+never a hint that it exists elsewhere. Starting a quiz requires both a couple
+(`409 no_couple`) and a paired partner (`409 partner_required`).
+
+## HTTP contract
+
+| Method | Path | Notes |
+|---|---|---|
+| POST | `/v1/quiz/sessions` | `201` on a new session, `200` when an active one already exists |
+| GET | `/v1/quiz/sessions/current` | `{ session: SessionPayload \| null }`, most recent session for the couple |
+| POST | `/v1/quiz/sessions/:sessionId/answers` | `{ answers: [{ question_id, self_index, guess_index }] }` |
+| GET | `/v1/quiz/sessions/:sessionId/result` | `409 session_not_completed` before both partners finish |
+
+`SessionPayload` never includes the partner's raw answers before completion;
+per-question partner detail (`partner_self_index`, `partner_guess_index`,
+`partner_guessed_right`) is only exposed by the `/result` endpoint of a
+completed session.
+
+## Tests
+
+- `apps/api/test/quiz.service.test.ts`: unit tests for `computeQuizScore`
+- `apps/api/test/quiz.routes.test.ts`: HTTP contract and error mapping
+- `apps/api/test/quiz.integration.test.ts`: real PostgreSQL, covering the full
+  happy path with a hand-computed score, idempotent session start, couple
+  isolation, incomplete answer set rejection, and result blocked before
+  completion
+
+## Mobile client
+
+| Concern | Location |
+|---|---|
+| Feature screens, hooks, API client | `apps/mobile/src/features/quiz/` |
+| Zustand store (generation-counter pattern, cleared on sign-out) | `apps/mobile/src/store/quizStore.ts` |
+| Discovery entry point | `apps/mobile/src/components/discovery/QuizTile.tsx` |
+| Route wrapper | `apps/mobile/app/(app)/quiz.tsx` |
+
+The screen walks not-paired, intro, answering (one question at a time, self
+then guess), waiting-on-partner, and results states off `useQuizScreen`.
+Answers are held client-side per question until every question in the
+session has both a self and a guess index, then submitted as the one batch
+the API expects; the store never calls the answers endpoint more than once
+per session. Results render a shareable card (`QuizResultsShareCard` /
+`QuizShareModal`, following the `SharePreviewModal` capture pattern) carrying
+only the match score and Sauci branding, never question text or answers, so a
+screenshot cannot leak either partner's content.
+
+## Not in this version
+
+Question authoring tooling in the admin app is out of scope for this change.