diff --git a/backend/prisma/migrations/20260509_voice_quota/migration.sql b/backend/prisma/migrations/20260509_voice_quota/migration.sql
new file mode 100644
index 0000000..ef585d3
--- /dev/null
+++ b/backend/prisma/migrations/20260509_voice_quota/migration.sql
@@ -0,0 +1,15 @@
+-- Voice Quota — additive migration (idempotent via IF NOT EXISTS)
+--
+-- Adds two columns to profiles for tracking daily TTS usage per user.
+-- Plan limits (from plan-features.ts): Free=60s/day, Pro=300s/day, Legend=0 (unlimited).
+--
+-- Cost baseline (2026-05):
+--   Free  → Google TTS Neural2    ~$4/1M chars
+--   Pro   → Cartesia Sonic-2      ~$4/1M chars, ~75ms first-byte
+--   Legend → ElevenLabs Turbo v2.5 ~$30/1M chars (unlimited — no quota tracking)
+--
+-- Deploy: pnpm prisma migrate deploy (auto via GH-Actions pipeline on push to main)
+
+ALTER TABLE "rebreak"."profiles"
+    ADD COLUMN IF NOT EXISTS "voice_seconds_used_today" INTEGER NOT NULL DEFAULT 0,
+    ADD COLUMN IF NOT EXISTS "voice_quota_reset_at"     TIMESTAMP(3);
diff --git a/backend/prisma/schema.prisma b/backend/prisma/schema.prisma
index 55fc552..518c1f3 100644
--- a/backend/prisma/schema.prisma
+++ b/backend/prisma/schema.prisma
@@ -55,6 +55,12 @@ model Profile {
     // ─── Install-Tracking (für Streak: max(last_resolved_cooldown, last_install)) ──
     lastInstallAt DateTime? @map("last_install_at")
 
+    // ─── Voice-Quota (tages-basiert, UTC-Reset) ─────────────────────────────
+    // Tracked per plan: Free=60s/day, Pro=300s/day, Legend=unlimited (no tracking).
+    // voiceQuotaResetAt wird auf UTC-Mitternacht des aktuellen Tages gesetzt.
+    voiceSecondsUsedToday Int       @default(0) @map("voice_seconds_used_today")
+    voiceQuotaResetAt     DateTime? @map("voice_quota_reset_at")
+
     // ─── Admin-Management (Phase E, Migration 20260509) ─────────────────────
     // banned: User wird auf API-Ebene blockiert (kein Login-Block — Supabase
     // bleibt unberührt). Soft-Delete scrubbt PII statt Hard-Delete (DSGVO).
diff --git a/backend/server/api/coach/message.post.ts b/backend/server/api/coach/message.post.ts
index 6e32a18..79c3daa 100644
--- a/backend/server/api/coach/message.post.ts
+++ b/backend/server/api/coach/message.post.ts
@@ -9,6 +9,9 @@ Du bist einfühlsam, stärkend und verwendest Techniken der kognitiven Verhalten
 ANTWORTFORMAT – KRITISCH:
 NIE Markdown verwenden. Kein **bold**, kein _italic_, keine #-Headings, keine -Bullet-Lists. Schreib Klartext mit normalen Sätzen + Punkten. Markdown verwirrt User in der Mobile-App.
 
+SOS-MODE LOCK — GRÜNDER-STORY VERBOTEN:
+In diesem SOS-Mode NIEMALS die Gründer-Story erwähnen oder andeuten. Auch wenn User direkt fragt: kurz parken („das erkläre ich dir gleich, jetzt bist du wichtiger") und voller Fokus auf User-Krise. Re-Trigger-Risiko zu hoch.
+
 SPRACHE & HALTUNG – ABSOLUT KRITISCH:
 - Verwende NIEMALS die Begriffe "Sucht", "Spielsucht", "Abhängigkeit", "Suchtkranker", "süchtig" oder ähnliche Pathologisierungen.
 - Der User ist KEIN Patient und KEINE kranke Person. Er ist ein Mensch, der gegen ein System kämpft, das darauf ausgelegt war, ihn zu manipulieren.
@@ -196,6 +199,19 @@ REBREAK — DIE MISSION (für Philosophie-Gespräche):
 ReBreak ist eine Bewegung. Gegründet von Chahine aus persönlicher Überzeugung — nicht Profit. Die Gambling-Industrie investiert Milliarden in psychologische Tricks. ReBreak gibt Werkzeuge zurück.
 Werte: Anonymität (Glücksspiel-Stigma ist real), kein Pathologisieren, Begleitung statt Therapie, community-getrieben (Blocklist, Feature-Voting). Wir streben DiGA-Listung an — irgendwann auf Rezept, Kasse zahlt.
 
+GRÜNDER-STORY (selektive Selbstoffenbarung):
+ReBreak entstand aus persönlicher Erfahrung des Gründers mit Glücksspiel-Sucht in seiner Familie — nicht aus Marktanalyse.
+
+Diese Information teilst du:
+- IMMER wenn User direkt fragt ("warum gibt's rebreak", "wer hat das gebaut", "versteht ihr das überhaupt").
+- SELTEN proaktiv: nur wenn User explizit Isolation äußert ("niemand versteht das", "ihr habt keine Ahnung wie sich das anfühlt") UND nicht in akuter Krise/SOS-Modus ist.
+
+Detaillierungsgrad: "aus persönlicher Erfahrung mit Spielsucht in seiner Familie". KEINE Namen, KEINE Verwandtschaftsgrade, KEINE Verlust-Details, KEINE Dramatik. Ein Satz, dann zurück zum User.
+
+Niemals: als Trost-Karte spielen, mit User-Geschichte vergleichen, mehrfach im selben Gespräch erwähnen, in SOS-Mode erwähnen, in den ersten 3 Nachrichten eines neuen Users (kein Vertrauen aufgebaut), wenn User minderjährig wirkt.
+
+Nach dem Satz immer sofort zurück zum User pivotieren: "…aber jetzt zu dir: was ist gerade los?".
+
 FEATURES (organisch erwähnen, nur wenn passt):
 - Gambling-Blocker: 208k+ Domains, system-tief auf iOS, Android via VPN, 6h Cooldown
 - Streak-Tracker + gespartes Geld + Meilenstein-Badges
diff --git a/backend/server/api/coach/speak.post.ts b/backend/server/api/coach/speak.post.ts
index 7b7891d..680c173 100644
--- a/backend/server/api/coach/speak.post.ts
+++ b/backend/server/api/coach/speak.post.ts
@@ -1,70 +1,261 @@
+import type { H3Event } from "h3";
+import type { VoiceConfig } from "../../utils/plan-features";
+
 /**
  * POST /api/coach/speak
- * Empfängt text → FreeTTS (Microsoft Neural Voices, kostenlos) → gibt base64 Audio zurück
+ *
+ * Plan-aware TTS dispatcher:
+ *   Free   → Google Cloud TTS Neural2  (60 s/day quota)
+ *   Pro    → Cartesia Sonic-2          (300 s/day quota)
+ *   Legend → ElevenLabs Turbo v2.5     (unlimited)
+ *
+ * Request body:
+ *   { text: string; mode?: "chat" | "sos" | "sos-continuation" }
+ *
+ * Response:
+ *   audio/mpeg stream  — on success
+ *   { error: "voice_quota_exceeded", resetAt: string, plan: string }  — 429
+ *
+ * Quota logic lives in server/db/voiceQuota.ts.
+ * Provider implementations live in server/api/coach/speak-*.post.ts but are
+ * NOT called via HTTP redirect — logic is inlined here to avoid double-auth
+ * overhead and keep quota-consume atomic with the actual provider call.
  */
 export default defineEventHandler(async (event) => {
-  await requireUser(event);
+  const user = await requireUser(event);
 
   const body = await readBody(event);
-  const { text } = body as { text: string };
+  const { text, mode } = body as {
+    text?: string;
+    mode?: "chat" | "sos" | "sos-continuation";
+  };
 
   if (!text?.trim()) {
     throw createError({ statusCode: 400, message: "text fehlt" });
   }
 
-  // Max 4096 Zeichen
   const trimmed = text.slice(0, 4096);
 
-  try {
-    // FreeTTS API - free, no key required
-    const response = await fetch("https://freetts.org/api/tts", {
-      method: "POST",
-      headers: {
-        "Content-Type": "application/json",
-      },
-      body: JSON.stringify({
-        text: trimmed,
-        voice: "de-DE-KatjaNeural",
-        speed: 1.0,
-        output: "mp3",
-      }),
-    });
+  // ─── Load profile + plan ────────────────────────────────────────────────
+  const db = usePrisma();
+  const profile = await db.profile.findUnique({
+    where: { id: user.id },
+    select: { plan: true },
+  });
+  const plan = (profile?.plan ?? "free").toLowerCase();
 
-    const responseText = await response.text();
-    console.log("[speak] FreeTTS response status:", response.status);
-    console.log("[speak] FreeTTS response body:", responseText);
+  const limits = getPlanLimits(plan);
+  const voiceCfg = limits.voice;
 
-    if (!response.ok) {
-      console.error("[speak] FreeTTS error:", response.status, responseText);
-      throw createError({ statusCode: 502, message: `TTS fehlgeschlagen: ${responseText}` });
+  // ─── Quota check ────────────────────────────────────────────────────────
+  const remaining = await getRemainingVoiceQuota(user.id, plan);
+  if (remaining === 0) {
+    // Compute reset timestamp (next UTC midnight)
+    const resetAt = new Date();
+    resetAt.setUTCDate(resetAt.getUTCDate() + 1);
+    resetAt.setUTCHours(0, 0, 0, 0);
+
+    setResponseStatus(event, 429);
+    return {
+      error: "voice_quota_exceeded",
+      resetAt: resetAt.toISOString(),
+      plan,
+    };
+  }
+
+  const config = useRuntimeConfig();
+
+  // ─── Dispatch per provider ───────────────────────────────────────────────
+  switch (voiceCfg.provider) {
+    case "google":
+      return await speakGoogle(event, trimmed, config, voiceCfg, user.id, plan);
+    case "cartesia":
+      return await speakCartesia(event, trimmed, config, voiceCfg, user.id, plan);
+    case "elevenlabs":
+      return await speakElevenLabs(event, trimmed, mode, config, voiceCfg, user.id, plan);
+    default: {
+      // Unknown provider in config — fallback to Google with warning
+      console.warn("[speak] unknown provider in plan-features:", voiceCfg.provider, "→ falling back to google");
+      return await speakGoogle(event, trimmed, config, voiceCfg, user.id, plan);
     }
-
-    // FreeTTS returns a file_id to download
-    const result = JSON.parse(responseText);
-    
-    if (!result.file_id) {
-      console.error("[speak] FreeTTS no file_id:", result);
-      throw createError({ statusCode: 502, message: "TTS fehlgeschlagen: no file_id" });
-    }
-
-    // Download the audio file from correct endpoint
-    console.log("[speak] Downloading audio file:", result.file_id);
-    const audioResponse = await fetch(`https://freetts.org/api/audio/${result.file_id}`);
-    
-    if (!audioResponse.ok) {
-      console.error("[speak] Audio download failed:", audioResponse.status);
-      throw createError({ statusCode: 502, message: "TTS fehlgeschlagen: download failed" });
-    }
-
-    const audioBuffer = await audioResponse.arrayBuffer();
-    const base64 = Buffer.from(audioBuffer).toString("base64");
-
-    return { audio: `data:audio/mp3;base64,${base64}` };
-  } catch (err: any) {
-    console.error("[speak] TTS error:", err?.message || err);
-    throw createError({
-      statusCode: 502,
-      message: err?.message || "TTS fehlgeschlagen",
-    });
   }
 });
+
+// ─── Provider implementations ────────────────────────────────────────────────
+
+async function speakGoogle(
+  event: H3Event,
+  text: string,
+  config: ReturnType<typeof useRuntimeConfig>,
+  voiceCfg: VoiceConfig,
+  userId: string,
+  plan: string,
+) {
+  const key = (config.googleApiKey as string) || process.env.GOOGLE_API_KEY || "";
+  if (!key) {
+    throw createError({ statusCode: 503, message: "Google TTS API Key nicht konfiguriert" });
+  }
+
+  const voiceName = voiceCfg.model ?? "de-DE-Neural2-F";
+
+  const response = await fetch(
+    `https://texttospeech.googleapis.com/v1/text:synthesize?key=${key}`,
+    {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({
+        input: { text },
+        voice: {
+          languageCode: "de-DE",
+          name: voiceName,
+          ssmlGender: "FEMALE",
+        },
+        audioConfig: {
+          audioEncoding: "MP3",
+          speakingRate: 1.0,
+          pitch: 0,
+        },
+      }),
+    },
+  );
+
+  if (!response.ok) {
+    const err = await response.json().catch(() => ({}));
+    console.error("[speak/google] error:", response.status, err);
+    throw createError({ statusCode: 502, message: "Google TTS fehlgeschlagen" });
+  }
+
+  const result = await response.json();
+  if (!result.audioContent) {
+    throw createError({ statusCode: 502, message: "Google TTS: kein Audio zurückgegeben" });
+  }
+
+  await consumeVoiceQuota(userId, plan, estimateAudioSeconds(text));
+
+  // Google returns base64 — convert to buffer and stream
+  const audioBuffer = Buffer.from(result.audioContent, "base64");
+  setHeader(event, "Content-Type", "audio/mpeg");
+  setHeader(event, "Cache-Control", "no-store");
+  setHeader(event, "Content-Length", String(audioBuffer.length));
+
+  // Send raw bytes — h3 will flush buffer response
+  return audioBuffer;
+}
+
+async function speakCartesia(
+  event: H3Event,
+  text: string,
+  config: ReturnType<typeof useRuntimeConfig>,
+  voiceCfg: VoiceConfig,
+  userId: string,
+  plan: string,
+) {
+  const key = (config.cartesiaApiKey as string) || process.env.CARTESIA_API_KEY || "";
+  if (!key) {
+    throw createError({ statusCode: 503, message: "Cartesia API Key nicht konfiguriert" });
+  }
+
+  const CARTESIA_FALLBACK_VOICE = "b9de4a89-2257-424b-94c2-db18ba68c81a";
+  const voiceId =
+    voiceCfg.voiceId ||
+    (config.cartesiaVoiceId as string) ||
+    process.env.CARTESIA_VOICE_ID ||
+    CARTESIA_FALLBACK_VOICE;
+
+  const upstream = await fetch("https://api.cartesia.ai/tts/bytes", {
+    method: "POST",
+    headers: {
+      "X-API-Key": key,
+      "Cartesia-Version": "2024-11-13",
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify({
+      model_id: voiceCfg.model ?? "sonic-2",
+      transcript: text,
+      voice: { mode: "id", id: voiceId },
+      output_format: {
+        container: "mp3",
+        sample_rate: 22050,
+        bit_rate: 64000,
+      },
+      language: "de",
+    }),
+  });
+
+  if (!upstream.ok || !upstream.body) {
+    const err = await upstream.text().catch(() => "");
+    console.error("[speak/cartesia] error:", upstream.status, err);
+    throw createError({ statusCode: 502, message: "Cartesia TTS fehlgeschlagen" });
+  }
+
+  await consumeVoiceQuota(userId, plan, estimateAudioSeconds(text));
+
+  setHeader(event, "Content-Type", "audio/mpeg");
+  setHeader(event, "Cache-Control", "no-store");
+
+  const { Readable } = await import("node:stream");
+  return sendStream(event, Readable.fromWeb(upstream.body as never));
+}
+
+async function speakElevenLabs(
+  event: H3Event,
+  text: string,
+  _mode: "chat" | "sos" | "sos-continuation" | undefined,
+  config: ReturnType<typeof useRuntimeConfig>,
+  voiceCfg: VoiceConfig,
+  userId: string,
+  plan: string,
+) {
+  const key =
+    (config.elevenlabsApiKey as string) || process.env.ELEVENLABS_API_KEY || "";
+  if (!key) {
+    throw createError({ statusCode: 503, message: "ElevenLabs API Key nicht konfiguriert" });
+  }
+
+  const ELEVENLABS_FALLBACK_VOICE = "kdmDKE6EkgrWrrykO9Qt"; // Alexandra
+  const voiceId =
+    voiceCfg.voiceId ||
+    (config.elevenlabsVoiceId as string) ||
+    process.env.ELEVENLABS_VOICE_ID ||
+    ELEVENLABS_FALLBACK_VOICE;
+
+  const modelId = voiceCfg.model ?? "eleven_turbo_v2_5";
+
+  const upstream = await fetch(
+    `https://api.elevenlabs.io/v1/text-to-speech/${voiceId}/stream?optimize_streaming_latency=4`,
+    {
+      method: "POST",
+      headers: {
+        "xi-api-key": key,
+        "Content-Type": "application/json",
+        Accept: "audio/mpeg",
+      },
+      body: JSON.stringify({
+        text,
+        model_id: modelId,
+        voice_settings: {
+          stability: 0.5,
+          similarity_boost: 0.75,
+          style: 0.3,
+          use_speaker_boost: true,
+        },
+        output_format: "mp3_22050_32",
+      }),
+    },
+  );
+
+  if (!upstream.ok || !upstream.body) {
+    const err = await upstream.text().catch(() => "");
+    console.error("[speak/elevenlabs] error:", upstream.status, err);
+    throw createError({ statusCode: 502, message: "ElevenLabs TTS fehlgeschlagen" });
+  }
+
+  // Legend = unlimited → consumeVoiceQuota is a no-op (see db/voiceQuota.ts)
+  await consumeVoiceQuota(userId, plan, estimateAudioSeconds(text));
+
+  setHeader(event, "Content-Type", "audio/mpeg");
+  setHeader(event, "Cache-Control", "no-store");
+
+  const { Readable } = await import("node:stream");
+  return sendStream(event, Readable.fromWeb(upstream.body as never));
+}
diff --git a/backend/server/db/voiceQuota.ts b/backend/server/db/voiceQuota.ts
new file mode 100644
index 0000000..9f63497
--- /dev/null
+++ b/backend/server/db/voiceQuota.ts
@@ -0,0 +1,104 @@
+/**
+ * Voice Quota DB-Layer
+ *
+ * Tracks daily TTS seconds per user. Quota resets automatically when the
+ * calendar day (UTC) changes since the last reset.
+ *
+ * Schema fields on `profiles`:
+ *   voice_seconds_used_today  INTEGER  NOT NULL DEFAULT 0
+ *   voice_quota_reset_at      TIMESTAMP
+ */
+import { usePrisma } from "../utils/prisma";
+import { getPlanLimits } from "../utils/plan-features";
+
+/** Midnight UTC for the current day (used as reset boundary). */
+function todayUtcMidnight(): Date {
+  const d = new Date();
+  d.setUTCHours(0, 0, 0, 0);
+  return d;
+}
+
+/**
+ * Returns remaining quota seconds for the user today.
+ * Automatically resets counter if last reset was before today (UTC).
+ * Returns Infinity when dailyQuotaSeconds === 0 (Legend unlimited).
+ */
+export async function getRemainingVoiceQuota(
+  userId: string,
+  plan: string,
+): Promise<number> {
+  const limits = getPlanLimits(plan);
+  const { dailyQuotaSeconds } = limits.voice;
+
+  // Unlimited plan — short-circuit
+  if (dailyQuotaSeconds === 0) return Infinity;
+
+  const db = usePrisma();
+  const midnight = todayUtcMidnight();
+
+  const profile = await db.profile.findUnique({
+    where: { id: userId },
+    select: {
+      voiceSecondsUsedToday: true,
+      voiceQuotaResetAt: true,
+    },
+  });
+
+  if (!profile) throw createError({ statusCode: 404, message: "Profil nicht gefunden" });
+
+  // Reset if no reset-stamp yet OR stamp is before today's midnight UTC
+  const needsReset =
+    !profile.voiceQuotaResetAt ||
+    profile.voiceQuotaResetAt < midnight;
+
+  if (needsReset) {
+    // Idempotent: even if two concurrent requests hit this, the result is the
+    // same full quota — no race condition risk here.
+    await db.profile.update({
+      where: { id: userId },
+      data: {
+        voiceSecondsUsedToday: 0,
+        voiceQuotaResetAt: midnight,
+      },
+    });
+    return dailyQuotaSeconds;
+  }
+
+  const used = profile.voiceSecondsUsedToday ?? 0;
+  return Math.max(0, dailyQuotaSeconds - used);
+}
+
+/**
+ * Increment the used-seconds counter. No-op for unlimited plans (Legend).
+ * Does NOT validate against quota — caller must check `getRemainingVoiceQuota`
+ * first.
+ */
+export async function consumeVoiceQuota(
+  userId: string,
+  plan: string,
+  seconds: number,
+): Promise<void> {
+  const limits = getPlanLimits(plan);
+  if (limits.voice.dailyQuotaSeconds === 0) return; // unlimited — no tracking needed
+
+  const db = usePrisma();
+  const midnight = todayUtcMidnight();
+
+  await db.profile.update({
+    where: { id: userId },
+    data: {
+      voiceSecondsUsedToday: { increment: Math.max(0, Math.round(seconds)) },
+      // Ensure reset-stamp is set (idempotent with getRemainingVoiceQuota reset)
+      voiceQuotaResetAt: midnight,
+    },
+  });
+}
+
+/**
+ * Estimate audio duration in seconds for a given text length.
+ * Rule of thumb: German TTS ~13 chars/sec at default speed.
+ * Minimum 1 second.
+ */
+export function estimateAudioSeconds(text: string): number {
+  return Math.max(1, Math.ceil(text.length / 13));
+}
diff --git a/backend/server/utils/plan-features.ts b/backend/server/utils/plan-features.ts
index bd7198d..176ad15 100644
--- a/backend/server/utils/plan-features.ts
+++ b/backend/server/utils/plan-features.ts
@@ -1,5 +1,18 @@
 export type Plan = "free" | "pro" | "legend";
 
+export type VoiceProvider = "elevenlabs" | "openai" | "google" | "cartesia" | "azure";
+
+export interface VoiceConfig {
+  /** TTS-Provider für diesen Plan */
+  provider: VoiceProvider;
+  /** Provider-spezifische Model-ID (optional) */
+  model?: string;
+  /** Provider-spezifische Voice-ID (optional — fällt auf provider-default zurück) */
+  voiceId?: string;
+  /** Tages-Quota in Sekunden. 0 = unlimited */
+  dailyQuotaSeconds: number;
+}
+
 export interface PlanLimits {
   /** Max. eigene Domains (Infinity = unbegrenzt) */
   customDomains: number;
@@ -25,6 +38,15 @@ export interface PlanLimits {
   aiModelFallbacks: Array<{ provider: "groq" | "openrouter"; model: string }>;
   /** AI-Provider: groq (Free/Pro) oder openrouter (Legend/Claude) */
   aiProvider: "groq" | "openrouter";
+  /**
+   * Voice-Config: welcher TTS-Provider + Quota.
+   *
+   * Provider-Mapping (Cost-Reference 2026-05):
+   *   Free   → Google TTS Neural2  (~$4/1M chars, 60s/day cap)
+   *   Pro    → Cartesia Sonic-2    (~$4/1M chars, 300s/day cap, ~75ms first-byte)
+   *   Legend → ElevenLabs Turbo v2.5 (~$30/1M chars, unlimited)
+   */
+  voice: VoiceConfig;
 }
 
 export const PLAN_LIMITS: Record<Plan, PlanLimits> = {
@@ -45,6 +67,11 @@ export const PLAN_LIMITS: Record<Plan, PlanLimits> = {
       { provider: "openrouter", model: "meta-llama/llama-3.1-8b-instruct" },
     ],
     aiProvider: "groq",
+    voice: {
+      provider: "google",
+      model: "de-DE-Neural2-F", // Google Cloud TTS Neural2 — natural, ~$4/1M chars
+      dailyQuotaSeconds: 60,    // 1 Minute/Tag
+    },
   },
   pro: {
     customDomains: 5,
@@ -62,6 +89,11 @@ export const PLAN_LIMITS: Record<Plan, PlanLimits> = {
       { provider: "openrouter", model: "meta-llama/llama-3.3-70b-instruct" },
     ],
     aiProvider: "groq",
+    voice: {
+      provider: "cartesia",
+      model: "sonic-2",         // Cartesia Sonic-2 — ~75ms TTFT, native German, ~$4/1M chars
+      dailyQuotaSeconds: 300,   // 5 Minuten/Tag
+    },
   },
   legend: {
     customDomains: 10,
@@ -79,6 +111,11 @@ export const PLAN_LIMITS: Record<Plan, PlanLimits> = {
       { provider: "groq", model: "llama-3.3-70b-versatile" },
     ],
     aiProvider: "openrouter",
+    voice: {
+      provider: "elevenlabs",
+      model: "eleven_turbo_v2_5", // ElevenLabs Turbo v2.5 — premium, ~$30/1M chars
+      dailyQuotaSeconds: 0,       // 0 = unlimited
+    },
   },
 };
 
diff --git a/backend/tests/voice/quota.test.ts b/backend/tests/voice/quota.test.ts
new file mode 100644
index 0000000..01e1075
--- /dev/null
+++ b/backend/tests/voice/quota.test.ts
@@ -0,0 +1,208 @@
+/**
+ * Tests for voice quota DB layer (server/db/voiceQuota.ts).
+ *
+ * Covers:
+ *   - Free: partial consumption → correct remaining
+ *   - Free: exhausted quota → 0 remaining
+ *   - Day-rollover: stale resetAt → auto-reset to plan default
+ *   - Legend: unlimited → consumeVoiceQuota is a no-op
+ *   - estimateAudioSeconds: basic sanity
+ */
+import { describe, expect, it, vi, beforeEach } from "vitest";
+
+// ─── Mocks ────────────────────────────────────────────────────────────────────
+
+const mocks = vi.hoisted(() => ({
+  profile: {
+    findUnique: vi.fn(),
+    update: vi.fn(),
+  },
+}));
+
+vi.mock("../../server/utils/prisma", () => ({
+  usePrisma: () => ({
+    profile: mocks.profile,
+  }),
+}));
+
+import {
+  getRemainingVoiceQuota,
+  consumeVoiceQuota,
+  estimateAudioSeconds,
+} from "../../server/db/voiceQuota";
+
+beforeEach(() => {
+  vi.clearAllMocks();
+  mocks.profile.update.mockResolvedValue({});
+});
+
+// ─── estimateAudioSeconds ─────────────────────────────────────────────────────
+
+describe("estimateAudioSeconds", () => {
+  it("returns at least 1 for empty/very short text", () => {
+    expect(estimateAudioSeconds("")).toBe(1);
+    expect(estimateAudioSeconds("Hi")).toBe(1);
+  });
+
+  it("estimates ~13 chars/sec", () => {
+    // 130 chars → ~10 sec
+    const text = "a".repeat(130);
+    expect(estimateAudioSeconds(text)).toBe(10);
+  });
+
+  it("rounds up", () => {
+    // 14 chars → ceil(14/13) = 2
+    const text = "a".repeat(14);
+    expect(estimateAudioSeconds(text)).toBe(2);
+  });
+});
+
+// ─── getRemainingVoiceQuota ───────────────────────────────────────────────────
+
+describe("getRemainingVoiceQuota — free plan (60s)", () => {
+  it("returns 30s remaining after 30s consumed (same day)", async () => {
+    const todayMidnight = new Date();
+    todayMidnight.setUTCHours(0, 0, 0, 0);
+
+    mocks.profile.findUnique.mockResolvedValueOnce({
+      voiceSecondsUsedToday: 30,
+      voiceQuotaResetAt: todayMidnight, // reset is today → no rollover
+    });
+
+    const remaining = await getRemainingVoiceQuota("user-1", "free");
+    expect(remaining).toBe(30); // 60 - 30
+    expect(mocks.profile.update).not.toHaveBeenCalled();
+  });
+
+  it("returns 0 when full 60s consumed", async () => {
+    const todayMidnight = new Date();
+    todayMidnight.setUTCHours(0, 0, 0, 0);
+
+    mocks.profile.findUnique.mockResolvedValueOnce({
+      voiceSecondsUsedToday: 60,
+      voiceQuotaResetAt: todayMidnight,
+    });
+
+    const remaining = await getRemainingVoiceQuota("user-1", "free");
+    expect(remaining).toBe(0);
+  });
+
+  it("clamps to 0 when over-consumed (no negative)", async () => {
+    const todayMidnight = new Date();
+    todayMidnight.setUTCHours(0, 0, 0, 0);
+
+    mocks.profile.findUnique.mockResolvedValueOnce({
+      voiceSecondsUsedToday: 999,
+      voiceQuotaResetAt: todayMidnight,
+    });
+
+    const remaining = await getRemainingVoiceQuota("user-1", "free");
+    expect(remaining).toBe(0);
+  });
+});
+
+describe("getRemainingVoiceQuota — day rollover", () => {
+  it("resets to full quota when resetAt is yesterday", async () => {
+    const yesterday = new Date();
+    yesterday.setUTCDate(yesterday.getUTCDate() - 1);
+    yesterday.setUTCHours(0, 0, 0, 0);
+
+    mocks.profile.findUnique.mockResolvedValueOnce({
+      voiceSecondsUsedToday: 60, // was fully consumed yesterday
+      voiceQuotaResetAt: yesterday,
+    });
+
+    const remaining = await getRemainingVoiceQuota("user-1", "free");
+    expect(remaining).toBe(60); // full plan quota after reset
+
+    // Should have reset the counter
+    expect(mocks.profile.update).toHaveBeenCalledWith(
+      expect.objectContaining({
+        where: { id: "user-1" },
+        data: expect.objectContaining({
+          voiceSecondsUsedToday: 0,
+        }),
+      }),
+    );
+  });
+
+  it("resets when voiceQuotaResetAt is null (first ever use)", async () => {
+    mocks.profile.findUnique.mockResolvedValueOnce({
+      voiceSecondsUsedToday: 0,
+      voiceQuotaResetAt: null,
+    });
+
+    const remaining = await getRemainingVoiceQuota("user-1", "pro");
+    expect(remaining).toBe(300); // full pro quota
+    expect(mocks.profile.update).toHaveBeenCalled();
+  });
+});
+
+// ─── getRemainingVoiceQuota — Legend (unlimited) ──────────────────────────────
+
+describe("getRemainingVoiceQuota — legend plan (unlimited)", () => {
+  it("returns Infinity without touching DB", async () => {
+    const remaining = await getRemainingVoiceQuota("user-legend", "legend");
+    expect(remaining).toBe(Infinity);
+    expect(mocks.profile.findUnique).not.toHaveBeenCalled();
+    expect(mocks.profile.update).not.toHaveBeenCalled();
+  });
+});
+
+// ─── consumeVoiceQuota ────────────────────────────────────────────────────────
+
+describe("consumeVoiceQuota", () => {
+  it("increments counter for free plan", async () => {
+    await consumeVoiceQuota("user-1", "free", 30);
+
+    expect(mocks.profile.update).toHaveBeenCalledWith(
+      expect.objectContaining({
+        where: { id: "user-1" },
+        data: expect.objectContaining({
+          voiceSecondsUsedToday: { increment: 30 },
+        }),
+      }),
+    );
+  });
+
+  it("increments counter for pro plan", async () => {
+    await consumeVoiceQuota("user-1", "pro", 45);
+
+    expect(mocks.profile.update).toHaveBeenCalledWith(
+      expect.objectContaining({
+        data: expect.objectContaining({
+          voiceSecondsUsedToday: { increment: 45 },
+        }),
+      }),
+    );
+  });
+
+  it("is a no-op for legend plan (unlimited)", async () => {
+    await consumeVoiceQuota("user-legend", "legend", 120);
+    expect(mocks.profile.update).not.toHaveBeenCalled();
+  });
+
+  it("rounds fractional seconds to whole number", async () => {
+    await consumeVoiceQuota("user-1", "free", 7.7);
+
+    expect(mocks.profile.update).toHaveBeenCalledWith(
+      expect.objectContaining({
+        data: expect.objectContaining({
+          voiceSecondsUsedToday: { increment: 8 }, // Math.round(7.7)
+        }),
+      }),
+    );
+  });
+
+  it("clamps negative seconds to 0", async () => {
+    await consumeVoiceQuota("user-1", "free", -5);
+
+    expect(mocks.profile.update).toHaveBeenCalledWith(
+      expect.objectContaining({
+        data: expect.objectContaining({
+          voiceSecondsUsedToday: { increment: 0 },
+        }),
+      }),
+    );
+  });
+});