Privacy Policy

Last updated: 2025-09-17

Duolibro helps language learners read AI-generated short stories side-by-side in their native and target languages. We value your privacy and design features to minimize data collection.

Data We Collect

• Account Data: Email, display name, auth provider IDs (Google/Apple). Stored in Firebase Authentication.
• Generated Content: Story prompts and resulting AI stories stored in Firestore/Cloud Storage for your access.
• Usage Metadata: Timestamps (created, opened), story progress percentage, and review ratings.
• Purchase Records: Credit pack purchases (Stripe session IDs, ledger entries) for auditing and fraud prevention.

What We Don’t Collect

• No third‑party ad tracking pixels.
• No selling of personal data.
• No keystroke logging or invasive analytics.

How We Use Data

• Generate and personalize bilingual stories.
• Maintain your credit balance and purchase history.
• Display reviews and moderate abuse reports.
• Improve generation quality (aggregated, anonymized prompt patterns).

Storage & Security

All data stored in Google Firebase (EU/US regions) with security rules restricting reads/writes to authenticated owners. Service accounts perform server writes for generation jobs.

Third Parties

• OpenAI: Prompts and model outputs processed to generate stories and images.
• Stripe: Processes payments; we never see full card numbers.
• Apple / Google: For optional single sign-on and mobile in-app purchases.

Retention

• Stories & prompts: retained until you delete your account or remove individual stories (feature roadmap).
• Ledger/purchase entries: retained for financial compliance (min 7 years).

Your Rights

• Access and export (roadmap).
• Deletion on request (see Data Deletion).
• Revoke access by removing third-party sign-ins.

Cookies

Only essential session/auth cookies from Firebase and Stripe Checkout.

Children

Not directed to children under 13. If a child’s data is discovered we will delete it.

Contact

Email: privacy@duolibro.app