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Privacy Policy (English)

Fritz (https://www.fritzdeutsch.com) is a German vocabulary learning app run by Fritz – Dein Deutschfreund (dự án cá nhân / individual project). This policy explains what Fritz collects, why, and your rights.

1. What Fritz stores

• Without an account: your learning progress and settings stay in your browser (localStorage) and are never sent to a server.
• Sign in with Google: Fritz receives your email address, name and profile picture (scopes openid email profile). Fritz does not request or access any other Google data such as Gmail, Drive, Calendar or Contacts.
• Sign in by email link: your email address and sign-in time.
• Learning progress (words learned, review schedule, streak, settings) is synced to our server so you can use several devices.
• Purchased plans (plan name, activation and expiry dates) to unlock content. Fritz never stores card or bank details; payment happens by bank transfer or e-wallet outside the app.
• Usage statistics: pages viewed, lessons completed and device type, tied to a random device id, used to improve the app. Vercel Analytics counts visits without tracking cookies.
• Email addresses you leave to receive free materials or a sign-in link.

Fritz stores no passwords and collects no location, contacts or sensitive data.

2. How it is used

Only to sign you in and recognise you; store and sync your progress; unlock purchased plans; send sign-in emails and materials you asked for; fix bugs and improve the app. Fritz does not sell, rent or share your data for advertising. Data received from Google is never used to train AI models.

3. Cookies and browser storage

• Session cookie (fritz_session): keeps you signed in for up to 90 days. Sign-in only, no tracking.
• Temporary cookie during Google sign-in (10 minutes) to prevent request forgery.
• localStorage: progress, interface language, the analytics device id and interface preferences. Clearing site data in your browser removes all of it.

4. Third-party services

• Vercel (USA) – hosting and visit statistics.
• Neon – database for accounts and progress.
• Resend – sign-in emails.
• Google – Sign in with Google. Fritz's use of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements.

These providers process data solely to run Fritz. Servers may be located outside your country.

5. Retention

Account and progress data are kept as long as your account exists. Email sign-in links expire after use or after a short time. Usage statistics are kept for at most 24 months.

6. Your rights

You can ask to access, correct, export or delete all of your data at any time by emailing anhtuanevt@gmail.com. Requests are handled within 30 days. Deleting your account removes your email, progress and purchased plans and cannot be undone. You can also revoke Fritz's access in your Google account permissions.

7. Children

Fritz is intended for people aged 13 and over. If you believe a child under 13 has created an account, email us and we will delete it.

8. Changes

When this policy changes materially, the date at the top is updated and a notice is shown in the app. Contact: anhtuanevt@gmail.com.

Kurzfassung auf Deutsch

Ohne Konto bleibt dein Lernfortschritt nur in deinem Browser. Mit Konto (Google oder E-Mail-Link) speichern wir E-Mail, Name, Profilbild und deinen Lernfortschritt, um ihn geräteübergreifend zu synchronisieren. Bei Google-Anmeldung nutzen wir nur die Scopes openid email profile, keine weiteren Google-Daten. Keine Passwörter, kein Verkauf von Daten, keine Werbung. Dienstleister: Vercel, Neon, Resend, Google. Session-Cookie bis zu 90 Tage. Auskunft, Export oder Löschung innerhalb von 30 Tagen: anhtuanevt@gmail.com.