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Privacy Policy for Vokki

Last updated: April 26, 2026

1. Introduction

Vokki (hereinafter — the "App") is a mobile application for learning German. We respect your privacy and strive to protect your personal data. This Privacy Policy explains what data we collect, how we use it, and how we store it.

2. What data we collect

  • Learning progress — stories read, words learned, training results.
  • App settings — interface language, theme, daily goal.
  • Anonymous usage analytics — screen views, feature usage, session duration. No personal data is included.

If you sign in with Apple or Google:

  • Email address (for account identification).
  • Name and profile photo (if provided by the auth provider).

Without signing in, all data is stored locally on the device only.

3. How we use your data

Collected data is used exclusively for:

  • Ensuring the app works and preserving your progress.
  • Improving the quality of the app.

4. Data storage

Without an account, all data is stored locally on the device.

If you sign in, your learning progress is synced with our server (Supabase, hosted in Germany). This allows you to restore progress on another device. You can delete your account and all server data at any time through settings.

5. Third-party services

  • Apple Sign In / Google Sign In — for authentication (only by your choice).
  • Supabase (self-hosted) — for cloud sync of authorized users' progress. Server is located in Germany.
  • PostHog (EU) — for anonymous product analytics (screen views, feature usage). Analytics is always active and cannot be disabled. Data is stored on servers in the EU (Frankfurt). No personal data is collected.
  • Sentry (EU) — for crash and error reports. See "Crash reporting and diagnostics" section.
  • RevenueCat (US) — for subscription management. See "Subscriptions and payments" section.
  • Cloudflare R2 (CDN) — for streaming and downloading audio materials. No personal data is transmitted.
  • Firebase Cloud Messaging — for delivering push notifications (only if enabled by you).

App stores (App Store, Google Play) may collect anonymous analytics according to their own policies.

6. Push notifications

If you enable push notifications, we collect:

  • Device token (Firebase Cloud Messaging) — to deliver notifications to your device.
  • Timezone — to send reminders at appropriate local times.
  • Notification preferences — which types of reminders you enabled.

We use this data exclusively to send learning reminders and streak alerts. Google Firebase Cloud Messaging is used as a transport layer only.

All notification data is deleted when you delete your account.

7. Crash reporting and diagnostics

To improve app stability we use Sentry to collect crash and error reports:

  • Error type, stack trace, and app version.
  • Device model, OS version, and interface language.
  • Anonymous session identifier (no email or name).

We do not send the contents of your dictionaries, notes, learning progress, or personal data to Sentry. Data is processed by Sentry GmbH (EU, Germany) and stored for no more than 90 days.

Reports help us quickly find and fix errors you may have encountered in the app.

8. Subscriptions and payments

Vokki offers paid subscriptions (Starter, Pro, Ultra). Payments are processed by the App Store (Apple) or Google Play — we do not receive or store your bank card data.

For subscription management we use RevenueCat (US). RevenueCat receives:

  • Anonymous app user identifier.
  • Purchase identifier and tier (Starter / Pro / Ultra).
  • Subscription status (active, cancelled, expired).

This data is needed to unlock paid features across all your devices and to restore purchases. Email and name are not transmitted to RevenueCat.

You can cancel your subscription at any time via App Store or Google Play settings. After the paid period ends, access to paid features is revoked, but all your learning data is preserved.

9. Your rights

You have the right to:

  • Know what data is stored.
  • Delete your data — delete your account through settings or uninstall the app.
  • Contact us with any privacy-related questions.

10. Contact

For privacy-related questions, contact us at: support@vokki.me