Privacy Policy

Last updated April 2026

Data we collect

Zen Kana collects practice session data, vocabulary and grammar progress, and user preferences stored locally and, when signed in, synced via Firebase. Authentication data (email, name) is collected when you sign in with Google or Apple.

How we use your data

Your data is used solely to power the app's learning features: spaced repetition scheduling, progress tracking, and cross-device sync. We do not sell your data to third parties.

Analytics and crash reporting

With your consent, we collect anonymized usage analytics (Firebase Analytics) and crash reports (Firebase Crashlytics) to improve app quality. You can withdraw consent at any time in Settings → Privacy.

Data storage and security

Local data is stored in device storage (SharedPreferences on mobile, browser localStorage on web). Cloud sync uses Firebase Firestore with per-user security rules.

GDPR rights

If you are in the EU, you have the right to access, correct, or delete your data. Contact us at the email below and we will respond within 30 days.

Contact

For privacy questions or data deletion requests, email: [email protected]