21 Days — Privacy Policy

Last updated: June 2026

Data we collect

Email and display name from sign-in; habits you create (name, description, emoji, category); and daily check-ins (done / rest / missed) within each 21-day challenge.

Storage

Credentials are stored in SecureStore (iOS Keychain / Android Keystore). Habit data is always stored on your device for offline use. Cloud sync runs only when you have an active Premium subscription and turn on the "Cloud sync" switch in Settings (off by default).

Data retention

On-device data is kept until you delete your account or uninstall the app.

Server data (when Premium cloud sync is enabled) is kept until you delete your account.

When you delete your account in the app, data on your device and on our server is removed immediately.

Sharing with third parties

We do not sell, trade, or transfer your personal data to third parties. Services we use: PocketBase (self-hosted, for cloud sync), RevenueCat (subscriptions), and Apple/Google (OAuth sign-in and in-app purchases).

Sharing

Success share cards are created on your device only. Images are not uploaded to our servers automatically.

Notifications

The app uses on-device notifications for morning and evening check-in reminders. You can turn them off in system settings.

Your rights (GDPR / PDPA)

You can delete your account and related data from Settings > Delete account permanently. Deletion is permanent and cannot be undone.

Contact

For privacy questions, contact evertree-dev@proton.me

Support · Apple Standard EULA (iOS) · Google Play Terms (Android)