21 Days — Privacy Policy

Last updated: October 2026

Data we collect

No account or sign-in is required. The only data stored is what you create inside the app: your nickname, habit names, descriptions, emojis, categories, reminder times, and daily check-ins (done / rest) within each 21-day challenge.

Storage

All habit data is stored on your device only, including the data your Home Screen widgets display. Habit data is never sent to a server.

Data retention

Data is kept on your device until you erase it or uninstall the app. Tapping Settings > Erase all data deletes all local data immediately.

Sharing with third parties

We do not sell, trade, or transfer your personal data to third parties. Service we use: RevenueCat (Premium subscription management and in-app purchases via the App Store).

To check your Premium status, the app sends RevenueCat a random ID created for this install and your App Store purchase history. This ID is not linked to your name, email or habit data, and is not used to track you across other apps or websites. See RevenueCat's privacy policy.

Sharing

Share cards are created on your device. An image only leaves your device when you choose to share it.

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 erase all your data from Settings > Erase all data. Deletion is permanent and cannot be undone. To ask for the purchase records RevenueCat holds to be deleted, email us at the address below.

Contact

For privacy questions, contact [email protected]

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