Questions, bugs or feature requests: spacecatsstudios@gmail.com. Include your device, app version (shown in Settings) and what you expected to happen.
Progress is stored only on your device. Clearing browser or app data, or uninstalling, deletes it. Use Settings → Export to save a backup file, and Import to restore it on any device.
Open Settings → Premium → Restore purchases while signed in to the same Apple ID or Google account you used to buy. If it still fails, email us with your order ID from the store receipt.
iOS: Settings → your name → Subscriptions. Android: Play Store → profile → Payments & subscriptions → Subscriptions. Uninstalling does not cancel.
Check that notifications are allowed for Hanzi Practice in your device settings and that battery optimization is not restricting the app (Android).
Turn on Pen only in Settings. Finger input is then ignored on the writing grid.