Subscriptions are tied to your App Store account. If Premium doesn't appear after reinstalling or switching devices, open Profile → Premium → Restore purchases. Make sure you are signed in with the same Apple ID you used to subscribe.

Yes. MyGrain works fully without an account: your entries are kept in an anonymous session on your device. If you create an account later, all your data is merged into it automatically.

Install MyGrain and sign in with the same account you used before. Your migraine history syncs from the cloud automatically (data recovery on new devices requires an account, and advanced sync is a Premium feature).

Check that notifications are allowed for MyGrain in your phone's settings, and that the reminder is enabled inside the app (Profile → Notifications). Focus modes and battery savers can also silence notifications.

If you enable weather correlation, MyGrain looks up weather conditions for the city set in your profile and relates them to your episodes. This does not use your device's location — only the city you enter — and you can disable it at any time.

Subscriptions are managed by Apple: open Settings → your name → Subscriptions on your iPhone and select My Grain Premium. Payment renews automatically unless cancelled at least 24 hours before the end of the current period.

You can permanently delete all your data at any time from Profile → Settings → Delete account. This removes your migraine history, treatments, habits and feedback from our servers, as required by the GDPR. See the privacy policy for details.

No. Your data is stored securely, is never sold and is never used for advertising; the only companies that handle it are the service providers that run the app, such as Google Firebase. Read the full privacy policy.