How can we help?

iOS and Android. Ntervals needs iOS 16.4 or Android 7; Fastn needs iOS 17 or Android 8.

No. There is nothing to sign up for. Both apps open straight to the main screen and everything works offline.

Yes. Timers, history, streaks and content all work offline. The only things that need a connection are the initial purchase and, in Fastn, optional cloud backup and the feed of recent studies on Discover.

By default your data lives only on your device. Fastn can optionally export a backup to your own iCloud Drive or Google Drive, and offers a “Restore” option after a reinstall. Ntervals provides a manual export/import in its settings.

Check three things: device Settings → the app → Notifications are enabled; the in-app notification toggles are on; and Focus / Do Not Disturb isn’t silencing them. If they still don’t arrive, email us with your device model and OS version.

Email us with your device model and OS version, what you were doing when it happened, and a screenshot or screen recording if you can. We read every report and reply as soon as we can.

Subscriptions are managed by Apple or Google, not by LRM Labs. iOS: Settings → your name → Subscriptions → the app → Cancel. Android: Google Play → Subscriptions → the app → Cancel. Access stays active until the end of the current period.

If a trial is offered, it starts when you subscribe and converts to a paid period unless you cancel before it ends. Any unused portion is forfeited if you buy a plan that includes the trial.

Refunds are handled by the store, not by LRM Labs. iOS: use Apple’s “Report a Problem” page (reportaproblem.apple.com). Android: use the Google Play refund process, or contact Google support. EU and UK users may have additional withdrawal rights, handled through the same flows.

Tap “Restore purchases” in the app’s settings or on the paywall, signed in to the same Apple ID or Google account you bought with. It comes back instantly.

As little as possible. There is no account and no LRM Labs server; your content stays on your device. The only third party is the subscription provider (RevenueCat), used to process purchases. No advertising, no analytics SDK, no tracking. Full detail is in the Privacy Policy.

Because data lives on your device, deleting the app removes all of its data. Both apps also have a reset option in settings — export a backup first if you might want it later. For anything a subscription provider may hold, email us and we will complete deletion within 30 days.

Fasting is generally well-tolerated by healthy adults, but it isn’t right for everyone. Always consult a qualified healthcare professional before starting — especially if you are pregnant, breastfeeding, diabetic, taking medication, have a history of eating disorders, or are under 18. Fastn is not a medical device and does not provide medical advice; see the Terms of Use for the full disclaimer.

Open the protocol picker and choose a different preset, or build a custom fasting/eating window. You can change protocols even mid-fast, though finishing the current one first keeps streak tracking cleaner.

Fed, Fat Burn, Ketosis, Autophagy and Deep Ketosis. Each has a short, science-backed explanation of what your body is doing at that point in a fast.