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Open the app and tap Start — that's it. The ring starts filling and your current fasting zone updates as the hours pass. When you reach your goal (or whenever you decide to stop), tap End Fast and the session is saved to your history. If you want to abandon a fast without saving it, use Cancel instead.

When no fast is running, the plan picker is right on the Home tab — choose 13:11, 14:10, 16:8, 18:6, 20:4 or OMAD. You can also change it in Settings. With Pro you can create a fully custom plan anywhere from 4 to 48 hours.

Yes. While a fast is running, tap the start time to edit it — you can move it back up to 7 days. Your zones, progress and notifications all update to match, so a forgotten tap never ruins a real fast.

Zones describe the metabolic stages your body moves through during a fast: Anabolic (0–4h), Catabolic (4–12h), Fat Burning (12–18h), Ketosis (18–24h) and Deep Ketosis (24h+). Tap the zone chip in the app for a plain-English explanation of each stage. Keep in mind the hour marks are general estimates — actual timing varies from person to person, and the app can't measure your real metabolic state.

It's automatic — starting a fast starts a Live Activity showing your elapsed time, progress and current zone. If you don't see it, check iOS Settings ▸ Super Fasting Tracker ▸ Live Activities is turned on. On iPhone 14 Pro and later, the timer also appears in the Dynamic Island.

Touch and hold your Home Screen, tap Edit ▸ Add Widget, and search for Super Fasting Tracker. The small widget is interactive — you can start a fast or mark it complete right from the widget. Lock Screen widgets are added by touching and holding the Lock Screen ▸ Customize. On iOS 18 you can also add a start/end toggle to Control Center.

Yes. The app includes App Shortcuts, so you can say things like "Start Fast", "End Fast", "Fasting Status" or "Log Water" with Siri, and build your own automations in the Shortcuts app.

Connect Apple Health from the Body tab (for weight) or the water sheet (for water). Weight syncs both ways — entries you add in other apps appear in your chart, and your logs are written back to Health. Water you log is saved to Health too. You control the permissions at all times in Health app ▸ Sharing ▸ Apps, and the app works fully without Health if you prefer.

Life happens — a streak freeze automatically protects your streak for a missed day. You start with one, earn another every 5 completed fasts, and can hold up to 2 at a time. Days saved by a freeze show a ❄️ snowflake on your calendar.

Pro unlocks custom fasting plans (4–48 hours), mood & notes on every completed fast, your full history (the free app shows the last 30 days), and CSV export of fasts, weights and water. The core timer is free forever — starting a fast is never locked or limited. Pro is available as a weekly subscription (with a free trial when offered), a yearly subscription, or a one-time lifetime purchase. See the subscription terms.

Go to Settings ▸ Apple ID ▸ Subscriptions ▸ Super Fasting Tracker ▸ Cancel. To avoid being charged when a free trial ends, cancel at least 24 hours before the trial period ends. Cancelling keeps Pro active until the end of the period you've paid for.

Open the app and tap Restore Purchases in Settings or on the Pro screen. Make sure you're signed in with the same Apple ID you originally used — this works for both subscriptions and the lifetime purchase.

Your fasting history, weight and water logs live on your device — there's no account and we never see your data. That also means deleting the app deletes your history, so think twice before removing it. With Pro you can export everything as CSV files for safekeeping. Seamless iCloud sync is on our roadmap.

Check these in order: iOS Settings ▸ Notifications ▸ Super Fasting Tracker is allowed; Live Activities is enabled in the app's iOS settings page; no Focus mode is silencing the app; and the notification toggles inside the app's own Settings are on. Very long fasts can also pause a Live Activity — opening the app refreshes it. Still stuck? Email us.

That's a question for your doctor, not an app. Super Fasting Tracker is a wellness tool — it doesn't provide medical advice, and fasting isn't appropriate for everyone. Please talk to a physician first, especially if you're pregnant or breastfeeding, under 18, have diabetes or blood-sugar issues, low blood pressure, a history of eating disorders, or take medication. Stop fasting and seek medical advice if you feel unwell. See our full health disclaimer.