CoreFasting that fits your days
A calm intermittent fasting tracker. Your fast at a glance, plans that explain themselves, and your history kept on your phone. No account, no ads, no tracking.
Requires iOS 16.4 or later · Android 8.0 or later
Free, with no in-app purchases.
Everything a fast needs, nothing it doesn't
Calm by design: no streak shaming, no rankings, no targets on food.
A live timer, at a glance
Pick a plan, tap Start, and see where your fast is. Ending early is recorded neutrally, never as a failure.
From 12:12 to OMAD
Daily plans including 16:8 and 18:6, plus 5:2, alternate-day, sunrise to sunset and your own hours. Each plan explains what a day looks like.
Your own daily goal
One-tap logging from Today, widgets, the watch or Siri, with gentle reminders only if you want them.
Calories as a description
Log meals in your eating window, scan a barcode, see protein, carbs and fat. Never a goal or a budget. Off with one switch.
Readings next to your fasts
Connect Apple Health or Health Connect for sleep, steps, heart rate, HRV and glucose. CoreFast only reads.
Widgets, watch and Siri
Home and Lock Screen widgets, a Live Activity, an Apple Watch app, Siri, Shortcuts, Controls and an Android Quick Settings tile.
Fast with a few friends
Fast alongside a few people you trust. Everything is encrypted before it leaves your phone.
Help when it gets hard
A breathing pause, water, and when it's okay to stop. One tap a day for how you feel.
Yours to keep or delete
Back up to a file you keep, export a spreadsheet, or delete everything, any time.
Also in CoreFast (10 more)
- Dawn (Fajr) start In Sunrise to sunset, begin at dawn by your calculation method.
- Auto-start Starts the next fast when your eating window closes. Daily plans only.
- Reminders A soft chime at your goal, and other nudges you choose.
- Tags and notes Busy day, Poor sleep and more, then filter History by them.
- Weight Optional, next to your fasts, from your health app.
- Share this week A picture of your week, shared only when you tap Share.
- Edit Today Choose which cards show on Today, and their order.
- Light and dark Follow your phone, or choose one.
- Seasons and weather The season on Today, or today's sky and temperature.
- App shortcuts Start fast, End fast and Log water from the CoreFast icon.
A look inside
Private by design
Your fasting history, water and health readings stay on your phone, stored encrypted. There's no account to make and nothing to sign in to.
- No account, ads, analytics or tracking.
- Health data is read on the phone and never leaves it.
- Circles are optional and end-to-end encrypted; you choose what each circle sees.
- Local weather is off until you turn it on: an approximate location only.
- Back up or delete everything yourself, any time.
Try CoreFast
Free, private, and calm from the first fast.
Requires iOS 16.4 or later · Android 8.0 or later