TrustFast for iPhone and Apple Watch
Intermittent fasting that fits your life
The intermittent fasting timer you can trust: start free, get an alert when your window ends, and keep your history whether or not you pay.
Free to start · No account
No account
No guilt
No streaks
A plan that fits you
Set it up once. Then forget about it.
Start with what feels doable
12:12, 14:10 or 16:8. You can change it any time.
At a time that works
When does your fast start? The end follows from your length.
On days that suit you
Every day, weekdays, weekends, or your own mix. Each fast belongs to the day it starts.
Right on time
Stop watching the clock
Choose your alerts: when your window starts, part-way through, and when it ends. They ring like alarms, even on silent.
Never missa start or an end
You’ll hear it
You’ll feel it
Overnight
One glance is all it takes
The time your window ends is the biggest thing on the screen. How long you’ve fasted and how long is left sit right under it.
You sleep. It counts.
Everything runs on your iPhone, offline. No account, no server, nothing to sync. Your fast simply keeps going.
Roam free
Leave your phone behind
Start, check and end your fast from your Apple Watch, without reaching for your phone. When the two meet again, each knows what the other did.
Phone at home? Fine
Your watch is enough
Life happens
Early lunch? No problem.
Started late, want to go longer, need to stop early? Edit the start or the end, end early, or skip tonight. Nothing to make up, nothing to break.
Well done!
Always know when you can eat
At noon your alert rings: eat window open. Until then, your Lock Screen and the Dynamic Island keep the countdown in view.
At your pace
Take a day off. Nothing breaks.
Went longer, ended early, skipped a night: every fast still counts, and nothing resets.
See how you’ve been doing
Each day is a dot. Full for a fast, plus for one that went longer, half for one ended early, open for a day off.
Watch your year add up
A year of fasting looks like a year of life: mostly on plan, sometimes not, and all of it kept.
Free to fast. Plus to look back.
Everything you need to finish a window is free, for good. Plus is for looking further back.
Free always
- Start, end and edit fasts, on iPhone and Apple Watch
- Your schedule, and one-off fasts whenever you like
- Start, part-way and end alerts
- Widgets, the Live Activity, and a Start Fast shortcut for Siri
- Your last 7 days of history
TrustFast Plus subscription
- Your whole history, past the last 7 days
- Month and year stats on how you’ve been doing
- A 14-day free trial on the yearly plan, starting only when you choose it
If a trial ends or you cancel, nothing is deleted: older days stay visible and locked, and starting a fast is always free. Cancel in the App Store like any subscription; prices are shown there and in the app before you subscribe.
Your fasts stay on your devices
- No account, no sign-in.
- No ads, no tracking. Anonymous usage counts only.
- Alerts are scheduled on your iPhone, not sent from a server.
- Payments go through Apple. We never see them.
Start your first fast whenever you like, on schedule or not.
iPhone with iOS 26 or later · Apple Watch with watchOS 26, optional