For iPhone
Fasting Coach
A calmer way to fast. A coach who knows when to speak and when to stay quiet.
Powered by on-device AI. Private by default.
Download on theApp Store
Free. iOS 17 and later.
For iPhone
A calmer way to fast. A coach who knows when to speak and when to stay quiet.
Powered by on-device AI. Private by default.
Always in view
Elapsed time, time left and one calm line, without opening the app. When you reach your goal, it says well done and steps aside.
✓14h 37m1h 23m leftAn AI coach, on your iPhone
Type or talk. The coach answers with what is true about your fast and one small thing that helps. It never counts a hard day against you, and it stops coaching the moment you say you feel unwell.
Requires an iPhone with Apple Intelligence turned on. Without it, fasting tracking, the Live Activity and chat still work.
Progress that feels peaceful
A fast that fell short shows as what it was, most of the way there. Weeks, months and your longest fast, with no streak to lose and nothing to make up.
Private by design
Coaching, chat and voice are handled by Apple Intelligence on the device. Your fasts, settings and conversations never leave your phone. There is nothing to sign up for and nothing to delete later.
How your coach thinks
Every promise is written into the app, and you can read them all on your phone.
Until you do, it times messages around when you seem to be asleep. Tell it when not to message you, and it keeps to it.
Milestones and anything you ask for are extra, but never more than eight messages in a day.
Stopping when you choose is always okay.
A message only says "halfway" when you really are.
When a fast felt rough, it softens its tone and never suggests a longer one.
If you mention feeling faint or unwell, it stops coaching and asks you to eat.
Support
Email srinivas@rowdur.com with questions, feedback or problems. It helps to include your iPhone model and iOS version. I aim to reply within a few days.
Privacy Policy: PRIVACY.md
No. Your fasts, settings and coaching all stay on your iPhone. There are no accounts, no analytics and no servers. See the Privacy Policy.
The coach uses Apple Intelligence, so it needs an iPhone that supports it, with Apple Intelligence turned on in Settings. Without it, fasting tracking, the Live Activity and chat still work, but the coach won't send its own nudges. Also check that notifications are allowed for Fasting Coach in Settings → Notifications. The coach stays quiet during your quiet hours.
Hours fasting : hours eating. 16:8 means a 16-hour fast. To change your plan, tap your plan in Profile, or use − and + to set a custom length.
If you turn it on, it reads steps, active energy, sleep and workouts so the coach can match your day. It only reads your Health data and never writes to it. You can turn this off anytime in Settings → Privacy & Security → Health → Fasting Coach.
Yes. Try "Check my fast in Fasting Coach" or "When can I eat in Fasting Coach". You'll find all the shortcuts in the Shortcuts app.
Tap Start over at the bottom of Profile. It erases everything, and so does deleting the app.
No. Fasting Coach offers lifestyle support, not medical advice. Talk to a doctor before fasting if you are pregnant or breastfeeding, have diabetes or take blood-sugar medication, have a history of eating disorders, take prescription medication, or are under 18. Stop fasting and seek help if you feel unwell.
Privacy policy
Effective date: 28 September 2026
Fasting Coach is designed so that your data never leaves your iPhone. This policy explains what the app handles and why. The short version: we collect nothing.
All of this lives in local storage on your iPhone. It is never uploaded, synced, or shared. Deleting the app deletes it. "Start over" in Profile also erases it.
If you enable Health integration, Fasting Coach reads steps, active energy, sleep, and workouts from Apple Health on your device, read-only, solely so coaching can reflect your day. Health data is never written back, never transmitted anywhere, and is not used for any purpose other than the coaching shown to you. You can revoke access anytime in Settings → Privacy & Security → Health.
Coaching decisions and messages are generated by Apple's on-device Foundation Models. Prompts and responses are processed locally on your iPhone.
If a future version offers optional cloud reasoning via Apple's Private Cloud Compute, it will be off by default, clearly labelled in Profile, and used only with your explicit permission. Private Cloud Compute is designed by Apple so that data is not stored or made accessible to Apple.
The voice coach uses the microphone only while you hold a conversation, and speech is transcribed on-device by Apple's speech frameworks. No audio or transcripts leave your iPhone.
Coaching reminders are local notifications scheduled on your device. You control them through iOS notification settings and the app's own quiet hours and message limits.
Fasting Coach is not directed at children. Fasting is not appropriate for children; consult a doctor for any minor's dietary decisions.
Fasting Coach offers lifestyle support, not medical advice, diagnosis, or treatment. Consult a qualified professional before making fasting decisions that affect your health, and stop fasting if you feel unwell.
If this policy changes, the updated version will be published at the same URL with a new effective date. Questions: open an issue on the Fasting Coach GitHub repository or contact srinivas@rowdur.com.