Fast
Fast
An intermittent fasting timer with an on-device coach. It reads your sleep, HRV, and weight from Health, and quietly adjusts the window — so you fast when your body is ready, not when an algorithm wants to look impressive.
No streak shaming, no body photos, no supplement affiliates, no sales of your data. The coach runs entirely on your phone — there's no LLM call.
16:8, 18:6, 20:4, OMAD, and 5:2. Pick a default in onboarding; the coach adapts day-to-day from there.
Reads sleep, HRV, body mass, and activity from Health. Suggests a gentler window after a poor night, a small push when recovery is strong.
Clean Slate → Fat Burn → Autophagy → Ketosis. Subtle local notifications when you cross each one — no lock-screen nags.
One hour before your window opens, a short card tailored to your goal (fat loss, metabolic health, or discipline).
Adherence grid, weight trend, a one-paragraph coach note. No social comparison, no shaming.
No analytics SDK, no LLM call, no server. Your fasting data stays on your phone unless you turn on iCloud sync.
16:8 is the best default. The coach reads your sleep and adjusts to a gentler window when your body asks for it.
One tap on the home ring. A subtle phase chip shows where you are. Water + electrolyte buttons live one row down.
One hour before the window opens, you'll get a short card with what to break with and what to avoid — calibrated to your goal.
The free tier is the real 16:8 timer with the coach line. Pro unlocks the full protocol set and HealthKit-driven daily adaptation.