WaterFast: IF Fasting Timer

Start and stop fasts from your Apple Watch — always in sync with iPhone. Reach your goal and see exactly when your eating window opens and closes.

FASTING APPS HAVE A PROBLEM They're either overpriced, bloated with social feeds and AI coaching you never asked for — or they're simple but their Apple Watch app runs a separate countdown that drifts out of sync with your iPhone. You end up with two different timers for the same fast. Not optimal at all.

WATERFAST IS DIFFERENT One timer. One source of truth. Your Watch doesn't follow your iPhone — it leads. Start, monitor and end your fast right from your wrist, even when your iPhone is in your pocket. When you pick it up, everything matches. Always. To the second.

FREE FOREVER

• 16:8 fasting plan — the most popular protocol
• Live fasting timer with progress ring
• Start & stop fasts from Apple Watch
• Basic Watch complication
• Hydration tracking with quick-add
• 7-day fasting history
• No account required

WATERFAST PRO

• All fasting plans: 18:6, 20:4, OMAD, 5:2 and fully custom
• Streak calendar — don't break the chain, unlimited history
• All Apple Watch complications (circular, corner, inline, rectangular)
• Advanced hydration tracking with daily goal
• Detailed fasting zone insights
• Full stats: current streak, longest fast, total hours, success rate
• Export your data as CSV

BUILT FOR APPLE WATCH — REALLY Most fasting apps treat the Watch as an afterthought. WaterFast was designed wrist-first. The timer state lives in one shared place: start a fast on your Watch during dinner, check the zone on your iPhone the next morning — same fast, same seconds, zero drift. Your complication updates every minute while you fast.

KNOW YOUR FASTING ZONES Track exactly what's happening in your body — from digestion through fat burning and ketosis to autophagy. Each zone explained in plain language, with science-based hour ranges. Educational reference only — not medical advice.

HYDRATION, ON YOUR WRIST Every fasting app tracks water. Only WaterFast lets you log a glass with one tap on your Watch, with haptic confirmation, synced instantly to your iPhone and Apple Health.

A PRICE THAT RESPECTS YOU WaterFast PRO: $9.99/year (7-day free trial) or $24.99 lifetime — one payment, forever. No monthly fees. Ever. We think a fasting timer shouldn't cost more than your streaming service.

PRIVATE BY DESIGN No account. No ads. No tracking. Your fasting and hydration data never leaves your device (except to your own Apple Health, if you choose).

Other apps charge $69.99/year for a fasting timer. WaterFast charges $9.99. Same core features. You decide.

Download free. Start your first 16:8 fast in 10 seconds.

Medical disclaimer: WaterFast provides educational information about fasting. It is not medical advice. Consult your healthcare provider before starting any fasting protocol, especially if you have a medical condition, are pregnant, or take medication.

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