WaterFast: IF Fasting Timer
16:8 Intermittent Fast Tracker
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
Your full fasting cycle, on autopilot: reach your goal, your fast is saved, the eating window starts counting — and closes itself. iPhone & Watch, always in sync.
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.
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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.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
• A full automatic cycle: reach your goal and your fast is saved, then your eating window begins — and when it ends, you're ready for the next one.
• Smoother, more reliable timer, with clear "End fast" and "Finish" actions in each phase.
• A cleaner, more minimalist design — polished for both light and dark mode.
• New gentle reminder to get back to fasting after a few days off.
• Fixes and performance improvements.
The developer, LUIS ORLANDO LAZO GONZALEZ, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- LUIS ORLANDO LAZO GONZALEZ
- Size
- 2.8 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
English and 4 more
- English, French, German, Japanese, Spanish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- WaterFast PRO Yearly $9.99
- WaterFast PRO Lifetime $24.99
- Copyright
- © 2026 Güije Studios
