Great app
La uso para bajar de peso, muy buena app, justo lo que necesitaba
Free
In-App Purchases
About
This app provides a synchronized intermittent fasting timer designed for seamless use across your iPhone and Apple Watch. It offers detailed insights into fasting zones and hydration tracking, with a focus on privacy and a user-friendly experience.
✓Synchronized iPhone and Apple Watch timer
✓Fasting zone insights
✓Hydration tracking
✓Multiple fasting plans
✓Streak calendar
✓Data export
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What's New in WaterFast
1.0.4
July 24, 2026
Your fasting cycle now runs on autopilot: • Reach your goal (e.g. 16h) and your fast is saved automatically — with a notification that you can eat. • The eating window starts counting from 0 (in green), so you always know how long you have left to eat. • When the window closes, the cycle ends by itself and you get a reminder to start your next fast. • Works for every plan: 16:8, 18:6, 20:4, OMAD, 5:2 and custom — on iPhone, Apple Watch, widgets and complications. Also: reliable start/end from Apple Watch, redeem promo codes in the app, and visual fixes.
MoreSubscription plans
WaterFast PRO Yearly
Full PRO access.
$9.991 Year
1
In-App Purchases
$24.99
WaterFast PRO Lifetime
Full PRO access forever. One payment.
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FAQ
Does WaterFast have ads?
No, WaterFast is ad-free. The app emphasizes privacy and does not include advertisements.
What are the pricing options for WaterFast PRO?
WaterFast PRO is available for $9.99 per year with a 7-day free trial, or as a lifetime purchase for $24.99. There are no monthly fees.
How does WaterFast sync with Apple Watch?
WaterFast is built with Apple Watch as the primary device. The timer state is shared, ensuring your iPhone and Watch timers remain synchronized to the second, even when your phone is not actively being used.
What fasting plans does WaterFast offer?
The free version includes the 16:8 fasting plan. WaterFast PRO unlocks additional plans such as 18:6, 20:4, OMAD, 5:2, and fully custom plans.
Can I track my hydration with WaterFast?
Yes, WaterFast includes hydration tracking. You can log water intake with a single tap on your Apple Watch, and this data syncs instantly to your iPhone and Apple Health.
What are fasting zones in WaterFast?
Fasting zones provide insights into what is happening in your body during a fast, including digestion, fat burning, ketosis, and autophagy. Each zone is explained with science-based hour ranges for educational purposes.
Is my data private with WaterFast?
Yes, WaterFast is designed for privacy. It requires no account, no ads, and no tracking. Your fasting and hydration data remains on your device unless you choose to sync it with Apple Health.
How often is WaterFast updated?
The app was last updated on July 15, 2026, with version 1.0.1. This indicates active development and maintenance.