WaterFast is the intermittent fasting timer built Watch-first: start, track and end your fast from your wrist — the iPhone always shows exactly the same timer. Fasting zones, hydration and streaks. Nothing else.
No accounts, no setup, no filler.
Pick any plan and start the fast from your iPhone or your Watch. Try it all free for 3 days.
Follow your progress through science-based fasting zones — from fat burning to autophagy.
End the fast, keep your streak alive and watch the calendar fill up.
Everything a fasting timer needs — and the Watch app the competition never got right.
Start and end fasts from the Watch, even with the iPhone in your pocket. One shared timer, zero drift.
Know what is happening in your body: digestion, fat burning, ketosis, autophagy — hour by hour.
Log a glass of water with one tap on your wrist, with haptic confirmation. Synced to Apple Health.
Do not break the chain: a calendar of completed fasts, your current streak and your best one.
16:8, 18:6, 20:4, OMAD, 5:2, or fully custom hours.
No ads, no tracking, no account. Your data stays on your device and in Apple Health.
Zero charges $69.99/year for a fasting timer. WaterFast is a fraction of that — and every plan starts with a 3-day free trial. You decide.
Güije Studios has no servers and no databases. WaterFast stores your fasts and hydration only on your iPhone and, if you allow it, in Apple Health (HealthKit). No ads, no tracking, no account.