Fasting Center. Track your fast, understand your body.

A simple, science-based fasting tracker. Free, no ads.

Android version coming soon…

A timer that shows more than time
The gradient ring tracks your fast in real time and marks each metabolic stage as you reach it, from digestion to fat burning and autophagy.

Know what's happening inside
Every stage explains the physiology behind it: insulin, glycogen, ketones, cellular repair.

Flexible fasting plans
From 12:12 to extended fasts. Pick a plan or set your own schedule.

Your progress, measured
Fasting history, weight, waist, and mood in clear charts, plus weight loss projections built on the extended fasting weight loss calculator.

Syncs with your health data
Weight and fasting data flow to and from Apple Health automatically.

Private by design
No ads, no data selling. Delete your account and data anytime.