iFast: Fasting Tracker

iFast puts your fasting journey right where you need it — on your iPhone, Apple Watch, and home screen widgets.

Start a fast with a single tap and watch your progress come alive through a beautiful gradient ring that tracks every phase of your metabolic journey. From the initial metabolic switch to deep ketosis and peak autophagy, iFast shows you exactly what's happening inside your body and why it matters.

YOUR FAST, EVERYWHERE

Glance at your Apple Watch to see your progress ring and current phase without pulling out your phone. Add home screen widgets in small, medium, or large sizes to keep your fasting status visible all day. Everything stays in sync automatically.

SCIENCE-BACKED PHASES

iFast maps your fast against 8 research-backed metabolic phases, each with detailed explanations of what's happening in your body:

- Glycogen Mobilization
- Fat Burning
- Ketosis Rising
- Deep Ketosis
- Peak Autophagy
- Immune Reset
- Deep Renewal

Every phase includes the science behind it, so you understand the real benefits of each hour you fast.

TRACK YOUR PROGRESS

Build fasting streaks, review your history, and see stats like your longest fast and average duration. Phase transition notifications keep you motivated as you hit each new milestone.

BEAUTIFUL & PRIVATE

iFast features a clean, dark interface designed for quick glances. Your data stays on your device. No account required, no data collection, no ads, no subscription.