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IronFast
The smartest way to fast. Track your fasting window, monitor body phases, stay hydrated, and build streaks — all from your wrist.
iPhone
Apple Watch
Health Kit
The smartest way to fast. Track your fasting window, monitor body phases, stay hydrated, and build streaks — all from your wrist.
Built for real fasters. No fluff, no ads, no tracking.
Beautiful circular timer with real-time countdown. Choose from 16:8, 18:6, 20:4, OMAD, or create your own plan.
See exactly what's happening inside — from catabolic state to autophagy. Backed by research, explained simply.
Start, stop, and monitor fasts right from your wrist. Syncs instantly with your phone.
Log water intake and get gentle reminders to stay hydrated during your fasting window.
Track your weight over time with clean charts. Syncs with Apple Health for a complete picture.
Total fasts, completion rate, current streak, average duration — see your progress at a glance.
Complete log of every fast with duration, plan type, and timestamps. Scroll through your journey.
Built-in safety checks for pregnancy, eating disorders, diabetes, and more. Your safety comes first.
Unlock the full experience. Free 7-day trial.
Create unlimited schedules tailored to your lifestyle
Deep insights, trends, and weekly charts
Read and write weight and hydration data
Protect your streak when life gets in the way
Access your complete fasting log forever
Charts and trends alongside your fasting data