Start in seconds
Choose a familiar fasting plan or make your own. Start now or from a recent scheduled time.
A focused fasting tracker for iPhone
Fast simply.
See progress clearly.
Start a fast without ceremony. Follow a clear timer, build a flexible routine, and understand your history without noise or pressure.
Coming soon to theApp Store
Explore LightnFast
FlexibleYour schedule, not ours
HonestStats without overclaiming
PrivateHealth data stays local
Built for your rhythm
Everything you need.
Nothing shouting for attention.
Understand the day
See elapsed time, your eating window, daily goals, and carefully qualified fasting stages.
Review real progress
See completed fasts, streaks, and total fasting time, all calculated from your saved records.
Inside LightnFast
A routine you can see.
Actual app screens, shown with sample records.
Keep goals close
Check off protein and strength goals, and log water alongside your fast.
Look back by day
Browse your calendar, open a past fast, and follow your streak.
Set your rhythm
Choose your schedule, eating window, and fasting days.
See what adds up
Review outcomes, streaks, and time spent fasting in one place.
Local by default
Your health history belongs to you.
No LightnFast account, no ads, and no third-party trackers. Health data stays local. Optional iCloud sync keeps your app-entered fasting records and goals available across your devices.
Read the privacy policy →Simple terms
Start with the core.
Go further with Pro.
Is LightnFast a subscription?
The core fasting tracker is free. Optional monthly and yearly Pro subscriptions add features including widgets, Apple Health, and Apple Watch.
Does it provide medical advice?
No. Stage timing is informational and does not measure your biology or replace professional care.