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.
Screenshots show an earlier development build with sample records. The current Today screen also includes a Pro status button.
FlexibleYour schedule, not ours
HonestStats without overclaiming
PrivateHealth data stays local
Inside LightnFast
A routine you can see.
Earlier development screens with sample records; the interface may differ in your build.
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.
Try LightnFast on your iPhone.
Join the public beta and try it with your own routine.