How to use it
- Choose a schedule or type the hours you want to fast.
- Press Start fast now when you stop eating, or set an earlier start time.
- Watch the countdown. When the fast ends the eating window begins, and the cycle repeats every 24 hours.
How it works
The cycle is 24 hours from your start time: the first part is the fast and the rest is the eating window. The page works out where you are from the current time on every tick, so it stays right if the tab was closed or asleep. The start time and fasting hours are saved in localStorage.
Worked example
With 16:8 and a fast started at 8 pm, the fast ends at noon the next day, the eating window runs until 8 pm, and the next fast begins.
Good to know
Water, tea and coffee without sugar are often allowed during a fast, but rules differ by plan. This is a timer only, not medical advice.