Online fasting timer
A fasting timer that runs in this browser for 16:8, 18:6, OMAD, and open-ended fasts. No app store. Pick a protocol below, or open the dedicated 16:8 and OMAD pages.
Free. No signup. Runs in this browser.
The timer widget on this page is pre-selected for this protocol. Use Start Fast when JavaScript is on.
Questions
Does it work without an app?
Yes. Open this page and start. Installing to the home screen is optional. This site is a web timer, not the iOS Fasting Clock apps.
What if I close the tab?
The running fast is saved in this browser on this device. Come back to the same site. Do not clear this site’s data. Sign in only if you want the same log on another phone.
16:8 vs OMAD?
16:8 is an 8-hour eating window. OMAD is one meal. They are different loads. Use /16-8 or /omad if you already know which one you want, or start here and pick a chip.
Is it free?
Yes. No time cap and no subscription. Ads and optional donations keep it free.
Is this medical advice?
No. It is a clock. It cannot see your medicines or labs. Stop if you feel seriously unwell.