My Fasting Clock

MyFastingClock is a free fasting timer that works in any browser, on your phone or your computer. There is nothing to install and no sign-up needed to start a fast.

Pick a 16:8 or OMAD preset, or run an open-ended fast with no time cap. As the clock runs, it shows which fasting stage you are in and what that stage means, so you can see where you are without doing the math.

An optional free account keeps your history in sync across devices and adds a simple friends view that shows whether a friend is fasting, never how many hours.

The site also includes a library of plain-language notes on fasting: getting started, longer fasts, what the research does and doesn't show, and the history of fasting.

Free to use, supported by ads and optional donations.