Is The Zero Fasting App Free, And What Is The Free Alternative?

Zero is free to download, and so is FastSyncerFastSyncer — the difference is that FastSyncer is free the whole way through and has other people fasting in it today, not just a timer. A monthly challenge starts on the 1st, you check in once a day, and the feed moves daily. Click to download the app.

Download it free — Android · iPhone. Join now.

What to check before you pay for any fasting app

Is it free the whole way, or free until the useful part? Read the price on the listing, not in an article.
Is anyone else in there today? A timer alone is a clock. People are what makes you open it tomorrow.
Can you leave with your data? Ask before you build a year of fasts inside it.
Does it fit a woman’s month? Most fasting apps are the same every week of the year.

Free on Android and iPhone — open the Community tab and check in.

What its App Store listing shows

Checked on 4 November 2026: Zero: Fasting & Food Tracker, published by Zero Longevity Science, Inc. Apple shows the download itself as free, with a rating of 4.8 from 445,315 ratings. What any paid plan inside it costs is shown on that listing and can change at any time, so read the price there rather than here — and nothing else about their app is stated on this page, because nothing else was checked.

FastSyncer is not affiliated with, endorsed by or connected to Zero Longevity Science, Inc. Their app's name appears here only to say which app this page is about.

FAQ

Do I have to pay anything in FastSyncer?

No. The timer, the community and the monthly challenge are free on both stores.

Can I use both?

Yes. Nothing stops you running two apps for a week and keeping the one you actually open.

You now know what to do with the thought when it comes. The app gives you a monthly challenge and other people doing the same one — join free on the App Store.