Meditation & apps Limited evidence

Zero

Fasting timer with protein tracking and a large habit community.

Zero is a countdown clock that grew a nutrition layer. Useful if a visible timer keeps you honest. Useless if you already eat in a window and do not need a streak.

How to use

Set a 13–16 hour window. Track protein when you eat. Skip multi-day fasts unless a clinician is in the loop.

Details

Platforms
iOS, Android
Subscription model
Freemium
Key features
Fasting timer, Protein tracking, Fasting zones
Guidance
Both
Focus areas
Focus

Editorial rating ★ 4.1

Best-known fasting timer. The science lives in the window, not the badge.

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