Zero
Intermittent fasting tracker with photo meal logging, a protein score and water tracking.
Updated · AppBreakup editorial · iOS, Android
Is Zero free?
Free plan, plus paid plans
Switch from Zero to
All 5
FasticFree plan + paid
LifesumFree plan + paid
Carb ManagerStarting price: $3.33 a month, billed annually (Premium)
- Verified facts
- 4 of 4
- Alternatives ranked
- 5
- Approved reviews
- 0
- Visits sent from here
- 0
About Zero
Zero is one of the best-known intermittent fasting apps. Its core is a one-tap fasting timer that shows progress through your fast in real time and builds up insights from your history, and you can end a fast from a smartwatch. In recent versions it has added meal tracking: snap a photo or type what you ate and it estimates the meal with protein front and centre, feeding a daily Protein Score meant to help you protect muscle while eating in a shorter window. It also sets a personal water goal and tracks hydration, with streaks, badges and articles for motivation. The basic fasting timer is free; the fuller coaching, insights and logging come with a paid membership that starts with a free trial. Zero runs on iPhone and Android and suits people for whom fasting is the main habit and food logging is secondary.
Best for: People who make intermittent fasting their main habit and want light meal tracking alongside.
Zero pricing (checked Nov 8, 2026)
Each line is quoted from Zero's own site, with the page it came from.
| Plan or term | What it says | Checked | Source |
|---|---|---|---|
| Free trial | Yes | Nov 8, 2026 | zerolongevity.com |
Pros and cons
What works
- Simple one-tap fasting timer with history and insights
- Photo or text meal logging without weighing food
- Protein Score gives one clear daily target
Why people leave
- Most insights and logging need the paid membership
- Nutrition tracking is lighter than a dedicated calorie counter
- No web version
Zero vs Fastic, Lifesum and Carb Manager
From each app's listing and the prices verified on its own site. A dash means we haven't verified it yet.
| Attribute | Zero | Fastic | Lifesum | Carb Manager |
|---|---|---|---|---|
| Pricing | Free plan + paid | Free plan + paid | Free plan + paid | Free plan + paid |
| Verified price | — | — | — | $3.33 a month, billed annually (Premium) |
| Free plan | Yes | Yes | Yes | Yes (Basic account) |
| Open source | No | No | No | No |
| Self-hostable | No | No | No | No |
| Platforms | iOS, Android | iOS, Android | iOS, Android | Web, iOS, Android |
Top Zero alternatives
See all 5- 1Fastic68.8
Fasting timer plus a food scanner, recipes and an AI nutrition chatbot in one app.
- 2Lifesum52.6
Full food tracker with diet plans and a built-in fasting tracker, for more detailed logging.
- 3Carb Manager51.2
Low-carb and keto tracker with a fasting timer, if you combine keto with fasting.
- 4
Yazio50.0Calorie counter with a built-in intermittent fasting timer and plans, so food logging and fasting live in one app.
- 5
MyFitnessPal49.0Huge food database for logging meals alongside a fasting tracker, for people who want nutrition data too.
Why people left Zero
In reviewers' own words, from reviews of the apps they moved to. These are their opinions, not ours.
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Reviews
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Zero: common questions
What is Zero?
Zero: Intermittent fasting tracker with photo meal logging, a protein score and water tracking. Best for people who make intermittent fasting their main habit and want light meal tracking alongside. Available for iOS and Android.
Is Zero free?
Zero has a free plan and paid plans.
How much does Zero cost?
Zero is free with paid plans. Free trial: Yes. Checked on Zero's own site, November 2026.
Does Zero have a free trial or refund?
Free trial: Yes. Source: Zero's own site.
Is Zero open source?
No, Zero is not open source.
What platforms does Zero run on?
Zero is available for iOS and Android.
What are the best alternatives to Zero?
The highest-ranked Zero alternatives right now are Fastic, Lifesum and Carb Manager. See the full ranked list for pricing, platforms and verified facts.
Zero vs Fastic: what's the difference?
Both Zero and Fastic are free with paid plans. Both run on iOS and Android.