Zero review
A fasting-focused app with broad health tracking and connected-device data.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Zero is a mobile fasting and nutrition app for people building weight-loss and health habits. Its core tools center on a fasting timer and history, alongside tracking for weight, sleep, resting heart rate, caloric intake, activity, glucose, and ketones. It is a fit for people who want fasting alongside a wider set of health measures, rather than a dedicated meal-planning app. Zero is available on iOS and Android, with a free version and paid Zero Plus subscriptions.
Health-platform connections are a notable part of the app’s scope: Zero lists direct integrations with Apple Health, Google Fit, Fitbit, and Oura. For meal tracking, it supports photo or text entry with nutrition estimates, and its Protein Score tracks progress toward a protein target. The app also includes personalized water goals and water tracking. These features can suit someone who wants fasting, nutrition, and several health metrics in one mobile routine; people who need meal plans or barcode-based food entry should look elsewhere.
Zero Plus adds an advanced fasting timer, longer-range statistics and trend comparisons, premium content, Fat Burning Mode, and smart meal logging with nutrition estimates and a Protein Score. The published plans include Zero Plus Monthly and Zero Plus Yearly, while the free version provides an entry point for basic use. The product’s focus is tracking rather than meal planning, and it does not include a barcode scanner. Choose Zero if fasting history, health-data connections, and related metrics are central to your routine; consider an alternative if planning meals or scanning packaged foods is essential.
Zero pros and cons
- Where it wins
- Tracks fasts, weight, sleep, activity, glucose, and ketones
- Connects with Apple Health, Google Fit, Fitbit, and Oura
- Logs meals by photo or text, with nutrition estimates and a Protein Score
- Where it doesn't
- No barcode scanner or meal-planning tools
- Advanced statistics and other Plus features require a subscription
- Available on mobile only
Zero fact sheet, pricing and score →
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