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About Zero - Fasting Tracker

Zero is the world's most popular fasting app.
An intuitive tracker with essential fasting tools.
Harness the power of intermittent fasting to improve your health.

Now, with Zero Plus, we bring all new premium features to millions of fasters.

Zero’s advisory team includes some of the world’s leading doctors and researchers, including our Chief Medical Officer Dr. Peter Attia, who guides our fasting protocols and content creation.


TIMER - Set your goal, start your timer, stay on track. We’ll be with you from start to finish with reminders and insights to keep you motivated.

LEARN - Fuel your fast with our ever-growing content library curated by Chief Medical Officer, Dr. Peter Attia.

STATISTICS - Chart your progress and map your journey, with the option to sync with Apple Health. We’ll help you track health markers like weight, resting heart rate, and sleep, to see how they evolve with your fasting practice.

JOURNAL - Reflect on how you feel during your fasts. We'll graph your moods so you can track trends and adjust over time.

Unlock all of the benefits of fasting with Zero Plus.

CUSTOM PLANS - Fast track your fasting goals with a personalized protocol and adaptive recommendations from our team of experts.

PREMIUM CONTENT - Cut through the noise with an exclusive, ever-growing library of videos, articles, audio segments, and Q&As from fasting experts like Dr. Peter Attia.

FASTING ZONES - Know what's happening in your body so you can stay motivated to reach key metabolic milestones.

ADVANCED STATISTICS - Chart your fasting journey. Track your time spent in each Fasting Zone. See how your fasting practice correlates with other health markers. Spot trends and adjust your behavior to stay on target.

ASK ZERO - For all those times a question pops into your mind mid-fast, Ask Zero is here to help. Submit your fasting questions, then tune in for a chance to get answers from experts like Dr. Peter Attia. What could be better than having an expert in your pocket?

CUSTOM PRESETS - When your fasting needs are more unique than the most popular presets, you can create your own. Name your fasting type and save it to your favorites.

ADVANCED JOURNAL WITH IN-THE-MOMENT MOTIVATION - Feeling hungry? Log your mood and receive responsive content including exclusive Fasting Meditations.
With Zero and Zero Plus you can quickly start your fast based on science from leading doctors and researchers.

• 16-HOUR FAST, or the 16:8 Intermittent Fast, used by celebrities like Hugh Jackman and Halle Berry when preparing for blockbuster films

• CIRCADIAN RHYTHM FAST, based on research by Dr. Satchin Panda (Salk Institute), this 13-hour fast starts around sunset to align your eating window with your body’s clock. Zero automatically calculates the daily sunset for you.

• 18-HOUR FAST, or 18:6 for more advanced fasters

• Other popular fasts include OMAD (one meal a day), 20:4 fast and custom fasts up to 7 days

• Earn BADGES to celebrate your milestones and stay motivated

• Stay accountable with GROUP FASTS and special events

Choose your favorite fasting protocol and Zero will track your progress on your Android phone with GOOGLE FIT integration to sync your weight, resting heart rate and sleep.

Zero Plus terms:

Payment will be charged to the credit card connected to your Google Play Account when you confirm your subscription purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24-hours before the end of the current subscription period. You may manage your subscription by going to your Account Settings.

Read more about our terms & conditions:
Terms of use:
Privacy policy:

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Frequently Asked Questions(FAQ)

What is Zero?

Zero is the world's most popular fasting app that helps improve your health through intermittent fasting.

Who is on Zero's advisory team?

Zero's advisory team includes leading doctors and researchers, including Dr. Peter Attia, who guides fasting protocols and content creation.

What are the free features of Zero?

The free features of Zero include a timer to track your fasting, access to a content library curated by Dr. Peter Attia, statistics to chart your progress, and a journal to reflect on your fasting experience.

What are the premium features of Zero Plus?

Zero Plus offers premium features such as custom plans, exclusive content, fasting zones, advanced statistics, Ask Zero for expert advice, custom presets, and an advanced journal with in-the-moment motivation.

What fasting protocols can be followed with Zero?

Zero offers various fasting protocols including the 16:8 Intermittent Fast, Circadian Rhythm Fast, 18:6 fast, OMAD (one meal a day) fast, 20:4 fast, and custom fasts up to 7 days.

How does Zero Plus subscription work?

With Zero Plus subscription, payment is charged to your connected credit card and subscriptions automatically renew unless turned off. You can manage your subscription in your Account Settings.

Where can I find Zero's terms and conditions?

You can find Zero's terms of use and privacy policy on their website:
Love it!
Jessica Telesford
I love this app♥️
Ronewa Sharon Tshikonelo
Great motivator!
Linda Gruen
Nice app...💃♥️ Very useful and helpful to track fasting...
Criseph Casanova
Although I love the app, I used to rely on the widget (which had some bugs, but still usable) for quickly accessing the fast. I don't see the widget anymore when I try to add it. What changed?
Moonis Ahmed
Great fasting tracking app, with added bonus of mood chart, check in with notification reminder. I'm just using the free version which is fab. Paid version on the pricy side for my budget.
Katherine Edgar