Zero - Intermittent Fasting

58.7K reviews
Content rating
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About this app

Zero is the world's most popular fasting app.
As seen in Women’s Health, The Tim Ferriss Show, The Drive and more.
Unlock the power of intermittent fasting to improve your health and manage weight.

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.

Reach your healthy weight goals no matter what diet you follow - from keto, or low carb, to simple calorie counting - and unlock the full longevity benefits of fasting through Zero’s expert guidance and content.


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 an all new calendar view. Sync with Google Fit to track health markers like weight 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.

CHALLENGES - Opt into Challenges that align with your goals, invite friends, unlock Achievements, and stay motivated with guidance from our experts and the chance to win exclusive prizes.

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 - See how your fasting practice correlates with other health markers like weight and heart rate. Spot trends and adjust your behavior to stay on target.

ASK ZERO - An expert in your pocket. Submit your fasting questions, then tune in for a chance to get answers from experts like Dr. Peter Attia.

CUSTOM PRESETS - When your fasting needs are more unique than our popular presets, you can create your own.

ADVANCED JOURNAL WITH IN-THE-MOMENT MOTIVATION - Feeling hungry? Log your mood and receive responsive content including exclusive Fasting Meditations.

With Zero 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 when preparing for blockbuster films and millions of Zero users to manage weight.

• 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

• Unlock achievements to celebrate milestones and stay motivated

Choose your favorite fasting protocol and Zero will track your progress on your Android device with Google Fit integration to sync your weight and sleep.

Zero Plus terms:

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

Read more terms & conditions:
Terms of use:
Privacy policy:
Updated on
Sep 23, 2022

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Device or other IDs
This app may collect these data types
Location, Personal info and 5 others
Data is encrypted in transit
You can request that data be deleted
58.7K reviews
September 2, 2022
Fasting features are excellent but the frequent Interface changes are really annoying. Everytime theres a change it glitches out and freezes for days. The recent changes modified the screen after a completed fast and the screen just stays there! I'm in the middle of waiting for it to close so I can start my next fast. Also theres stuff everywhere it's just so busy I only use the widget.
17 people found this review helpful
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Zero Longevity Science, Inc.
September 14, 2022
Hi there - Thanks for this feedback. When a fast is ended the achievement screen displays for 1 hour then the Time Since Last Fast counter displays. To start a fast immediately after ending, just scroll down slightly and tap 'Start Fast'. If you'd like to provide further feedback please email us at & our team will assist.
Deborah Lopez
September 1, 2022
I like the app and tried the zero plus trial. I logged in food to help with my journey. Later I did subscribe to the Zero plus however, now when I wish to log food it opens a window and immediately closes it. This was one of the reasons I joined. Reaching someone to help is nearly impossible. All the replies say is that I logged in to the wrong account. That is not the case. I gave it a 3 and that is too much. So disappointing.
8 people found this review helpful
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Zero Longevity Science, Inc.
September 14, 2022
Hi Deborah, Sorry to hear about this issue with meal logging & the irrelevant replies you received. The food log issue was a bug that should now be fixed by updating to the latest version of the app in Google Play. If you don't mind, can please email us again at & include case ID "RJMeal" and our support team will assist.
Polly Bennett
August 19, 2022
I used the Zero app on my Google Pixel for well over 150 fasts. About 7 weeks ago I purchased an iPhone 13 Pro Max, installed the app and opened it. Fasts from April 12 - July 26 are not showing on the calendar or data record in the app. App engineers say the data is in "the cloud" but can't figure out why they aren't showing in the app. When I hit 250 fasts it sent a "congratulations" notice so I know it has all the data. It's frustrating not to find a solution and see my total record.
6 people found this review helpful
Did you find this helpful?
Zero Longevity Science, Inc.
August 19, 2022
Hi Polly – We're sorry to hear about this issue with fast data not displaying and are here to help. Can you please send us an email at and include the details of what's occurring so our support team can assist? – Team Zero

What's new

Hi Zero crew, today's release includes several performance updates and bug fixes. If you have any feedback or questions, please connect with our Support team at