Zero - Intermittent Fasting

60.3K reviews
Content rating
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About this app

Zero is the world's most popular intermittent fasting app.
As seen in Women’s Health, Fortune, Men’s Health, The Joe Rogan Experience and more.
Unlock the power of intermittent fasting to improve your health and lose weight without counting calories or dieting.

Reach your healthy weight goals no matter what diet you follow — from keto or low carb to paleo - and never count calories again. With Zero’s expert guidance and simple intermittent fasting tracker, you’ll unlock the full benefits of intermittent fasting to lose weight and burn fat faster.


TIMER - Set your intermittent fasting goal, start your timer, and stay on track with reminders and insights to keep you motivated on your weight loss journey without the need to count calories.

LEARN - Fuel your intermittent fasting with our ever-growing content library.

STATISTICS - Chart your progress and map your weight loss journey. Sync with Google Fit to track health markers like weight and sleep to see how they evolve with your intermittent fasting practice.

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

CHALLENGES - Opt in to Challenges that align with your health goals, invite friends, unlock Achievements, and stay motivated with guidance from weight loss and fasting experts.

Unlock all of the benefits of intermittent fasting with Zero Plus to lose weight and burn fat faster.

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

FASTING ZONES - Know what's happening in your body so you can stay motivated to lose weight and keep it off without dieting or counting calories.

ADVANCED STATISTICS - See how your intermittent fasting practice correlates with other health markers like weight loss. Spot trends and adjust your behavior to stay on target.

• 16-HOUR FAST, or the 16:8 intermittent fast, is used by celebrities when preparing for blockbuster films and millions of Zero users to manage weight.

• CIRCADIAN RHYTHM FAST, this 13-hour intermittent fast starts at sunset to align your eating window with your body’s clock. Zero automatically calculates the daily sunset for you.

• 18-HOUR FAST, or the 18:6 intermittent fast, is for more advanced fasters.

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

• Unlock Achievements to celebrate milestones and stay motivated.

Got questions? We have answers.

Can intermittent fasting help me lose weight?

Yes! Fasting alters how often you eat, which helps you eat less without counting calories or going on a diet. Intermittent fasting also encourages healthier, more conscientious choices around what you eat. Finally, intermittent fasting enables your body to tap into its fat stores for fuel so that you burn fat faster.

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
Dec 5, 2023

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

Ratings and reviews

59.8K reviews
Adam Amin
November 20, 2023
This is a great app... I'm on the free version so I can't speak on the paid experience. I was recently looking for a way to export my weight data. On the free version it looks like I can only export my fasting data. Still a 5 star app for everything else but the lack of weight data export is a disappointment. 4.75 stars for that.
5 people found this review helpful
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Zero Longevity Science, Inc.
November 21, 2023
Hi Adam - Thanks so much for taking the time to let us know this feedback. We'd love to hear any specific reasons you'd like to export weight data! Please send us an email at with the details (and include reference #69110) and our support team will get the details to the right team. –Team Zero
A. Y. H
November 17, 2023
I have been using the app for years. Suddenly the app isn't opening without crashing. Can't record anything and all my data looks to be gone. Can't check for sure because app force closes within seconds of opening. Hope they fix whatever bug is messing up the app. -update: Received response from co. Bug was fixed and working again. Kudos to them for really being on top of things and troubleshooting so quickly. All data is back as well. Thanks 😊
6 people found this review helpful
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Zero Longevity Science, Inc.
November 17, 2023
Hi there– We experienced an issue with one of our 3rd party services that impacted the app's performance. The issue should be remedied but if this is still occurring please email our support team directly at with any details about the crash & include reference #68888 so our support team can assist. –Team Zero
D Floyd
October 2, 2023
The app was great when I started using it but has become extremely laggy over time, to the point where the fasting timer itself (the thing you use the app for) doesn't load half the time, and my phone is fairly decent and has no problems with more intense applications. I got tired of the lag, cancelled my subscription and am uninstalling for a different app.
4 people found this review helpful
Did you find this helpful?
Zero Longevity Science, Inc.
October 3, 2023
Hi there – We're sorry to hear that you've encountered issues with the app and are here to help resolve it. Can you please send us an email at and include reference number #66835 so our support team can take a closer look? We'll be on the lookout for your email. –Team Zero

What's new

Thanks for using Zero!

This release includes a number of performance enhancements and bug fixes related to fasting data, Personalized Fasting Zones, and more.

If you have any feedback or questions, please contact our Support team at