Zero - Intermittent Fasting

60.7K 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
May 15, 2024

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

60.2K reviews
Kelly Astleford
April 12, 2024
I like the app, but 80% of the time the main page is just two white squares. It isn't helpful at all! I checked for an update, but there is nothing. I'm going to try out a different app. Very frustrating! Update: switched over to Fasting Tracker. It does the same thing as Zero and actually opens! I really liked Zero when it worked, but I'm glad I found a suitable replacement. I will check back periodically to see if Zero corrects the problem, but I don't have high hopes.
61 people found this review helpful
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Zero Longevity Science, Inc.
April 19, 2024
Hi Kelly – We're sorry to hear about this issue with just two white squares displaying and are help. Please email our support team directly at with any details about this (and any screenshots if possible) and include reference #75439 so the support can help troubleshoot. –Team Zero
Inna Konovalenko
April 15, 2024
Have been using paid version. As of today, cannot use the app at all: "This version of Zero is no longer supported. Please update to the latest version to continue using the app." I uninstalled/reinstalled, cleared cache - no change. It would be sad to lost quite a bit of data I've accumulated over the years. Hope the issue is fixed. Update: the bug was fixed
6 people found this review helpful
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March 20, 2024
Keep me on track and a great reminder of when to begin my fed-state/fast-state. (5 stars) Updated Review: This app is no longer what it was. Whenever I want to begin or end my fast, the timer is no longer visible. I'd have to restart my phone for the timer to be displayed. The updates have made the app unbearable instead of useful. (1 star)
23 people found this review helpful
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Zero Longevity Science, Inc.
March 25, 2024
Hi there — Thanks for reaching out and sorry to hear this! If you'd like help with this or have other questions, please contact our support team at and reference #74733. We'll be on the lookout for your reply. —Team Zero

What's new

Thanks for using Zero!

In this release, you’ll find a number of performance improvements and fix for bug some people were experiencing when opening the app.

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