Zero - Intermittent Fasting

59.3K 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
Nov 22, 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
59.3K reviews
Catherine Tran
November 3, 2022
Used to be great & simple. Now the UI/UX is ALWAYS constantly changing, that either it's buggy or the UX just doesn't make sense when you're trying to start or end a fast, or when trying to edit a start/end time. STOP CHANGING THINGS. MAKE IT WORK & THEN LEAVE IT ALONE. if things don't get fixed within the next couple months, will probably switch over to a different fasting app bc I am incredibly irritated at this point.
12 people found this review helpful
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Zero Longevity Science, Inc.
November 8, 2022
Hi Cathrine – Thanks for this feedback about the app's UI evolution. We're sorry to hear you're encountering issues and would like to help troubleshoot. Can you please send us an email at with details and include reference number 56963 so our support team can assist? – Team Zero
Jennifer Mattern
November 10, 2022
Update: Bugs haven't occured past few days so hopefully it's sorted. -- Over 250 fasts in. Recent changes are terrible. Glitches often. Changing goals triggers it. So does just... existing? Every other time I check my widget now, the fast semi resets. Says I'm not fasting when I'm hours in. Open the app to see the "start fasting" button... when I'm already fasting. When I tap that, it "starts" the fast, but w/ the start time hours prior. So it has the data. But interface syncs fail.
17 people found this review helpful
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Zero Longevity Science, Inc.
November 8, 2022
Hi Jennifer– UPDATE 2: Our support team would like to touch base w/you regarding the issues you're encountering but your contact info is not in this review. Responses to reviews have a character limit which is why we request contacting the support team directly @ to begin investigation into the specific issues. –Team Zero
Liam O'Brien
June 22, 2022
Fine app. I like what it has to offer as it's mostly a timer with so e reminders. They took away the timer from when you ended your last fast which is a bummer. I'd consider the premium for $10-15 a year since I've enjoyed it but it's $70. I mean I can set a timer on my phone for free and there are other apps for tracking weight, exercise... Ect. Not sure what they are thinking at that price.
54 people found this review helpful
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Zero Longevity Science, Inc.
July 5, 2022
Hi Liam — The basic functionality of Zero is free to use - this includes the basic timer, data tracking, syncing, and select content. Zero Plus is an optional premium upgrade with many more features. If you'd like help with the app's timer, please contact our support team at —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 contact our Support team at