Zero is the all-in-one fasting tracker and nutrition app built for real results. Most fasting and weight loss apps stop at simply tracking fasts or calories. Zero connects the full picture — fasting, protein, meals, hydration, and habits — so you actually change your body composition, not just your eating schedule.
Here’s how Zero helps you get there:
• Track your intermittent fasting — Engage timers, streaks, and insights keep you stay motivated and consistent on your entire fasting journey.
• Log meals the smart way — Skip the tedious manual meal entry routine. Snap a photo and get instant macros, protein composition, and clarity on how effectively your meals support your goals.
• Hit your Protein Score — Track your personalized daily protein target that adapts to your weight and goals. Better protein = better satiety, better muscle retention, better weight loss. Zero makes it automatic.
• Complete the equation: Fasting + Protein — Most people fast or track meals. Zero brings them together so you lose weight, protect muscle, and avoid the pressure and guilt of traditional calorie trackers.
• Stay hydrated to power your fasts — Water tracking helps you maintain energy, reduce cravings, and support metabolic function throughout the day.
• Build healthy habits that actually matter — Track movement, sleep, mood, and other daily pillars that reinforce your fasting and fueling routine.
• Challenge yourself — Hit protein targets, maintain fasting streaks, and stay accountable with motivating challenges built around outcomes, not vanity metrics.
• Learn the real science — Understand how fasting, protein, and hydration work together for sustainable weight loss and metabolic health — with insights from leading experts.
• See measurable progress — Watch your streaks grow, your protein consistency rise, and your body composition improve with clean, insightful trend views.
Whether you’re starting out or optimizing an existing routine, Zero gives you the structure, guidance, and clarity most apps miss.
Zero includes a free version and an optional subscription for premium features. A free trial is available.
Download Zero to get started.
Payment for Zero Plus will be charged to your iTunes 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: https://www.zerolongevity.com/terms-of-use
Privacy policy: https://www.zerolongevity.com/privacy-policy
Definitely, I love it. Before, I’d often lost count how many hours I’ve been already fasting or when should I start my feeding window but now I can quickly check it. Have been using Zero for 6 months in my year-long fasting journey and I can say that intermittent fasting never was so easy!
It is okay but without this key feature I am not going to pay
KarmaMatt
The are some bugs when counting the time… constant. I cannot select how much I want to fast like setting up my alarm - I need to select predefined timings… If this app will not have recipes that you can link with your termomix this app is too expensive and not worth of having I think.Adding option to create diet and put on your termomix (keto) would be a game changer to me and price of 40+ PLN of subscription worth it… else it should be waaaay cheaper.
Developer Response
Hi there again - Please send an email to our support team at support@zerolongevity and include the details of what's happening when counting the time. From there, our support team will be able to assist since we're unable to see your Zero account details in Apple Reviews. // You can select how much you want to fast by tapping the number in the upper right corner of the timer (it's in a small circle) ➝ tap one of the predetermined goals or tap 'Custom Fast' ➝ choose the duration ➝ tap 'CHANGE FAST'. // The basic functionality of Zero is free to use – this includes the basic timer, basic statistics, and select content. Zero Plus is an optional premium upgrade with an advanced timer, Personalized Fasting Zones, exclusive content and more. For support, please don't hesitate to send our support team a message. –Team Zero
Not useable
plmorpheus
I cannot login using Apple ID. At first I get info there is no internet connection (what is not true), and then that my Apple ID has expired (?!). It is enough for me to stop using this app before I even start.
Developer Response
Hi there — I'm very sorry about this issue. If you don't mind, can you please send a quick email to support@zerofasting.com so that I can take a closer look? Look forward to hearing from you. Best wishes, Michelle
I understand change and it's implications, but..
.overmorrow.
Guys, I really loved the simplicity and the design of the previous version, but now:- you FORCE an account creation, I understand that you want some data for that fasting and make something good out of this, but give us a way out?- the app is slow, I mean like really slow, it's "just" a timer but Everytime I launch an app now I have to wait like 3-5 seconds for me to see the time!? What gives?- Everytime I try to end fast, I HAVE TO WAIT for some connection in the background?! I understand you want me to give more data whenever I end the fast, I understand the fields and everything but you now made it a hassle, instead of an additional seamless thing.Improve at least the speed and usability of v3, it's ridiculously slow to perform such simple actions.
Better goals, better insights.
This update helps you personalize your goals and better understand your meals.
• Custom Activity & Sleep Goals: Edit your daily goals to fit your lifestyle
• Improved Barcode Coverage: We expanded our barcode database so more foods are easier to find and log.
• Fresher Oura Syncing: Oura data now updates whenever your latest data is synced.
• Meal Breakdown: See a simple breakdown of what’s in each meal.
• Settings Improvements: Small updates to make settings easier to navigate.
Version 7.6.0
The developer, Zero Longevity Science, Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
Health & Fitness
Location
Contact Info
User Content
Identifiers
Usage Data
Diagnostics
Privacy practices may vary based, for example, on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Size
220.4 MB
Category
Health & Fitness
Compatibility
Requires iOS 17.0 or later.
iPhone Requires iOS 17.0 or later.
Apple Vision Requires visionOS 1.0 or later.
Apple Watch Requires watchOS 10.0 or later.
Languages
English
Age Rating
16+
16+
This app has an age rating of 16+ with content restrictions. Some content may be rated higher, but access is managed by the developer through in-app controls.
Zero Longevity Science, Inc. has identified itself as a trader for this app and confirmed that this product or service complies with European Union law.
DUNS Number 081216076
Address 100 24th Street W Suite 1-1114 Billings Montana 59102 United States
