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
Its pretty hard to login with apple to an already registered account.Update: actually cant login with an already registered account. It always wants to add my email - with email login too.
Developer Response
Hi there, I sincerely apologize for the difficulty you're having with the app and I'd love to help resolve it. If you don't mind, could you please send us a quick note at support@zerofasting.com? Look forward to hearing from you! - Michelle
Best fasting app
1Napsugar
I love this app. It’s the perfect fasting companion. Best I’ve ever tried and it has great tips and stats. Congrats to the developer. It’s been very helpful.
Not free at all
9majom
There is no option for a free version at all. I downloaded it because read in articles that the free version has enough features. However, once submitted my data, I have no choice but start the paid version with seven days free. I cant even delete my already filled in data and account without choosing the payment. This is not GDPR compliant for sure, going to report it.
Developer Response
Hi there — Thanks for reaching out! If you’re having trouble accessing Zero’s free version or have other questions, please contact our support team at support@zerolongevity.com. We'll be on the lookout for your reply. —Team Zero
Disappointed
Szironka
Hello, I am disappointed that the information on fasting zones disappeared from my dashboard, replaced by a completly useless AI chat function. For me, it’s being treated like a 5 year old who needs overly simplified explanations. I am an educated adult and didn’t pay to find an otherwise free chat function but to gain insight in my own body, like you did before.
Developer Response
Hi there – The app was updated about a year ago with fat burning mode based on feedback from the greater community. If you'd like to let us know any detailed feedback or have questions please email our support team directly at support@zerolongevity.com with the details and include reference #81826 so the support can help troubleshoot. We'll be on the lookout for your email. –Team Zero
More tracking, fewer taps.
This update makes it easier to log your progress and stay connected to your health data throughout the day.
• New Navigation Experience: Logging is now accessible from anywhere in the app. Quickly add meals, track habits, and record progress with a single tap from the navigation bar.
• Explore More of Zero: We’ve expanded visibility of key health metrics and tracking tools, helping you better understand what’s available to support your health journey.
• Bug Fixes: Fixed an issue affecting fasting presets and improved the experience for members redeeming special offers through the App Store.
Version 7.9.0
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
235.2 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
