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Zero: Fasting & Health Tracker

Zero Longevity Science, Inc.
4.8 out of 5

About Zero: Fasting & Health Tracker

It’s time to get off the dieting seesaw. With Zero, tap into the power of intermittent fasting and other healthy habits to lose weight and build momentum on your journey toward living longer, better.


Zero Members have lost millions of pounds — and that’s no accident. Featured in Good Housekeeping, Men’s Health, Fortune, Techcrunch, Women’s Health, The Tim Ferriss Show, and more, Zero is the world’s most popular fasting app. We help you leverage the science of health in simple ways you can practice daily to build habits that last a lifetime.

Rooted in scientific research and supported by Zero’s world-class Scientific Advisory Board, Zero helps you stack healthy habits to make big changes. You’ll start with one simple habit, like fasting, and build incrementally to improve your exercise, sleep, and more. Get ready to meet a healthier you.


The world's most popular Fasting Timer helps you track your fasts, your progress, and your goals. Start your Timer and stay on target with all popular fasting types, including:

• 13-HOUR FAST, based on research by Dr. Satchin Panda (Salk Institute), this 13-hour or “circadian rhythm fast” aligns your eating window with your body’s clock.

• 16-HOUR FAST, or the 16:8 intermittent fast, used by celebrities, athletes, and millions of Zero Members to manage weight and improve metabolic wellbeing.

• 18-HOUR FAST, or 18:6, for more advanced fasters.

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


Zero’s real-time tips, individualized stats, and Personalized Fasting Zones have helped millions of Members form new habits and achieve their weight-loss and health-gain goals. Discover insights into the changes your body is experiencing and get guidance and accountability along the way.


Fasting is a great starting point for living a longer, healthier life. But if you’re committed to losing weight, gaining health, and boosting longevity, you’ll need to look to the Four Pillars of Health: Nutrition, Activity, Sleep, and Restoration. Zero’s innovative yet simple features help you build lifelong habits across these Four Pillars for accelerated progress and transformative change.


The Loop helps you visualize your journey and celebrate wins across the Four Pillars of Health. As you log or sync your data, you’ll see the corresponding color for each Pillar added to the Loop. Watch as your smart choices add up over days, weeks, months, and years.


Build actionable, data-driven habits with the Habit Tracker. Build consistency by logging your meals, workouts, and more. If you’re using an Apple Watch, Apple Health, Fitbit, Oura Ring, or other apps and wearables, you can sync them with Zero to make this a completely automated experience.


Stay focused with expert-led, science-backed content, community Challenges, achievements, and more. Zero is your partner for building healthy habits that propel you towards better, lasting health.

Download the Zero app to get started with your free trial.

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.

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