The World’s Most Popular Fasting App

Fast forward to better health.

Fast track your goals when you track your fasts with Zero—expert guidance, insights, and accountability to unlock a longer, healthier life.

Hours Fasted

3.7 Billion

The Basic Features

Four essential tools for the fasting life.

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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.



Fuel your fast with our ever-growing content library curated by Chief Medical Officer, Dr. Peter Attia.



Chart your progress and map your journey, with the option to sync with Apple Health and Google Fit. We’ll help you track health markers like weight, resting heart rate, and sleep, to see how they evolve with your fasting practice.



Reflect on how you feel during your fasts. We'll graph your moods so you can track trends and adjust over time.

Your Personal Fasting Coach

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.

Enhanced Experience

Master your fasts with advanced statistics, custom fast presets, a responsive mood journal, and an all-new timer with fasting stages.

Learn more about Zero Plus

Why Fasting?

Fasting is a mindful approach to eating, and a powerful tool for living a healthier, longer life.

Whether you want to boost energy, improve body composition, accelerate cellular repair, or mitigate your risk for metabolic disease, a mounting body of scientific literature shows that fasting can help you reach your goals.

Learn more about fasting with Zero

What people say about us


It's easy and it motivates me to keep on track. Cutting out my evening snacks has been easy and I've reached my weight goal in a healthy way. Here's to the next 10lbs slipping away!

- Luiza B

What people say about us


Lost 20lbs with this app!!!! Already recommended this app already!! Amazing

- Jessica N

What people say about us


I love all the articles. I've learned so much. The timer is great and easy to use.

- Polly F

What people say about us


Very user friendly. Nice Interface, and good articles available to learn more about fasting.

- Lori P

What people say about us


I love the accountability the app gives me and the education information provided.

- Kimberly T

What people say about us


Best fasting app available with awesome resources and support.

- Tara F

What people say about us


I love how it explains in detail what each fasting is done for and all the information for beginners is amazing

- Ivesha H

Fuel your fasts

We create and curate expert resources so you have the fast facts at your fingertips.

Our ever-growing library stays current with the latest research to help you advance your awareness alongside your fasting practice.

Check out our blog

500,000 People Currently fasting

Get on the Fast Track

Download Zero and experience the benefits of fasting for yourself.

A monthly digest with our latest fasting tips.

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