Interval Timer | Cero

About this app

Cero is the interval timer you were waiting for! It will enhance your workouts: HIIT, Tabata, running, yoga, WOD, strength training, MMA, stretching, circuit training, boxing... INTUITIVE AND EASY TO USE A neat design and a hugely intuitive interface to make your User Experience absolutely great! SIMPLE AND ADVANCED TIMER MODES Two different timer modes. Set them up in just a few seconds. You'll be able to choose between the simple mode (the most popular and easy to configure). Or the advanced one, which is thought for those of you who need a highly customized experience. CLEAR INTERFACE Everything is thought to give you the maximum customization in your timers, without driving you crazy. CREATE YOUR OWN CUSTOM INTERVALS You'll be able to create your own intervals. Just choose the icon it represents the most, the color, and the calorie expenditure level. SAVE MULTIPLE WORKOUT TIMER SETTINGS Just create and save as many timers as you need, without limitations! AVAILABLE FOR YOUR APPLE WATCH Cero is also compatible with Apple Watch, and it even has a heart monitor! Great for all those outdoor activities that require having the count of intervals. CALORIE TRACKER The calorie expenditure of each workout will be saved into Apple Health automatically! SYNC BETWEEN DEVICES Cero automatically syncs your timers and settings across all your devices! Forget about having to configure, again and again, your interval timers. PEOPLE LOVE CERO! With a 4.8 stars average worldwide and tens of thousands of users using it frequently! "The High-Quality Timer I needed. Man, this is such a well made app. Intuitive, simple when it needs to be, complex (but not complicated) when needed as well." -Bobthetheman "Great app! Cero keeps me on track toward my fitness goals. Download it. Use it. See the change." -Karina_Soto "Great HIIT timer! Wonderful app with beautiful UI, easy to use, and maintained by an attentive developer. Keep up the good work" -mjeshurun "Everything you need from a timer. This app is simple and gives me everything I was looking for. Great timer for HIIT training." -Hubert Z. Feedback and suggestions: support@cero.app

This app has been updated by Apple to prepare for watchOS 27 compatibility. No new features are included. - Solve minor issues

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1. First observed Sep 4, 2026 · 6:27 AM Free