Build an interval workout around the way you train.
Cero is a flexible interval timer for HIIT, Tabata, circuit training, WODs and HYROX preparation. Set up a quick work/rest timer or program each interval in detail. Distinct colors, large controls and reliable cues keep you focused on the session instead of the clock.
BUILD YOUR SESSION
• Set work, recovery, sets, warm-up and cool-down.
• Create advanced workouts with custom intervals, colors, icons and intensity levels.
• Save, duplicate and reorder timers.
• Share timers by file or QR code.
• Review completed sessions in workout history.
STAY IN THE WORKOUT
• Follow compatible sessions with Live Activities and Dynamic Island.
• Start saved or recent timers from Home Screen widgets.
• Use Siri and Shortcuts to start, pause, resume and stop a timer.
• Put Gym Display on a larger screen or mirrored TV.
• Choose a default song or assign music to individual intervals.
• Customize sounds, voice cues, vibrations and background alerts.
TRAIN BY HEART RATE
Adaptive HR can extend recovery until you reach your target heart rate, then guide hard efforts with low and high alerts. Pair a Bluetooth heart-rate monitor with iPhone or train with heart-rate data from Apple Watch.
COUNTDOWN AND STOPWATCH
The built-in countdown and lap stopwatch cover warm-ups, station changes, rest periods and race-day practice. Stopwatch sessions continue after you close and reopen the app.
ON APPLE WATCH
Run saved workouts from your wrist, follow heart rate and use the standalone countdown and stopwatch.
Cero can save completed workouts and estimated calories to Apple Health. Automatic iCloud backups help protect saved timers and custom intervals.
Useful for HIIT, Tabata, circuits, EMOM-style workouts, boxing rounds, strength and conditioning, indoor cycling, running intervals and hybrid race preparation.
Feedback and suggestions: hi@flawless.studio
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Best app I have found so far. It’s free and has a lot of settings. I only have 1 high/low intensity timer programmed in, so I dont know how many you can have without upgrading. But I only needed 1.
Developer Response
Thank you so much for feedback! 💚
Loved but last iOS messed it up
Baseballcurt35
This was an excellent app, however the last iOS update messed it up. Now when I start my workout (activate apple’s workout app) then start my Cero app, like I always did, the Apple workout app overrides the Cero app and Cero stops counting down (happens after the watch goes into sleep mode). The only way I can get it to work is to restart everything, turn off the watch, then turn it back on. Before the last update this was a 5 star app for sure!
Developer Response
Thanks for your feedback Baseballcurt35!We are preparing a new version for the end of June. This version will have fixed this issue and other useful features that will do Cero to be again a 5 stars app for you 😉
Perfect app for my HIT workout.
SpideyMike
This app is great - the timers are easy to set and it works perfectly for my routines. Easy to change and add more workout timers - can even name them (squat thrusts or whatever). If you like high intensity workouts you must get this app!!
Developer Response
Thank you so much for your feedback! 💚
Love it
EmoEric87
I love this app. I 100% recommend but not if they start charging a subscription or any of that ridiculous. Exactly what you need to hiit, or any kind of intervals at all.
Developer Response
Thank you for your feedback EmoEric! 💚
Cero for Apple Watch, rebuilt from the ground up.
• A redesigned Watch app that's faster and easier to read mid-workout
• Workouts run as Apple Watch workout sessions with live heart rate and save to Health
• Follow and control a Watch workout from your iPhone with a Live Activity
• New complications and a Smart Stack widget show the current interval and time left
• Quick timer, countdown and stopwatch redesigned for the wrist, with Always On support
• Your timers and appearance sync from your iPhone
Version 4.3.0
In-App Purchases
Cero Pro
Unlimited saved timers. No ads.
$14.99
The developer, Flawless Studio LLC, 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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Identifiers
Usage Data
Privacy practices may vary, for example, based on the features you use or your age. Learn More
The developer indicated that this app supports the following accessibility features. Learn More
Supported Features
VoiceOver
Dark Interface
Information
Seller
Flawless Studio LLC
Size
43.8 MB
Category
Health & Fitness
Compatibility
Requires iOS 16.0 or later.
iPhone Requires iOS 16.0 or later.
iPad Requires iPadOS 16.0 or later.
Mac Requires macOS 13.0 or later and a Mac with Apple M1 chip or later.
