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HIIT Interval Timer | Cero

HIIT Interval Timer | Cero

Tabata, Gym & Boxing Workout

435 ratings
59 reviews
With Ads
💪 Health & Fitness
⚽ Sports
Free
In-App PurchasesWith Ads

Details

  • Released
  • Updated
  • July 15, 2017
  • September 28, 2026

Features

Developer

Flawless Studio LLC
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HIIT Interval Timer | Cero screenshot #1 for iPhone
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HIIT Interval Timer | Cero screenshot #8 for iPhone
iphone
ipad
watch
🧾$14.99
In-App Purchase↘︎
📌Ready
Reviews summary↘︎
⭐59
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📝1+ tags
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🔄6+ apps
Alternatives↘︎
❓5 answered
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📦~ in 3 days
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About

This interval timer app enhances various workouts like HIIT, Tabata, and yoga with intuitive design and customizable timer modes. Create and save custom intervals, track calorie expenditure, and sync settings across devices, including Apple Watch.

✓Customizable interval timers
✓Simple and advanced timer modes
✓Create and save multiple workout settings
✓Apple Watch compatibility with heart monitor
✓Automatic calorie tracking to Apple Health
✓Cross-device sync
Show original description

What users say

Summarized from real user reviews of HIIT Interval Timer | Cero. Based on 435 reviews and a 4.7/5 average, it highlights the 8 positives and 6 negatives reviewers mention most about this Health & Fitness app.

Positive things

  • 👍Simple and straightforward
  • 👍Very practical and customizable
  • 👍Great for HIIT and Tabata
  • 👍Clear design and easy to use
  • 👍Good value, no subscription
  • 👍Works as expected
  • 👍Versatile for various workouts
  • 👍Intuitive and functional

Negative things

  • 🔋Drains battery
  • 🎶Music playback interrupted
  • ⚠️Ads interrupt timers
  • 🔊Weak or non-functional sound/haptics
  • 🔄Forced updates
  • 🧭Back button change on Apple Watch
See all reviews

What's New in HIIT Interval Timer | Cero

4.2.1

September 28, 2026

Cero 4.2 makes your progress easier to see and share: • New workout recaps show time, intervals, estimated calories, and heart rate when available. Share your recap as an image. • The stopwatch now charts laps live and shows lap insights. Sessions are saved when you reset, with history you can export as PDF or CSV. • Advanced timers have clearer interval bars and progress, plus refreshed setup screens and timer cards. • Manage Live Activities in Settings on supported devices. Privacy choices and other controls are clearer, too.

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Subscriptions & In-App Purchases

Cero Pro Monthly

Remove ads and unlock all Pro features for one month.

$2.991 Month
7 Days trial
How to cancel HIIT Interval Timer | Cero subscription ⁉️

User reviews

Most RecentHighest RatedLowest Rated

평생이용 결제 했는데 앱을 바꿔버리네

아니 PRO앱 평생이용 결재해서 쓰고 있는데 갑자기 해당지역에서 사용이 제한된다고 나오고 다시 기본앱에서 PRO결재하라고 하는 건 무슨 경우야?
리뷰어562리뷰어562

Response from developer

안녕하세요! 저희 앱에는 지역 제한이 없으며 전 세계 어디에서나 사용하실 수 있습니다. 결제 화면(paywall)에서 **구독 복원(Restore Subscriptions)** 버튼을 눌러 주세요. 문제가 계속된다면 support@cero.app 으로 문의해 주세요. 감사합니다!

Cero

Dommage que l'on puisse pas changer le nom des exercices
TttttrrexxfcTttttrrexxfc

Excellent

Works as it should.
AndyxgtAndyxgt

Response from developer

Thank you so much for your feedback! 💚

Ads interrupt timers

Why would I bother with this?
SarcasmCheckSarcasmCheck

Parfait

L’application est très bien faite, tant visuellement, que dans sa compréhension
PlflampePlflampe
See 54 more reviews

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User experience

🐞

Reported Bugs

4 issues

App runs in background draining battery

Bug

Rotation broke after update

Bug

Apple workout app overrides Cero app on Apple Watch

Bug

Interval signals too weak or not working

Bug
✨

Requested Features

5 requests

Ability to group timers

Feature

Option to add warm-up and cool-down features

Feature

Ability to type numbers for time adjustment

Feature

Timer sounds through headphones or interrupting music

Feature

Ability to change exercise names

Feature

FAQ

What does the Interval Timer | Cero app do?

This app serves as a versatile interval timer designed to enhance a wide range of workouts, including HIIT, Tabata, running, yoga, and strength training. It offers intuitive controls and customizable features to help users manage their workout intervals effectively.

What are the key features of Cero?

Key features include simple and advanced timer modes, the ability to create and save custom intervals with unique icons and colors, automatic calorie expenditure tracking to Apple Health, and seamless syncing of timers and settings across all your devices. It also offers Apple Watch compatibility with a heart monitor.

Is Cero free to use?

The app is free to download and use, offering a robust set of features. It also includes in-app purchases, suggesting that some advanced functionalities or customization options might be available for purchase.

What devices is Cero compatible with?

Cero is designed for use on iOS devices and is also compatible with Apple Watch, providing a heart monitor for outdoor activities. The app automatically syncs settings across all your devices, ensuring a consistent experience.

How can Cero help with my workouts?

Cero helps users stay on track with their fitness goals by providing a clear and customizable interval timer. Whether you're doing HIIT, Tabata, or yoga, the app allows you to set up precise intervals, track your progress, and monitor calorie expenditure, making your workouts more efficient and effective.