# HIIT Interval Timer | Cero

> Tabata, Gym & Boxing Workout

Canonical page: [https://chrome-stats.com/d/id1256319392](https://chrome-stats.com/d/id1256319392)

## Overview

- **ID:** `id1256319392`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Flawless Studio LLC
- **Category:** Health & Fitness
- **Rating:** 4.70 / 5 (435 ratings)
- **Version:** 4.1.2
- **Last updated:** 2026-09-18
- **First published:** 2017-07-15
- **Size:** 42 MB
- **Data as of:** 2026-09-21
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/hiit-interval-timer-cero/id1256319392)
- **Website:** [http://cero.app](http://cero.app/)
- **Privacy policy:** [https://cero.app/terms](https://cero.app/terms)

## Description

**Cero** is a flexible interval timer for HIIT, Tabata, circuit training, WODs, EMOM workouts, boxing rounds, indoor cycling and HYROX preparation. Create simple work-and-rest timers or detailed sessions with custom intervals, warm-ups, cool-downs, sets, colors, icons and intensity levels.

Stay focused with large controls, reliable audio and voice cues, vibrations, interval music, Live Activities, Dynamic Island support, Home Screen widgets, Siri and Shortcuts. Use Gym Display on a larger screen, share workouts by file or QR code, and access saved sessions from Apple Watch. Adaptive HR can adjust recovery based on your target heart rate and provide effort alerts using Apple Watch or a compatible Bluetooth monitor. Cero also includes a countdown, lap stopwatch, workout history, Apple Health integration and automatic iCloud backups.

## Rankings

- #76,804 — Overall

## Review summary

Users praise Interval Timer | Cero for its versatility and ease of use, plus a welcome one-time price. It’s widely viewed as a top interval timer for HIIT and related routines. Recurring drawbacks include ads and forced updates, battery drain, weak end-of-interval alerts on devices, and usability gaps such as lack of background music support and typing time values rather than using plus/minus.

### Pros

- Versatile and feature-rich timer suitable for HIIT, Tabata, AMRAP, EMOM, and more.
- Easy to set up, customize, and name timers with a clean, intuitive UI.
- One-time purchase price with no mandatory subscription.
- Reliable performance and strong user reputation; many call it the best interval timer.
- Good value with extensive settings, even in the free version.

### Cons

- Ads appear after updates or force updates, which can be off-putting.
- Battery drain/background usage when the app runs.
- Cannot listen to music in the background while using the timer.
- End-of-interval alerts (beep/haptic) can be weak or inaudible on phone/watch.
- Time entry is cumbersome (plus/minus only; would like to type numbers) and occasional UI quirks like landscape rotation after updates.

## Similar extensions and apps

- [Tabata & HIIT Timer | Cero Pro](https://chrome-stats.com/d/id1569959638) — 3.00 / 5
- [Interval Timer+++](https://chrome-stats.com/d/id6483931744) — 5.00 / 5
- [Interval Timer: Custom Timer](https://chrome-stats.com/d/id6757408795)
- [Intervalio: Interval Timer](https://chrome-stats.com/d/id6760857994)
- [Interval timer - Intervalo](https://chrome-stats.com/d/id6760371714)
- [Interval Timer: Workout HIIT](https://chrome-stats.com/d/id6756293115)
- [Interval Timer HIIT](https://chrome-stats.com/d/id6760827440)
- [Interval Timer: HIIT Tabata](https://chrome-stats.com/d/id6755321377) — 4.70 / 5
- [Interval Timer Free - Workout](https://chrome-stats.com/d/id6749876500) — 4.40 / 5
- [Modern Interval Workout Timer](https://chrome-stats.com/d/id6733239641) — 3.00 / 5
- [Standard Interval Timer](https://chrome-stats.com/d/id1458273977) — 4.80 / 5
- [HIIT Workout: Interval Timer](https://chrome-stats.com/d/id1664899160) — 4.80 / 5

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Source: [Chrome-Stats](https://chrome-stats.com/d/id1256319392)