# HIIT Interval Timer | Cero vs Interval Timer X Workout Timer

The clearest difference is update cadence: HIIT Interval Timer | Cero at every 3 days against Interval Timer X Workout Timer's every 6 weeks. Interval Timer X Workout Timer's advantage is review sentiment (94% vs 75%). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. HIIT Interval Timer | Cero sells 1 one-off in-app purchase and Interval Timer X Workout Timer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for HIIT Interval Timer | Cero against 4.8 for Interval Timer X Workout Timer. Both are backed by a comparable volume of ratings — 435 and 686 respectively. Written reviews are what separate them: 75% of HIIT Interval Timer | Cero's written reviews are positive against 94% of Interval Timer X Workout Timer's.

HIIT Interval Timer | Cero ships an update every 3 days, Interval Timer X Workout Timer every 6 weeks. Both last shipped on September 29, 2026.

## The numbers

| Metric | HIIT Interval Timer | Cero | Interval Timer X Workout Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (435 ratings)](https://appshunter.io/ios/app/hiit-interval-timer-cero/id1256319392/reviews) | **[4.8 (686 ratings)](https://appshunter.io/ios/app/interval-timer-x-workout-timer/id1448144846/reviews)** |
| Number of ratings | 435 | **686** |
| Positive reviews | 74.6% of reviews | **93.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Every 6 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 42 MB | 45 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Flawless Studio LLC](https://appshunter.io/developer/1228312508) | [世恬 颜](https://appshunter.io/developer/1448144845) |

## What reviewers say

### HIIT Interval Timer | Cero

[App page](https://appshunter.io/ios/app/hiit-interval-timer-cero/id1256319392)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cero Pro | $3.99 | one-time |

**What reviewers like**

- 👍 Simple and straightforward
- 👍 Very practical and customizable
- 👍 Great for HIIT and Tabata
- 👍 Clear design and easy to use
- 👍 Good value, no subscription

**What reviewers complain about**

- 🔋 Drains battery
- 🎶 Music playback interrupted
- ⚠️ Ads interrupt timers
- 🔊 Weak or non-functional sound/haptics
- 🔄 Forced updates

**Reported bugs**

- App runs in background draining battery
- Rotation broke after update
- Apple workout app overrides Cero app on Apple Watch
- Interval signals too weak or not working

**Requested features**

- Ability to group timers
- Option to add warm-up and cool-down features
- Ability to type numbers for time adjustment
- Timer sounds through headphones or interrupting music
- Ability to change exercise names


### Interval Timer X Workout Timer

[App page](https://appshunter.io/ios/app/interval-timer-x-workout-timer/id1448144846)

This versatile timer helps you structure workouts, manage daily tasks, and achieve fitness goals. Customize routines, track progress with visual cues, and stay motivated with customizable sounds. Ideal for HIIT, Tabata, yoga, and more.

**Highlights:** Customizable workout routines, Standalone interval timer/counter, Routine combination feature, Customizable warning sounds, Intuitive interface with dark mode, Background usage support, Workout summary and history

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Interval Timer X Premium | $6.99 | one-time |

**What reviewers like**

- 🚀 Interval timer
- 👍 Easy to use
- 👍 Customizable
- 👍 Useful for workouts
- 👍 Reliable

**What reviewers complain about**

- 💰 Ads in free version
- 🐛 Occasional bugs or crashes

**Reported bugs**

- Interval set index display issue
- Compatibility issues with older devices

**Requested features**

- Audio ducking for music playback
- Voice countdown
- Ability to store custom settings automatically
- Vibration option in addition to audio


## Frequently asked questions

### Is HIIT Interval Timer | Cero free?

HIIT Interval Timer | Cero is free to download, with in-app purchases available.

### Is Interval Timer X Workout Timer free?

Interval Timer X Workout Timer is free to download, with in-app purchases available.

### Which has better reviews, HIIT Interval Timer | Cero or Interval Timer X Workout Timer?

Interval Timer X Workout Timer is rated higher. HIIT Interval Timer | Cero averages 4.7 out of 5 from 435 ratings, while Interval Timer X Workout Timer averages 4.8 from 686 ratings.

### Do HIIT Interval Timer | Cero or Interval Timer X Workout Timer have ads?

Both HIIT Interval Timer | Cero and Interval Timer X Workout Timer show ads.

### Which is updated more often, HIIT Interval Timer | Cero or Interval Timer X Workout Timer?

HIIT Interval Timer | Cero ships an update every 3 days, and Interval Timer X Workout Timer every 6 weeks. Most recently, HIIT Interval Timer | Cero was updated on September 29, 2026 and Interval Timer X Workout Timer on September 29, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*