# HIIT Interval Timer vs HIIT Interval Timer | Cero

The clearest difference is rating: HIIT Interval Timer | Cero at 4.7 against HIIT Interval Timer's 4.2. HIIT Interval Timer | Cero also leads on update cadence (every 3 days vs every 5 months) and review sentiment (75% vs 53%). On price, ads, in-app purchases and monetization model there is nothing between them.

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

HIIT Interval Timer | Cero holds the better App Store score, 4.7 against 4.2. Both are backed by a comparable volume of ratings — 102 and 435 respectively. Written reviews point the same way: 53% of HIIT Interval Timer's written reviews are positive against 75% of HIIT Interval Timer | Cero's.

HIIT Interval Timer ships an update every 5 months, HIIT Interval Timer | Cero every 3 days. The most recent releases landed on September 17, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | HIIT Interval Timer | HIIT Interval Timer | Cero |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (102 ratings)](https://appshunter.io/ios/app/hiit-interval-timer/id980471893/reviews) | **[4.7 (435 ratings)](https://appshunter.io/ios/app/hiit-interval-timer-cero/id1256319392/reviews)** |
| Number of ratings | 102 | **435** |
| Positive reviews | 52.6% of reviews | **74.6% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 5 months | **Every 3 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 10 MB | 42 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Thang Nguyen](https://appshunter.io/developer/921360262) | [Flawless Studio LLC](https://appshunter.io/developer/1228312508) |

## What reviewers say

### HIIT Interval Timer

[App page](https://appshunter.io/ios/app/hiit-interval-timer/id980471893)

This app provides a flexible interval timer for high-intensity training. Customize workout cycles, rest periods, and receive color, voice, and sound navigation cues. It runs in the background and offers a built-in music player.

**Highlights:** Customizable interval and rest times, Background and screen-locked operation, Color, voice, and sound navigation, Built-in music player, Create and manage custom timers, Multiple themes

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Upgrade | $4.99 | one-time |


### 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


## Frequently asked questions

### Is HIIT Interval Timer free?

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

### Is HIIT Interval Timer | Cero free?

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

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

HIIT Interval Timer | Cero is rated higher. HIIT Interval Timer averages 4.2 out of 5 from 102 ratings, while HIIT Interval Timer | Cero averages 4.7 from 435 ratings.

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

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

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

HIIT Interval Timer ships an update every 5 months, and HIIT Interval Timer | Cero every 3 days. Most recently, HIIT Interval Timer was updated on September 17, 2026 and HIIT Interval Timer | Cero on September 25, 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.*