# Interval Timer for HIIT | Cero vs Boxing Timer PRO

The clearest difference is ads: Boxing Timer PRO at none against Interval Timer for HIIT | Cero's shown. Boxing Timer PRO also leads on review sentiment (100% vs 75%) and rating (5.0 vs 4.7). Interval Timer for HIIT | Cero's advantage is update cadence (every 3 days vs every 4 weeks) and ratings volume (436 vs 2). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Interval Timer for HIIT | Cero sells 2 in-app purchases, starting at $2.99 per month and Boxing Timer PRO sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Boxing Timer PRO holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Interval Timer for HIIT | Cero has 436 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 75% of Interval Timer for HIIT | Cero's written reviews are positive against 100% of Boxing Timer PRO's.

Interval Timer for HIIT | Cero ships an update every 3 days, Boxing Timer PRO every 4 weeks. The most recent releases landed on October 20, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Interval Timer for HIIT | Cero | Boxing Timer PRO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (436 ratings)](https://appshunter.io/ios/app/interval-timer-for-hiit-cero/id1256319392/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/boxing-timer-pro-smartwod/id6739137459/reviews)** |
| Number of ratings | **436** | 2 |
| Positive reviews | 74.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Every 4 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 42 MB | 54 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Flawless Studio LLC](https://appshunter.io/developer/1228312508) | [Ilia Kulbakin](https://appshunter.io/developer/1783785490) |

## What reviewers say

### Interval Timer for HIIT | Cero

[App page](https://appshunter.io/ios/app/interval-timer-for-hiit-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 (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cero Pro Monthly | $2.99 | per month |
| Cero Pro | $14.99 | 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


### Boxing Timer PRO

[App page](https://appshunter.io/ios/app/boxing-timer-pro-smartwod/id6739137459)

This app provides a customizable interval timer for high-intensity interval training (HIIT) and boxing workouts. Easily set rounds, work/rest times, and even name custom exercises. Save and edit your workout presets to track progress and adapt to your fitness level.

**Highlights:** Customizable rounds and work/rest times, Pro mode for individual exercise duration, Unique sound options, Background operation without music interruption, Save and edit workout presets, Landscape mode support

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month | $4.99 | per month |
| 6 Months | $14.99 | per 6 months |
| Annual | $24.99 | per year |


## Frequently asked questions

### Is Interval Timer for HIIT | Cero free?

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

### Is Boxing Timer PRO free?

Boxing Timer PRO is free to download, with in-app purchases available.

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

Boxing Timer PRO is rated higher. Interval Timer for HIIT | Cero averages 4.7 out of 5 from 436 ratings, while Boxing Timer PRO averages 5.0 from 2 ratings.

### Do Interval Timer for HIIT | Cero or Boxing Timer PRO have ads?

Interval Timer for HIIT | Cero shows ads; Boxing Timer PRO does not.

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

Interval Timer for HIIT | Cero ships an update every 3 days, and Boxing Timer PRO every 4 weeks. Most recently, Interval Timer for HIIT | Cero was updated on October 20, 2026 and Boxing Timer PRO on October 4, 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.*