# HIIT Interval Timer | Cero vs Interval Timer

The clearest difference is update cadence: HIIT Interval Timer | Cero at every 3 days against Interval Timer's every 2 months. Interval Timer's advantage is rating (4.9 vs 4.7) and review sentiment (84% vs 75%). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

Interval Timer holds the better App Store score, 4.9 against 4.7. Both are backed by a comparable volume of ratings — 435 and 246 respectively. Written reviews point the same way: 75% of HIIT Interval Timer | Cero's written reviews are positive against 84% of Interval Timer's.

HIIT Interval Timer | Cero ships an update every 3 days, Interval Timer every 2 months. The most recent releases landed on September 29, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | HIIT Interval Timer | Cero | Interval Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (435 ratings)](https://appshunter.io/ios/app/hiit-interval-timer-cero/id1256319392/reviews) | **[4.9 (246 ratings)](https://appshunter.io/ios/app/interval-timer-hiit-workout/id1596127692/reviews)** |
| Number of ratings | **435** | 246 |
| Positive reviews | 74.6% of reviews | **83.5% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 42 MB | 12 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad, Apple Watch | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Flawless Studio LLC](https://appshunter.io/developer/1228312508) | [Yosyp Hameliak](https://appshunter.io/developer/895008826) |

## 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

[App page](https://appshunter.io/ios/app/interval-timer-hiit-workout/id1596127692)

This interval timer is designed for HIIT and interval training. Easily set work and rest periods, sets, and rounds to guide your workouts. It supports background operation and music playback, with an Apple Watch companion app for heart rate monitoring.

**Highlights:** Customizable work and rest periods, Set number of sets and rounds, Background operation support, Music playback compatibility, Apple Watch integration, Heart rate monitoring (Apple Watch)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $4.99 | one-time |


## 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 free?

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

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

Interval Timer is rated higher. HIIT Interval Timer | Cero averages 4.7 out of 5 from 435 ratings, while Interval Timer averages 4.9 from 246 ratings.

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

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

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

HIIT Interval Timer | Cero ships an update every 3 days, and Interval Timer every 2 months. Most recently, HIIT Interval Timer | Cero was updated on September 29, 2026 and Interval Timer on September 28, 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.*