# HIIT Interval Timer | Cero vs Intervals

The clearest difference is rating: HIIT Interval Timer | Cero at 4.7 against Intervals's 4.3. HIIT Interval Timer | Cero also leads on update cadence (every 3 days vs every 3 weeks) and ratings volume (435 vs 9). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. HIIT Interval Timer | Cero sells 1 one-off in-app purchase and Intervals sells 4 in-app purchases, starting at $0.99 per month. 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 4.3. That said, the two scores are not equally well evidenced: HIIT Interval Timer | Cero has 435 ratings behind it against 9, so its average is the more settled of the two.

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

## The numbers

| Metric | HIIT Interval Timer | Cero | Intervals |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (435 ratings)](https://appshunter.io/ios/app/hiit-interval-timer-cero/id1256319392/reviews)** | [4.3 (9 ratings)](https://appshunter.io/ios/app/intervals-hiit-and-tabata-timer/id6742316650/reviews) |
| Number of ratings | **435** | 9 |
| Positive reviews | 74.6% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 42 MB | 20 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad, Apple Watch | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Flawless Studio LLC](https://appshunter.io/developer/1228312508) | [Mozi SW Info](https://appshunter.io/developer/1797720828) |

## 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


### Intervals

[App page](https://appshunter.io/ios/app/intervals-hiit-and-tabata-timer/id6742316650)

This app provides a customizable timer for high-intensity interval training, Tabata, and circuit workouts. It offers voice guidance, workout history tracking, and multiple sound alerts to enhance your fitness routine. Designed for all fitness levels and workout styles, it helps you stay focused and achieve your goals.

**Highlights:** Customizable workout and rest intervals, Workout history and calendar view, Voice guidance for workouts, Multiple sound alerts, Simple and intuitive interface, Supports various workout styles

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.99 | per month |
| Yearly | $5.99 | per year |
| Lifetime limited time offer | $9.99 | one-time |
| Lifetime Subscription | $12.99 | 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 Intervals free?

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

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

HIIT Interval Timer | Cero is rated higher. HIIT Interval Timer | Cero averages 4.7 out of 5 from 435 ratings, while Intervals averages 4.3 from 9 ratings.

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

Both HIIT Interval Timer | Cero and Intervals show ads.

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

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