# HIIT Interval Timer | Cero vs Interval timer · Hiit timer

The clearest difference is ratings volume: HIIT Interval Timer | Cero at 435 against Interval timer · Hiit timer's 16. HIIT Interval Timer | Cero also leads on update cadence (every 3 days vs weekly). Interval timer · Hiit timer's advantage is iOS requirement (14.0 vs 16.0). On price, rating, 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 · Hiit timer sells 3 in-app purchases, starting at $2.99 per 7 days. 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 · Hiit timer. That said, the two scores are not equally well evidenced: HIIT Interval Timer | Cero has 435 ratings behind it against 16, so its average is the more settled of the two.

HIIT Interval Timer | Cero ships an update every 3 days, Interval timer · Hiit timer weekly. The most recent releases landed on September 29, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | HIIT Interval Timer | Cero | Interval timer · Hiit timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (435 ratings)](https://appshunter.io/ios/app/hiit-interval-timer-cero/id1256319392/reviews) | **[4.8 (16 ratings)](https://appshunter.io/ios/app/interval-timer-hiit-timer/id6479285382/reviews)** |
| Number of ratings | **435** | 16 |
| Positive reviews | 74.6% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Weekly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 42 MB | 82 MB |
| Requires iOS | 16.0 | **14.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Flawless Studio LLC](https://appshunter.io/developer/1228312508) | [UnitVN.,JSC](https://appshunter.io/developer/1639973914) |

## 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 · Hiit timer

[App page](https://appshunter.io/ios/app/interval-timer-hiit-timer/id6479285382)

This workout app offers customizable interval and rest times, with audio guidance that continues even when the app is in the background. Track your progress with detailed history and statistics, and easily repeat past workouts. It's designed to enhance your fitness routine without interrupting your music.

**Highlights:** Customizable interval and rest times, Audio guidance (voice or beeps), Background audio support, Workout history and statistics, Repeat previous workouts, Non-interference with music

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $2.99 | per 7 days |
| Premium Monthly | $4.99 | per month |
| Lifetime package | $19.99 | 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 · Hiit timer free?

Interval timer · Hiit timer is free to download, with in-app purchases available.

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

Interval timer · Hiit timer is rated higher. HIIT Interval Timer | Cero averages 4.7 out of 5 from 435 ratings, while Interval timer · Hiit timer averages 4.8 from 16 ratings.

### Do HIIT Interval Timer | Cero or Interval timer · Hiit timer have ads?

Both HIIT Interval Timer | Cero and Interval timer · Hiit timer show ads.

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

HIIT Interval Timer | Cero ships an update every 3 days, and Interval timer · Hiit timer weekly. Most recently, HIIT Interval Timer | Cero was updated on September 29, 2026 and Interval timer · Hiit timer on October 1, 2026.

---

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