# HIIT Interval Timer | Cero vs Best Interval Timer

The clearest difference is rating: HIIT Interval Timer | Cero at 4.7 against Best Interval Timer's 3.5. HIIT Interval Timer | Cero also leads on ratings volume (435 vs 10). Best Interval Timer's advantage is ads (none vs shown) and review sentiment (100% vs 75%). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. HIIT Interval Timer | Cero sells 2 in-app purchases, starting at $2.99 per month and Best Interval Timer sells 2 in-app purchases, starting at $4.99 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 3.5. That said, the two scores are not equally well evidenced: HIIT Interval Timer | Cero has 435 ratings behind it against 10, so its average is the more settled of the two. Written reviews complicate that: 75% of HIIT Interval Timer | Cero's written reviews are positive against 100% of Best Interval Timer's, so the app with the better star average is not the one people write more warmly about.

HIIT Interval Timer | Cero ships an update every 3 days, Best Interval Timer every 6 days. The most recent releases landed on October 12, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | HIIT Interval Timer | Cero | Best Interval Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (435 ratings)](https://appshunter.io/ios/app/hiit-interval-timer-cero/id1256319392/reviews)** | [3.5 (10 ratings)](https://appshunter.io/ios/app/best-interval-timer-workout/id1514625587/reviews) |
| Number of ratings | **435** | 10 |
| Positive reviews | 74.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Every 6 days |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 43 MB | 31 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Flawless Studio LLC](https://appshunter.io/developer/1228312508) | [Quang Huy Vo](https://appshunter.io/developer/1558345571) |

## 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 (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


### Best Interval Timer

[App page](https://appshunter.io/ios/app/best-interval-timer-workout/id1514625587)

This app helps you manage workout intervals with customizable exercise, rest, and round durations. It provides audio and visual cues to guide you through your training sessions, whether at home, the gym, or outdoors. Perfect for various fitness activities like HIIT, cycling, and weightlifting.

**Highlights:** Customizable exercise, rest, and round durations, Audio and visual interval cues, Supports HIIT, cycling, running, weightlifting, and more, Pause functionality during rest periods, Adjustable number of sets and countdown time

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Support we $4.99/month | $4.99 | per month |
| Billed yearly | $26.99 | per year |


## Frequently asked questions

### Is HIIT Interval Timer | Cero free?

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

### Is Best Interval Timer free?

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

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

HIIT Interval Timer | Cero is rated higher. HIIT Interval Timer | Cero averages 4.7 out of 5 from 435 ratings, while Best Interval Timer averages 3.5 from 10 ratings.

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

HIIT Interval Timer | Cero shows ads; Best Interval Timer does not.

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

HIIT Interval Timer | Cero ships an update every 3 days, and Best Interval Timer every 6 days. Most recently, HIIT Interval Timer | Cero was updated on October 12, 2026 and Best Interval Timer on October 13, 2026.

---

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