# HIIT Interval Timer | Cero vs Hi Timer

The clearest difference is ads: Hi Timer at none against HIIT Interval Timer | Cero's shown. Hi Timer also leads on review sentiment (100% vs 75%) and rating (5.0 vs 4.7). HIIT Interval Timer | Cero's advantage is update cadence (every 3 days vs every 3 weeks) and ratings volume (435 vs 1). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. HIIT Interval Timer | Cero sells 1 one-off in-app purchase and Hi Timer sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Hi Timer holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: HIIT Interval Timer | Cero has 435 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 75% of HIIT Interval Timer | Cero's written reviews are positive against 100% of Hi Timer's.

HIIT Interval Timer | Cero ships an update every 3 days, Hi Timer every 3 weeks. The most recent releases landed on September 25, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | HIIT Interval Timer | Cero | Hi Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (435 ratings)](https://appshunter.io/ios/app/hiit-interval-timer-cero/id1256319392/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hi-timer-interval-timer-hiit/id1642170838/reviews)** |
| Number of ratings | **435** | 1 |
| Positive reviews | 74.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 42 MB | 17 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Flawless Studio LLC](https://appshunter.io/developer/1228312508) | [Sophie Payne](https://appshunter.io/developer/1642170840) |

## 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


### Hi Timer

[App page](https://appshunter.io/ios/app/hi-timer-interval-timer-hiit/id1642170838)

Create and customize your own interval workouts with this intuitive timer app. Features include quick start templates, advanced customization, voice cues, and background operation. Seamlessly integrate with your music and save workouts to Apple Health.

**Highlights:** Customizable interval workouts, Quick start templates (Tabata), Drag & drop interface, Voice and sound cues, Background operation, Music integration, HealthKit integration

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hi Timer Premium Monthly | $0.99 | per month |
| Hi Timer Premium Yearly | $3.99 | per year |
| HiTimer Forever | $6.99 | 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 Hi Timer free?

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

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

Hi Timer is rated higher. HIIT Interval Timer | Cero averages 4.7 out of 5 from 435 ratings, while Hi Timer averages 5.0 from 1 ratings.

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

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

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

HIIT Interval Timer | Cero ships an update every 3 days, and Hi Timer every 3 weeks. Most recently, HIIT Interval Timer | Cero was updated on September 25, 2026 and Hi Timer on September 15, 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.*