# Circuit Training Timer Lite vs HIIT Interval Timer | Cero

The clearest difference is ads: Circuit Training Timer Lite at none against HIIT Interval Timer | Cero's shown. Circuit Training Timer Lite also leads on review sentiment (85% vs 75%) and iOS requirement (12.0 vs 16.0). HIIT Interval Timer | Cero's advantage is update cadence (every 3 days vs every 6 weeks). On price, rating, ratings volume and in-app purchases there is nothing between them.

Both are free to download. Circuit Training Timer Lite sells 3 one-off in-app purchases and HIIT Interval Timer | Cero sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.8 for Circuit Training Timer Lite against 4.7 for HIIT Interval Timer | Cero. Both are backed by a comparable volume of ratings — 468 and 435 respectively. Written reviews are what separate them: 85% of Circuit Training Timer Lite's written reviews are positive against 75% of HIIT Interval Timer | Cero's.

Circuit Training Timer Lite ships an update every 6 weeks, HIIT Interval Timer | Cero every 3 days. The most recent releases landed on October 11, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Circuit Training Timer Lite | HIIT Interval Timer | Cero |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (468 ratings)](https://appshunter.io/ios/app/circuit-training-timer-lite/id903631807/reviews)** | [4.7 (435 ratings)](https://appshunter.io/ios/app/hiit-interval-timer-cero/id1256319392/reviews) |
| Number of ratings | **468** | 435 |
| Positive reviews | **84.6% of reviews** | 74.6% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 3 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 36 MB | 43 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [DenciSoft s.r.o.](https://appshunter.io/developer/583724967) | [Flawless Studio LLC](https://appshunter.io/developer/1228312508) |

## What reviewers say

### Circuit Training Timer Lite

[App page](https://appshunter.io/ios/app/circuit-training-timer-lite/id903631807)

This app coaches your workouts with customizable timers, allowing you to focus on training. It supports location tracking for detailed statistics and heart rate monitoring with Bluetooth LE devices. Voice coaching and clear visual cues keep you informed without needing to check your screen.

**Highlights:** Customizable interval timers, Location tracking for stats, Bluetooth LE heart rate monitor support, Voice coaching and notifications, Workout history tracking, iCloud synchronization

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |
| Unlimited Timers | $1.99 | one-time |
| Full Version | $2.99 | one-time |

**What reviewers like**

- 👍 Highly customizable workouts
- 🎶 Music integration
- ⏱️ Flexible timer settings
- 🔊 Voice prompts for exercises
- 📚 Saved workout routines

**What reviewers complain about**

- 🔋 Battery drain issues
- 🔒 Limited functionality in free version
- 🔇 Quiet audio prompts
- 📈 Lack of workout history/progress tracking

**Reported bugs**

- Playlist sync issues
- App crashes when phone is locked

**Requested features**

- Ability to share workout routines
- Integration with fitness tracking apps
- More advanced statistics and analytics
- Apple Watch app support


### 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


## Frequently asked questions

### Is Circuit Training Timer Lite free?

Circuit Training Timer Lite is free to download, with in-app purchases available.

### Is HIIT Interval Timer | Cero free?

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

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

Circuit Training Timer Lite is rated higher. Circuit Training Timer Lite averages 4.8 out of 5 from 468 ratings, while HIIT Interval Timer | Cero averages 4.7 from 435 ratings.

### Do Circuit Training Timer Lite or HIIT Interval Timer | Cero have ads?

HIIT Interval Timer | Cero shows ads; Circuit Training Timer Lite does not.

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

Circuit Training Timer Lite ships an update every 6 weeks, and HIIT Interval Timer | Cero every 3 days. Most recently, Circuit Training Timer Lite was updated on October 11, 2026 and HIIT Interval Timer | Cero on October 12, 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.*