# HIIT Interval Timer | Cero vs Interval Timer Pro+

The clearest difference is review sentiment: HIIT Interval Timer | Cero at 75% against Interval Timer Pro+'s 0%. HIIT Interval Timer | Cero also leads on rating (4.7 vs 1.0) and update cadence (every 3 days vs every 3 months). Interval Timer Pro+'s advantage is ads (none vs shown). 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 2 in-app purchases, starting at $2.99 per month and Interval Timer Pro+ sells 1 one-off in-app purchase. 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 1.0. 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 0% of Interval Timer Pro+'s.

HIIT Interval Timer | Cero ships an update every 3 days, Interval Timer Pro+ every 3 months. The most recent releases landed on October 16, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | HIIT Interval Timer | Cero | Interval Timer Pro+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (435 ratings)](https://appshunter.io/ios/app/hiit-interval-timer-cero/id1256319392/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/interval-timer-pro-plus/id1559020398/reviews) |
| Number of ratings | **435** | 1 |
| Positive reviews | **74.6% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Every 3 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 42 MB | 27 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) | [Karolis Raiselis](https://appshunter.io/developer/1442359782) |

## 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


### Interval Timer Pro+

[App page](https://appshunter.io/ios/app/interval-timer-pro-plus/id1559020398)

This app guides you through interval-based workouts, including Tabata and HIIT, with clear instructions for exercises, rest periods, and rounds. It offers workout history and integrates with Apple Watch for calorie and heart rate tracking.

**Highlights:** Simple workout setup, Advanced workout creation, Exercise naming and warmup, Workout history tracking, Apple Watch integration, Health app integration

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to Premium | $1.99 | 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 Pro+ free?

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

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

HIIT Interval Timer | Cero is rated higher. HIIT Interval Timer | Cero averages 4.7 out of 5 from 435 ratings, while Interval Timer Pro+ averages 1.0 from 1 ratings.

### Do HIIT Interval Timer | Cero or Interval Timer Pro+ have ads?

HIIT Interval Timer | Cero shows ads; Interval Timer Pro+ does not.

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

HIIT Interval Timer | Cero ships an update every 3 days, and Interval Timer Pro+ every 3 months. Most recently, HIIT Interval Timer | Cero was updated on October 16, 2026 and Interval Timer Pro+ on October 2, 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.*