# Interval Timer for HIIT | Cero vs Interval Timer Pro+

The clearest difference is review sentiment: Interval Timer for HIIT | Cero at 75% against Interval Timer Pro+'s 0%. Interval Timer for HIIT | 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) and iOS requirement (15.0 vs 18.0). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Interval Timer for HIIT | 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.

Interval Timer for HIIT | Cero holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: Interval Timer for HIIT | Cero has 438 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 75% of Interval Timer for HIIT | Cero's written reviews are positive against 0% of Interval Timer Pro+'s.

Interval Timer for HIIT | Cero ships an update every 3 days, Interval Timer Pro+ every 3 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Interval Timer for HIIT | Cero | Interval Timer Pro+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (438 ratings)](https://appshunter.io/ios/app/interval-timer-for-hiit-cero/id1256319392/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/interval-timer-pro-plus/id1559020398/reviews) |
| Number of ratings | **438** | 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 | 50 MB | 28 MB |
| Requires iOS | 18.0 | **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

### Interval Timer for HIIT | Cero

[App page](https://appshunter.io/ios/app/interval-timer-for-hiit-cero/id1256319392)

Create custom interval workouts for HIIT, Tabata, and circuit training. Features adaptive heart rate training, Siri integration, and Apple Watch support. Track progress and share your custom routines.

**Highlights:** Customizable interval programming, Adaptive heart rate training, Siri and Shortcuts integration, Apple Watch app, Workout history and sharing, Live Activities and Dynamic Island support

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support, iPhone Duo 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 Interval Timer for HIIT | Cero free?

Interval Timer for HIIT | 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, Interval Timer for HIIT | Cero or Interval Timer Pro+?

Interval Timer for HIIT | Cero is rated higher. Interval Timer for HIIT | Cero averages 4.7 out of 5 from 438 ratings, while Interval Timer Pro+ averages 1.0 from 1 ratings.

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

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

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

Interval Timer for HIIT | Cero ships an update every 3 days, and Interval Timer Pro+ every 3 months. Most recently, Interval Timer for HIIT | Cero was updated on November 6, 2026 and Interval Timer Pro+ on November 3, 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.*