# Interval Timer vs HIIT Interval Timer | Cero

The clearest difference is ads: Interval Timer at none against HIIT Interval Timer | Cero's shown. HIIT Interval Timer | Cero's advantage is update cadence (every 3 days vs every 4 weeks). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Interval Timer sells 4 in-app purchases, starting at $1.99 per month 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 — 4.7 for Interval Timer against 4.7 for HIIT Interval Timer | Cero. Both are backed by a comparable volume of ratings — 534 and 435 respectively. Written reviews are what separate them: 77% of Interval Timer's written reviews are positive against 75% of HIIT Interval Timer | Cero's.

Interval Timer ships an update every 4 weeks, HIIT Interval Timer | Cero every 3 days. The most recent releases landed on October 4, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Interval Timer | HIIT Interval Timer | Cero |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (534 ratings)](https://appshunter.io/ios/app/interval-timer-bit-timer/id505848680/reviews)** | [4.7 (435 ratings)](https://appshunter.io/ios/app/hiit-interval-timer-cero/id1256319392/reviews) |
| Number of ratings | **534** | 435 |
| Positive reviews | **76.8% of reviews** | 74.6% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 weeks | **Every 3 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 15 MB | 42 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Peiter Buick](https://appshunter.io/developer/505848683) | [Flawless Studio LLC](https://appshunter.io/developer/1228312508) |

## What reviewers say

### Interval Timer

[App page](https://appshunter.io/ios/app/interval-timer-bit-timer/id505848680)

This app provides a simple and intuitive interval timer for workouts like HIIT, EMOM, and CrossFit. It features quick setup, guiding tones and colors, and background functionality to keep you focused on your training.

**Highlights:** Instant interval setup, Guiding tones and colors, HealthKit integration, Background functionality, Save and sync favorite timers, Preparation countdown, Pause and resume workouts

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Bit Timer Pro | $1.99 | per month |
| Bit Timer Pro | $4.99 | per year |
| Bit Timer Pro | $9.99 | per year |
| Bit Timer Pro Lifetime | $17.99 | one-time |

**What reviewers like**

- 🚀 Simple and easy to use
- 👍 Elegant and intuitive design
- ✨ Effective for interval training
- 💯 Works great for the basics

**What reviewers complain about**

- 🔒 Paid app now requires subscription
- 💰 Asking users to pay again after initial purchase
- 🔇 Audio cues too quiet
- ⏱️ Limited to 4 minutes of work time

**Reported bugs**

- Timer continues counting down even after app is closed
- Issues with music volume reduction while app is in use

**Requested features**

- Ability to save and load custom workout routines
- Option to increase work interval duration beyond 4 minutes
- Apple Watch app integration
- More sound effect options


### 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 Interval Timer free?

Interval Timer 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, Interval Timer or HIIT Interval Timer | Cero?

Interval Timer is rated higher. Interval Timer averages 4.7 out of 5 from 534 ratings, while HIIT Interval Timer | Cero averages 4.7 from 435 ratings.

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

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

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

Interval Timer ships an update every 4 weeks, and HIIT Interval Timer | Cero every 3 days. Most recently, Interval Timer was updated on October 4, 2026 and HIIT Interval Timer | Cero on October 7, 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.*