# Interval Timer vs Interval Timer for HIIT | Cero

The clearest difference is ads: Interval Timer at none against Interval Timer for HIIT | Cero's shown. Interval Timer for HIIT | 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 Interval Timer for HIIT | 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 Interval Timer for HIIT | Cero. Both are backed by a comparable volume of ratings — 561 and 438 respectively. Written reviews are what separate them: 77% of Interval Timer's written reviews are positive against 75% of Interval Timer for HIIT | Cero's.

Interval Timer ships an update every 4 weeks, Interval Timer for HIIT | Cero every 3 days. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Interval Timer | Interval Timer for HIIT | Cero |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (561 ratings)](https://appshunter.io/ios/app/interval-timer-bit-timer/id505848680/reviews)** | [4.7 (438 ratings)](https://appshunter.io/ios/app/interval-timer-for-hiit-cero/id1256319392/reviews) |
| Number of ratings | **561** | 438 |
| 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 | 45 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


### Interval Timer for HIIT | Cero

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


## Frequently asked questions

### Is Interval Timer free?

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

### Is Interval Timer for HIIT | Cero free?

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

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

Interval Timer is rated higher. Interval Timer averages 4.7 out of 5 from 561 ratings, while Interval Timer for HIIT | Cero averages 4.7 from 438 ratings.

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

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

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

Interval Timer ships an update every 4 weeks, and Interval Timer for HIIT | Cero every 3 days. Most recently, Interval Timer was updated on November 1, 2026 and Interval Timer for HIIT | Cero on November 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.*