# HIIT Interval Timer | Cero vs Interval Timer

The clearest difference is review sentiment: HIIT Interval Timer | Cero at 75% against Interval Timer's 0%. Interval Timer's advantage is ads (none vs shown) and update cadence (daily vs every 3 days). 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 sells 8 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

HIIT Interval Timer | Cero ships an update every 3 days, Interval Timer daily. The most recent releases landed on October 16, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | HIIT Interval Timer | Cero | Interval Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (435 ratings)](https://appshunter.io/ios/app/hiit-interval-timer-cero/id1256319392/reviews)** | — |
| Number of ratings | **435** | — |
| Positive reviews | **74.6% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 days | **Daily** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 42 MB | 22 MB |
| Requires iOS | 16.0 | **11.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Flawless Studio LLC](https://appshunter.io/developer/1228312508) | [Samantha Roobol](https://appshunter.io/developer/1415281405) |

## 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

[App page](https://appshunter.io/ios/app/interval-timer-hiit-and-tabata/id1463571104)

This customizable timer is perfect for interval training, including HIIT and Tabata workouts. Easily program sets, cycles, and work-to-rest ratios for efficient exercise. Includes pre-set workouts and 30-day programs for fat burning and fitness.

**Highlights:** Customizable sets, cycles, and work-to-rest ratios, HIIT and Tabata workout support, Pre-set workouts included, 30-day workout programs, Suitable for bodyweight exercises, Time-efficient training

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads | $0.99 | one-time |
| Lose Weight In 30 Days | $1.99 | one-time |
| Abs, Butt and Thighs | $1.99 | one-time |
| Upper Body Muscle Building | $1.99 | one-time |
| Total Body Activation | $1.99 | one-time |
| Burn Belly Fat | $1.99 | one-time |
| Yoga for Weight Loss | $1.99 | one-time |
| Full Bundle | $4.99 | 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 free?

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

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

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

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

HIIT Interval Timer | Cero ships an update every 3 days, and Interval Timer daily. Most recently, HIIT Interval Timer | Cero was updated on October 16, 2026 and Interval Timer on September 18, 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.*