# Interval Timer for HIIT | Cero vs Interval Timer

The clearest difference is update cadence: Interval Timer for HIIT | Cero at every 3 days against Interval Timer's every 2 months. Interval Timer's advantage is iOS requirement (15.1 vs 18.0). On price, ads, in-app purchases 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 sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Interval Timer for HIIT | Cero ships an update every 3 days, Interval Timer every 2 months. The most recent releases landed on November 11, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Interval Timer for HIIT | Cero | Interval Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (441 ratings)](https://appshunter.io/ios/app/interval-timer-for-hiit-cero/id1256319392/reviews)** | — |
| Number of ratings | **441** | — |
| Positive reviews | 74.6% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 59 MB | 62 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Flawless Studio LLC](https://appshunter.io/developer/1228312508) | [Jayendra Parmar](https://appshunter.io/developer/6779231390) |

## 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. This app offers detailed programming with custom intervals, colors, and icons. Stay focused with large controls, clear cues, and optional heart rate training.

**Highlights:** Customizable interval programming, Heart rate training integration, Live Activities and Dynamic Island support, Siri and Shortcuts integration, Workout history and calorie tracking, Apple Watch app, Shareable timers

**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

[App page](https://appshunter.io/ios/app/interval-timer-tempo-fit/id6779231388)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $2.99 | per month |
| Premium Yearly | $19.99 | per year |


## 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 free?

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

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

Both Interval Timer for HIIT | Cero and Interval Timer show ads.

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

Interval Timer for HIIT | Cero ships an update every 3 days, and Interval Timer every 2 months. Most recently, Interval Timer for HIIT | Cero was updated on November 11, 2026 and Interval Timer on November 10, 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.*