# Interval(x) vs Interval Timer・HIIT Timer

The clearest difference is in-app purchases: Interval(x) at none against Interval Timer・HIIT Timer's 2. Interval Timer・HIIT Timer's advantage is update cadence (every 4 days vs every 10 days) and iOS requirement (15.0 vs 18.1). On price, ads and device support there is nothing between them.

Both are free to download. Interval Timer・HIIT Timer sells 2 in-app purchases, starting at $2.99 per month. Interval(x) asks for nothing beyond the download.

Interval(x) ships an update every 10 days, Interval Timer・HIIT Timer every 4 days. The most recent releases landed on September 18, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Interval(x) | Interval Timer・HIIT Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/intervalx/id6739734149/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 4 days** |
| Monetization | Free | — |
| Size | 2 MB | 74 MB |
| Requires iOS | 18.1 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ShapeHaven Innovations LLC](https://appshunter.io/developer/1747127977) | [Reva Desai](https://appshunter.io/developer/1780266324) |

## What reviewers say

### Interval(x)

[App page](https://appshunter.io/ios/app/intervalx/id6739734149)

An open-source interval timer designed for precision and privacy. Configure work and rest periods with millisecond accuracy for training or daily routines. It offers a transparent, data-free experience for users who value control and simplicity.

**Highlights:** Open Source Transparency, Zero Data Collection, Millisecond Interval Precision, Customizable Work/Rest Periods, Lightweight and Power-Efficient, Privacy-First Design

**Features:** macOS Compatibility

**In-app purchases:** none


### Interval Timer・HIIT Timer

[App page](https://appshunter.io/ios/app/interval-timerhiit-timer/id6748070178)

**Features:** macOS Compatibility

**In-app purchases (2)**

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


## Frequently asked questions

### Is Interval(x) free?

Interval(x) is free to download, with no in-app purchases.

### Is Interval Timer・HIIT Timer free?

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

### Do Interval(x) or Interval Timer・HIIT Timer have ads?

Neither Interval(x) nor Interval Timer・HIIT Timer shows ads.

### Which is updated more often, Interval(x) or Interval Timer・HIIT Timer?

Interval(x) ships an update every 10 days, and Interval Timer・HIIT Timer every 4 days. Most recently, Interval(x) was updated on September 18, 2026 and Interval Timer・HIIT Timer on September 19, 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.*