# IntervalTimer(x) vs IntervalTimer Duo

The clearest difference is in-app purchases: IntervalTimer(x) at none against IntervalTimer Duo's 1. IntervalTimer(x) also leads on iOS requirement (18.1 vs 26.1). IntervalTimer Duo's advantage is device support (3 vs 1). On price, update cadence and ads there is nothing between them.

Both are free to download. IntervalTimer Duo sells 1 one-off in-app purchase. IntervalTimer(x) asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 weeks. Both last shipped on October 30, 2026.

## The numbers

| Metric | IntervalTimer(x) | IntervalTimer Duo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/intervaltimerx/id6745199760/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free | — |
| Size | 9 MB | 10 MB |
| Requires iOS | **18.1** | 26.1 |
| Devices | iPhone | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [ShapeHaven Innovations LLC](https://appshunter.io/developer/1747127977) | [kosuke konuma](https://appshunter.io/developer/1767116232) |

## What reviewers say

### IntervalTimer(x)

[App page](https://appshunter.io/ios/app/intervaltimerx/id6745199760)

This app provides a customizable interval timer for workouts, focus sessions, and breaks. It offers audio cues, visual progress, and tracks workout history locally. Optional body metrics can be entered for calorie estimates, all stored securely on your device.

**Highlights:** Customizable work/rest/sets intervals, Audio cues for transitions, Workout history log, Local calorie estimates, Offline functionality, Siri Shortcuts integration

**Features:** macOS Compatibility

**In-app purchases:** none


### IntervalTimer Duo

[App page](https://appshunter.io/ios/app/intervaltimer-duo/id6753626424)

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $2.99 | one-time |


## Frequently asked questions

### Is IntervalTimer(x) free?

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

### Is IntervalTimer Duo free?

IntervalTimer Duo is free to download, with in-app purchases available.

### Do IntervalTimer(x) or IntervalTimer Duo have ads?

Neither IntervalTimer(x) nor IntervalTimer Duo shows ads.

### Which is updated more often, IntervalTimer(x) or IntervalTimer Duo?

IntervalTimer(x) ships an update every 3 weeks, and IntervalTimer Duo every 3 weeks. Most recently, IntervalTimer(x) was updated on October 30, 2026 and IntervalTimer Duo on October 30, 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.*