# IntervalTimer Duo vs Round

The clearest difference is in-app purchases: Round at none against IntervalTimer Duo's 1. Round also leads on update cadence (weekly vs every 2 weeks) and iOS requirement (17.2 vs 26.1). On price, ads and device support there is nothing between them.

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

IntervalTimer Duo ships an update every 2 weeks, Round weekly. The most recent releases landed on September 7, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | IntervalTimer Duo | Round |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/round-hiit-workout-timer/id6757195833/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Weekly** |
| Monetization | — | Free |
| Size | 10 MB | 34 MB |
| Requires iOS | 26.1 | **17.2** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [kosuke konuma](https://appshunter.io/developer/1767116232) | [Ryosuke Nakayama](https://appshunter.io/developer/1865209768) |

## What reviewers say

### IntervalTimer Duo

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

**Features:** Vision Pro support

**In-app purchases (1)**

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


### Round

[App page](https://appshunter.io/ios/app/round-hiit-workout-timer/id6757195833)

This interval timer is designed for high-intensity interval training (HIIT), Tabata, and circuit workouts. It allows users to create custom routines with multiple exercises and track their progress. The app offers haptic alerts and can be controlled from an Apple Watch.

**Highlights:** Customizable interval routines, HIIT, Tabata, and circuit training support, Apple Watch control, Haptic alerts for round changes, Visual arc timer, Workout progress tracking, Apple Health integration

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is IntervalTimer Duo free?

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

### Is Round free?

Round is free to download, with no in-app purchases.

### Do IntervalTimer Duo or Round have ads?

Neither IntervalTimer Duo nor Round shows ads.

### Which is updated more often, IntervalTimer Duo or Round?

IntervalTimer Duo ships an update every 2 weeks, and Round weekly. Most recently, IntervalTimer Duo was updated on September 7, 2026 and Round on September 24, 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.*