# IntervalTimer Duo vs HIIT Timer & Trainer

The clearest difference is update cadence: HIIT Timer & Trainer at every 2 days against IntervalTimer Duo's every 3 weeks. HIIT Timer & Trainer also leads on iOS requirement (17.0 vs 26.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. IntervalTimer Duo sells 1 one-off in-app purchase and HIIT Timer & Trainer sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

IntervalTimer Duo ships an update every 3 weeks, HIIT Timer & Trainer every 2 days. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | IntervalTimer Duo | HIIT Timer & Trainer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Size | 10 MB | 3 MB |
| Requires iOS | 26.1 | **17.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [kosuke konuma](https://appshunter.io/developer/1767116232) | [Anton Popov](https://appshunter.io/developer/6773402224) |

## What reviewers say

### 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 |


### HIIT Timer & Trainer

[App page](https://appshunter.io/ios/app/hiit-timer-and-trainer/id6773600697)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock presets | $0.99 | one-time |
| Your Training Plans | $2.99 | one-time |


## Frequently asked questions

### Is IntervalTimer Duo free?

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

### Is HIIT Timer & Trainer free?

HIIT Timer & Trainer is free to download, with in-app purchases available.

### Do IntervalTimer Duo or HIIT Timer & Trainer have ads?

Neither IntervalTimer Duo nor HIIT Timer & Trainer shows ads.

### Which is updated more often, IntervalTimer Duo or HIIT Timer & Trainer?

IntervalTimer Duo ships an update every 3 weeks, and HIIT Timer & Trainer every 2 days. Most recently, IntervalTimer Duo was updated on October 30, 2026 and HIIT Timer & Trainer on October 28, 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.*