# The Engine Room Gym vs Interval Timer HIIT Timer ++

The clearest difference is in-app purchases: The Engine Room Gym at none against Interval Timer HIIT Timer ++'s 1. The Engine Room Gym also leads on iOS requirement (14.0 vs 17.0). Interval Timer HIIT Timer ++'s advantage is update cadence (fortnightly vs every 8 months) and device support. On price there is nothing between them.

Both are free to download. Interval Timer HIIT Timer ++ sells 1 in-app purchase, starting at $1.99 per 7 days. The Engine Room Gym asks for nothing beyond the download.

The Engine Room Gym ships an update every 8 months, Interval Timer HIIT Timer ++ fortnightly. The most recent releases landed on October 12, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | The Engine Room Gym | Interval Timer HIIT Timer ++ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | Yes |
| Update frequency | Every 8 months | **Fortnightly** |
| Size | 56 MB | 7 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | — | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [TeamUp Sports](https://appshunter.io/developer/1449504626) | [Appwallet Technologies Private Limited](https://appshunter.io/developer/1581780855) |

## What reviewers say

### The Engine Room Gym

[App page](https://appshunter.io/ios/app/the-engine-room-gym/id6618139146)

**In-app purchases:** none


### Interval Timer HIIT Timer ++

[App page](https://appshunter.io/ios/app/interval-timer-hiit-timer-plus-plus/id6737910658)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HIIT | $1.99 | per 7 days |


## Frequently asked questions

### Is The Engine Room Gym free?

The Engine Room Gym 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.

### Which is updated more often, The Engine Room Gym or Interval Timer HIIT Timer ++?

The Engine Room Gym ships an update every 8 months, and Interval Timer HIIT Timer ++ fortnightly. Most recently, The Engine Room Gym was updated on October 12, 2026 and Interval Timer HIIT Timer ++ on October 9, 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.*