# Our engines vs Hapster Train

The clearest difference is update cadence: Hapster Train at every 2 months against Our engines's every 7 months. Hapster Train also leads on iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Our engines ships an update every 7 months, Hapster Train every 2 months. The most recent releases landed on October 22, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Our engines | Hapster Train |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/our-engines/id638750487/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 2.7 GB | 129 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Safran](https://appshunter.io/developer/638750590) | [Hapster](https://appshunter.io/developer/1714243927) |

## What reviewers say

### Our engines

[App page](https://appshunter.io/ios/app/our-engines/id638750487)

Explore the inner workings of civil and military aircraft engines through interactive 3D animations. Discover the aircraft they power and test your knowledge to become an aeronautical expert.

**Highlights:** Immersive 3D animations, Detailed engine operation exploration, Aircraft powered by engines, Knowledge testing quizzes, Iconic engine examples, Aeronautical engineering insights

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

**In-app purchases:** none


### Hapster Train

[App page](https://appshunter.io/ios/app/hapster-train/id6471591604)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Our engines free?

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

### Is Hapster Train free?

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

### Do Our engines or Hapster Train have ads?

Neither Our engines nor Hapster Train shows ads.

### Which is updated more often, Our engines or Hapster Train?

Our engines ships an update every 7 months, and Hapster Train every 2 months. Most recently, Our engines was updated on October 22, 2026 and Hapster Train on October 11, 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.*