# engine vs Sou9

The clearest difference is update cadence: Sou9 at every 2 weeks against engine's every 13 months. 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.

engine ships an update every 13 months, Sou9 every 2 weeks. The most recent releases landed on September 24, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | engine | Sou9 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/engine-teardown/id1004536137/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 6 MB | 99 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Lufthansa Technik AG - Innovation](https://appshunter.io/developer/419109455) | [Basel Aridi](https://appshunter.io/developer/1778190911) |

## What reviewers say

### engine

[App page](https://appshunter.io/ios/app/engine-teardown/id1004536137)

This app tracks the disassembly of aircraft engines, detailing each event, associated documents, and parts involved. It provides a comprehensive overview of the engine teardown process.

**Highlights:** Monitor aircraft engine teardown, View all teardown events, Access associated documents, Track engine parts

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

**In-app purchases:** none


### Sou9

[App page](https://appshunter.io/ios/app/sou9/id6737824305)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is engine free?

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

### Is Sou9 free?

Sou9 is free to download, with no in-app purchases.

### Do engine or Sou9 have ads?

Neither engine nor Sou9 shows ads.

### Which is updated more often, engine or Sou9?

engine ships an update every 13 months, and Sou9 every 2 weeks. Most recently, engine was updated on September 24, 2026 and Sou9 on September 19, 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.*