# AeroEngineS vs EASA Part 66 Exam Trainer

The clearest difference is in-app purchases: AeroEngineS at none against EASA Part 66 Exam Trainer's 10. AeroEngineS also leads on update cadence (every 3 days vs every 7 months). EASA Part 66 Exam Trainer's advantage is ratings volume (6 vs 1). On price, rating, ads and monetization model there is nothing between them.

Both are free to download. EASA Part 66 Exam Trainer sells 10 one-off in-app purchases. AeroEngineS asks for nothing beyond the download.

AeroEngineS holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: EASA Part 66 Exam Trainer has 6 ratings behind it against 1, so its average is the more settled of the two.

AeroEngineS ships an update every 3 days, EASA Part 66 Exam Trainer every 7 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | AeroEngineS | EASA Part 66 Exam Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/aeroengines/id1451710013/reviews)** | [4.8 (6 ratings)](https://appshunter.io/ios/app/easa-part-66-exam-trainer/id1477203089/reviews) |
| Number of ratings | 1 | **6** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 7 months |
| Monetization | Free | Free |
| Size | 7 MB | 79 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aristotle University of Thessaloniki](https://appshunter.io/developer/542325073) | [David Alexander Hansen](https://appshunter.io/developer/1216586088) |

## What reviewers say

### AeroEngineS

[App page](https://appshunter.io/ios/app/aeroengines/id1451710013)

This app simulates the thermodynamic cycles and performance of various aircraft and rocket engines. It calculates key parameters like thrust, mass flow, and emissions, and can predict compressor map operating points.

**Highlights:** Turbojet and turbofan engine simulation, Rocket engine cycle analysis, Ramjet engine simulation, Emissions calculation, Compressor map prediction, Thermodynamic cycle analysis

**Features:** macOS Compatibility

**In-app purchases:** none


### EASA Part 66 Exam Trainer

[App page](https://appshunter.io/ios/app/easa-part-66-exam-trainer/id1477203089)

Prepare for EU Part 66 aircraft maintenance engineer exams with over 750 multiple-choice questions across various modules. This app serves as a supplementary training tool for classroom learning, allowing you to practice on the go.

**Highlights:** Over 750 multiple-choice questions, Covers multiple EU Part 66 modules, B1.1 / A1 exam preparation, Supplementary training tool, Practice on the go, Developed by skilled engineers

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Module 5 for the Part 66 exam | $0.99 | one-time |
| Module 6 for the Part 66 exam | $0.99 | one-time |
| Module 7 for the Part 66 exam | $0.99 | one-time |
| Module 8 for the Part 66 exam | $0.99 | one-time |
| Module 10 for the Part 66 exam | $0.99 | one-time |
| Module 15 for the Part 66 exam | $0.99 | one-time |
| Module 9 for the Part 66 exam | $0.99 | one-time |
| Module 11A for the Part 66 exam | $0.99 | one-time |
| Module 4 for the Part 66 exam | $0.99 | one-time |
| Unlock all modules forever | $2.99 | one-time |


## Frequently asked questions

### Is AeroEngineS free?

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

### Is EASA Part 66 Exam Trainer free?

EASA Part 66 Exam Trainer is free to download, with in-app purchases available.

### Which has better reviews, AeroEngineS or EASA Part 66 Exam Trainer?

AeroEngineS is rated higher. AeroEngineS averages 5.0 out of 5 from 1 ratings, while EASA Part 66 Exam Trainer averages 4.8 from 6 ratings.

### Do AeroEngineS or EASA Part 66 Exam Trainer have ads?

Neither AeroEngineS nor EASA Part 66 Exam Trainer shows ads.

### Which is updated more often, AeroEngineS or EASA Part 66 Exam Trainer?

AeroEngineS ships an update every 3 days, and EASA Part 66 Exam Trainer every 7 months. Most recently, AeroEngineS was updated on November 2, 2026 and EASA Part 66 Exam Trainer on November 3, 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.*