# CAT SIS vs EASA Part 66 Modules Exam

The clearest difference is rating: EASA Part 66 Modules Exam at 5.0 against CAT SIS's 3.7. CAT SIS's advantage is in-app purchases (none vs 11) and update cadence (daily vs every 6 weeks). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. EASA Part 66 Modules Exam sells 11 one-off in-app purchases. CAT SIS asks for nothing beyond the download.

EASA Part 66 Modules Exam holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 3 and 2 respectively.

CAT SIS ships an update daily, EASA Part 66 Modules Exam every 6 weeks. The most recent releases landed on September 21, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | CAT SIS | EASA Part 66 Modules Exam |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/cat-sis/id6479576357/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/easa-part-66-modules-exam/id6736773464/reviews)** |
| Number of ratings | **3** | 2 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Every 6 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 20 MB | 23 MB |
| Requires iOS | **13.0** | 13.4 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Informatique for Information Technology](https://appshunter.io/developer/1505295476) | [Sergei Vildanov](https://appshunter.io/developer/1773329159) |

## What reviewers say

### CAT SIS

[App page](https://appshunter.io/ios/app/cat-sis/id6479576357)

This app provides a comprehensive platform for students and faculty to manage academic information. It offers features for tracking grades, attendance, schedules, and financial details, aiming to enhance educational efficiency and collaboration.

**Highlights:** Academic profile management, Grade and GPA tracking, Attendance monitoring, Timetable and class details, Test and college cost information, Faculty class management

**Features:** macOS Compatibility

**In-app purchases:** none


### EASA Part 66 Modules Exam

[App page](https://appshunter.io/ios/app/easa-part-66-modules-exam/id6736773464)

Prepare for aviation certification exams with this app. It offers practice tests covering 17 modules, with multiple-choice questions and a time limit. Users can access free modules or purchase additional content for comprehensive study.

**Highlights:** 17 exam modules, Multiple-choice questions, Timed tests, 75% passing score, Free and paid modules, Full access purchase option

**Features:** macOS Compatibility

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Module 3 | $2.99 | one-time |
| Module 15 | $2.99 | one-time |
| Module 14 | $2.99 | one-time |
| Module 17 | $2.99 | one-time |
| Module 5 | $2.99 | one-time |
| Module 6 | $2.99 | one-time |
| Module 7 | $2.99 | one-time |
| Module 8 | $2.99 | one-time |
| Module 12 | $2.99 | one-time |
| Module 16 | $2.99 | one-time |
| 14 Days Full Access | $14.99 | one-time |


## Frequently asked questions

### Is CAT SIS free?

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

### Is EASA Part 66 Modules Exam free?

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

### Which has better reviews, CAT SIS or EASA Part 66 Modules Exam?

EASA Part 66 Modules Exam is rated higher. CAT SIS averages 3.7 out of 5 from 3 ratings, while EASA Part 66 Modules Exam averages 5.0 from 2 ratings.

### Do CAT SIS or EASA Part 66 Modules Exam have ads?

Neither CAT SIS nor EASA Part 66 Modules Exam shows ads.

### Which is updated more often, CAT SIS or EASA Part 66 Modules Exam?

CAT SIS ships an update daily, and EASA Part 66 Modules Exam every 6 weeks. Most recently, CAT SIS was updated on September 21, 2026 and EASA Part 66 Modules Exam on September 30, 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.*