# GMDSS TRAINER vs CA'Sim

The clearest difference is update cadence: CA'Sim at weekly against GMDSS TRAINER's every 4 weeks. CA'Sim also leads on iOS requirement (18.6 vs 26.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. GMDSS TRAINER sells 1 one-off in-app purchase and CA'Sim sells 4 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

GMDSS TRAINER ships an update every 4 weeks, CA'Sim weekly. The most recent releases landed on October 23, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | GMDSS TRAINER | CA'Sim |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/gmdss-trainer/id6757383433/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Weekly** |
| Monetization | Free | — |
| Size | 27 MB | 6 MB |
| Requires iOS | 26.1 | **18.6** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Osprey Applications LLC](https://appshunter.io/developer/1619576372) | [Jatuphol Jaturapat](https://appshunter.io/developer/1788860463) |

## What reviewers say

### GMDSS TRAINER

[App page](https://appshunter.io/ios/app/gmdss-trainer/id6757383433)

Prepare for FCC maritime radio operator exams with this comprehensive study companion. It features official question pools, AI-powered explanations for complex topics, and flexible study modes to help you understand material and pass your certification tests.

**Highlights:** Official FCC question pools, AI-powered explanations, Multiple study modes (Practice, Exam, Review), Detailed analytics and progress tracking, Smart flagging for difficult questions, Topic-based performance breakdowns

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $14.99 | one-time |


### CA'Sim

[App page](https://appshunter.io/ios/app/casim/id6758004211)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Features. (1 Month) | $0.99 | per month |
| Unlock All Features. (3 Months) | $2.99 | per 3 months |
| Unlock All Features. (1 Year) | $7.99 | per year |
| Lifetime Access | $17.99 | one-time |


## Frequently asked questions

### Is GMDSS TRAINER free?

GMDSS TRAINER is free to download, with in-app purchases available.

### Is CA'Sim free?

CA'Sim is free to download, with in-app purchases available.

### Do GMDSS TRAINER or CA'Sim have ads?

Neither GMDSS TRAINER nor CA'Sim shows ads.

### Which is updated more often, GMDSS TRAINER or CA'Sim?

GMDSS TRAINER ships an update every 4 weeks, and CA'Sim weekly. Most recently, GMDSS TRAINER was updated on October 23, 2026 and CA'Sim 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.*