# Master vs IRPCS

The clearest difference is in-app purchases: Master at none against IRPCS's 2. Master also leads on ads (none vs shown). IRPCS's advantage is update cadence (every 3 days vs fortnightly) and iOS requirement (15.1 vs 17.6). On price and device support there is nothing between them.

Both are free to download. IRPCS sells 2 in-app purchases, starting at $4.99 per month. Master asks for nothing beyond the download.

Master ships an update fortnightly, IRPCS every 3 days. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Master | IRPCS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/master-nav-colregs-iala-tests/id6758554000/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | **Every 3 days** |
| Monetization | Free | — |
| Size | 305 MB | 73 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Peterjohn Chisholm](https://appshunter.io/developer/1602390398) | [Paul Whittle](https://appshunter.io/developer/1076749256) |

## What reviewers say

### Master

[App page](https://appshunter.io/ios/app/master-nav-colregs-iala-tests/id6758554000)

Practice maritime navigation rules and buoyage systems with this app. It helps you identify knowledge gaps and track your progress in mastering essential regulations for mariners.

**Highlights:** USCG Navigation Rules practice, IALA Maritime Buoyage System tests, Knowledge gap identification, Progress tracking, Developed by Master Mariner

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

**In-app purchases:** none


### IRPCS

[App page](https://appshunter.io/ios/app/irpcs/id6762519800)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| IRPCS Pro 1 month | $4.99 | per month |
| IRPCS Pro | $29.99 | per year |


## Frequently asked questions

### Is Master free?

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

### Is IRPCS free?

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

### Do Master or IRPCS have ads?

IRPCS shows ads; Master does not.

### Which is updated more often, Master or IRPCS?

Master ships an update fortnightly, and IRPCS every 3 days. Most recently, Master was updated on October 31, 2026 and IRPCS on November 5, 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.*