# RadarPlot vs Master

The clearest difference is in-app purchases: Master at none against RadarPlot's 1. Master also leads on update cadence (fortnightly vs every 4 months). RadarPlot's advantage is iOS requirement (15.1 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. RadarPlot sells 1 one-off in-app purchase. Master asks for nothing beyond the download.

RadarPlot ships an update every 4 months, Master fortnightly. Both last shipped on October 31, 2026.

## The numbers

| Metric | RadarPlot | Master |
| --- | --- | --- |
| 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 | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | — | Free |
| Size | 58 MB | 305 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Paulina Praciak](https://appshunter.io/developer/1869727950) | [Peterjohn Chisholm](https://appshunter.io/developer/1602390398) |

## What reviewers say

### RadarPlot

[App page](https://appshunter.io/ios/app/radarplot-radar-plot-trainer/id6757932413)

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

**In-app purchases (1)**

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


### 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


## Frequently asked questions

### Is RadarPlot free?

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

### Is Master free?

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

### Do RadarPlot or Master have ads?

Neither RadarPlot nor Master shows ads.

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

RadarPlot ships an update every 4 months, and Master fortnightly. Most recently, RadarPlot was updated on October 31, 2026 and Master on October 31, 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.*