# Seabook Maritime vs Master

The clearest difference is price: Seabook Maritime at Free against Master's $1.99. Seabook Maritime also leads on iOS requirement (13.0 vs 15.0). Master's advantage is update cadence (fortnightly vs every 16 months) and review sentiment (97% vs 79%). On ads, in-app purchases and device support there is nothing between them.

Seabook Maritime is free to download; Master costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Master holds the better App Store score, 4.7 against 4.5. Both are backed by a comparable volume of ratings — 19 and 94 respectively. Written reviews point the same way: 79% of Seabook Maritime's written reviews are positive against 97% of Master's.

Seabook Maritime ships an update every 16 months, Master fortnightly. The most recent releases landed on August 21, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Seabook Maritime | Master |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [4.5 (19 ratings)](https://appshunter.io/ios/app/seabook-maritime/id708215141/reviews) | **[4.7 (94 ratings)](https://appshunter.io/ios/app/master-nav/id1602390396/reviews)** |
| Number of ratings | 19 | **94** |
| Positive reviews | 79.1% of reviews | **96.9% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Fortnightly** |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#117** |
| Size | 36 MB | 117 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ozgur GUNES](https://appshunter.io/developer/708215144) | [Peterjohn Chisholm](https://appshunter.io/developer/1602390398) |

## What reviewers say

### Seabook Maritime

[App page](https://appshunter.io/ios/app/seabook-maritime/id708215141)

This app provides essential maritime information for seafarers and shore-based professionals. It serves as an offline reference for ship stability, navigation, regulations, and marine engineering, aiding in safer seas and cleaner waters.

**Highlights:** COLREG regulations, GMDSS information, Marine engineering details, Navigation at sea, Ship stability calculations, Shipboard safety guidelines

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

**In-app purchases:** none


### Master

[App page](https://appshunter.io/ios/app/master-nav/id1602390396)

**Currently charting:** #117 Top Paid · Education (US App Store)

Learn maritime navigation rules with an interactive system designed for effective retention. This app breaks down complex regulations into manageable sections with visual aids and mnemonics. It revisits incorrect answers and provides instant graphical feedback, making the learning process intuitive and efficient.

**Highlights:** Interactive learning system, Step-by-step rule guidance, Mnemonics and memory aids, Interactive visuals, Graphical feedback on answers, Practice section with progress tracking

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

**In-app purchases:** none


## Frequently asked questions

### Is Seabook Maritime free?

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

### Is Master free?

Master costs $1.99, with no in-app purchases.

### Which has better reviews, Seabook Maritime or Master?

Master is rated higher. Seabook Maritime averages 4.5 out of 5 from 19 ratings, while Master averages 4.7 from 94 ratings.

### Do Seabook Maritime or Master have ads?

Neither Seabook Maritime nor Master shows ads.

### Which is updated more often, Seabook Maritime or Master?

Seabook Maritime ships an update every 16 months, and Master fortnightly. Most recently, Seabook Maritime was updated on August 21, 2026 and Master on September 22, 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.*