# Seabook+ vs Master

The clearest difference is review sentiment: Master at 100% against Seabook+'s 53%. Master also leads on price (Free vs $6.99) and rating (5.0 vs 4.0). Seabook+'s advantage is device support (3 vs 1) and ratings volume (3 vs 1). On ads and in-app purchases there is nothing between them.

Master is free to download; Seabook+ costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Master holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews point the same way: 53% of Seabook+'s written reviews are positive against 100% of Master's.

Seabook+ ships an update every 35 months, Master fortnightly. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Seabook+ | Master |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | [4.0 (3 ratings)](https://appshunter.io/ios/app/seabook-plus/id1517249755/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/master-nav-colregs-iala-tests/id6758554000/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 53.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 35 months | **Fortnightly** |
| Monetization | Paid | **Free** |
| Size | 37 MB | 305 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Ozgur GUNES](https://appshunter.io/developer/708215144) | [Peterjohn Chisholm](https://appshunter.io/developer/1602390398) |

## What reviewers say

### Seabook+

[App page](https://appshunter.io/ios/app/seabook-plus/id1517249755)

This app provides comprehensive maritime information for professionals and enthusiasts. It offers tools for navigational and technical computations, designed for easy use at sea with offline accessibility and a user-friendly interface.

**Highlights:** Comprehensive maritime information, Navigational and technical computations, Offline accessibility, User-friendly interface, Information for marine professionals, Knowledge for sea enthusiasts

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

**In-app purchases:** none


### 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 Seabook+ free?

Seabook+ costs $6.99, with no in-app purchases.

### Is Master free?

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

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

Master is rated higher. Seabook+ averages 4.0 out of 5 from 3 ratings, while Master averages 5.0 from 1 ratings.

### Do Seabook+ or Master have ads?

Neither Seabook+ nor Master shows ads.

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

Seabook+ ships an update every 35 months, and Master fortnightly. Most recently, Seabook+ was updated on November 7, 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.*