# Seabook+ vs Master

The clearest difference is review sentiment: Master at 97% against Seabook+'s 62%. Master also leads on update cadence (fortnightly vs every 35 months) and price ($1.99 vs $6.99). Seabook+'s advantage is rating (5.0 vs 4.7) and iOS requirement (13.0 vs 15.0). On ads, in-app purchases, monetization model and device support there is nothing between them.

Seabook+ costs $6.99 and Master $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Seabook+ holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Master has 94 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 62% of Seabook+'s written reviews are positive against 97% of Master's, so the app with the better star average is not the one people write more warmly about.

Seabook+ ships an update every 35 months, Master fortnightly. The most recent releases landed on September 24, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Seabook+ | Master |
| --- | --- | --- |
| Price | $6.99 | **$1.99** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/seabook-plus/id1517249755/reviews)** | [4.7 (94 ratings)](https://appshunter.io/ios/app/master-nav/id1602390396/reviews) |
| Number of ratings | 2 | **94** |
| Positive reviews | 61.5% of reviews | **96.9% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 35 months | **Fortnightly** |
| Monetization | Paid | Paid |
| Size | 37 MB | 117 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| 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/id1602390396)

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+ free?

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

### Is Master free?

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

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

Seabook+ is rated higher. Seabook+ averages 5.0 out of 5 from 2 ratings, while Master averages 4.7 from 94 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 September 24, 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.*