Seabook+ vs Master
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Seabook+
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.
- Comprehensive maritime information
- Navigational and technical computations
- Offline accessibility
- User-friendly interface
- Information for marine professionals
- Knowledge for sea enthusiasts
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Seabook is an information and knowledge source for marine professionals, sailors as well as sea enthusiasts. Seabook Master contains comprehensive and detailed information on the profession. Seabook fits to use at sea with offline accessibility and best user interface. The tools help navigational and technical computations and conversations at ease.
Master
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.
- USCG Navigation Rules practice
- IALA Maritime Buoyage System tests
- Knowledge gap identification
- Progress tracking
- Developed by Master Mariner
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Master-Nav: COLREGS IALA Tests is a free practice app developed by a Master Mariner with 30 years of seagoing experience. Test your knowledge of the USCG Navigation Rules and IALA Maritime Buoyage System — the regulations every mariner needs to know. A straightforward way to find out where you stand, identify gaps in your knowledge and track your progress over time. Master COLREGS & IALA — the easy way.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Seabook+ | Master |
|---|---|---|
| Price | $6.99 | Free — better |
| Rating | 4.0 (3 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 53.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 3 — better | 1 |
| Update frequency | Every 35 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 13.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 37 MB | 305 MB |
| Age rating | 12+ | 4+ |
| Developer | Ozgur GUNES | Peterjohn Chisholm |
Customer experience
Seabook+
Master
In-app purchases
Seabook+
No in-app purchases
Master
No in-app purchases
