Marinus vs Seabook+
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Marinus
This app provides comprehensive guidance on maritime navigation rules and signals. It offers detailed information on flags, lights, sounds, and buoyage systems, along with interactive quizzes and a map feature. Designed for sailors, it ensures safe navigation on any vessel.
- Maritime flags and meanings
- Weather scales and cloud identification
- Sound signal guidance
- Vessel navigation light diagrams
- Day shape identification
- Safe navigation maneuvers
- Morse code decoder
- IALA Buoyage System
- Radio communication guidelines
- COLREGs text
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Not just another app for navigation rules… this is THE app for navigation rules! Created by sailors, for sailors, Marinus COLREGs is designed to provide clear and instant answers to your questions anytime, anywhere. It's the essential app for your sailboat or motorboat. Key Features: • Flags – All maritime flags with their meanings. • Meteo – Beaufort and Douglas scales, plus cloud identification. • Sounds – Navigate safely with sound signal guidance. • Lights – Detailed views of every vessel's navigation lights from all angles. • Day Shapes – Learn and identify the correct day shapes for any situation. • Maneuvers – Clear guidance on safe navigation maneuvers. • Morse – Decode Morse signals with ease. • Buoys (IALA) – Understand the International Buoyage System. • Radio – Key radio communication guidelines. • ColRegs – Full text of the International Regulations for Preventing Collisions at Sea (IRPCS). • Quiz – Test your knowledge with interactive quizzes. • Map – Visualize navigation concepts on an interactive map. Access PRO Features Unlock all PRO features with an affordable annual subscription. Your support helps us maintain and improve the app, keeping it the trusted tool for sailors around the world. Join thousands of sailors who trust Marinus ColRegs every day on their iPhone. Whether you're an experienced seafarer or just starting your nautical journey, this is the app you’ve been looking for! For any questions, feel free to contact us at info@marinus.es.
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.
Screenshots
Verdict
The clearest difference is price: Marinus at Free against Seabook+'s $6.99. Marinus also leads on update cadence (every 5 weeks vs every 35 months) and ratings volume (215 vs 2). Seabook+'s advantage is rating (5.0 vs 4.4) and in-app purchases (none vs 1). On review sentiment, device support and iOS requirement 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
Marinus is free to download; Seabook+ costs $6.99 up front. Marinus sells 1 in-app purchase, starting at $8.99 per year. Seabook+ asks for nothing beyond the download.
Seabook+ holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Marinus has 215 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 65% of Marinus's written reviews are positive against 62% of Seabook+'s, so the app with the better star average is not the one people write more warmly about.
Marinus ships an update every 5 weeks, Seabook+ every 35 months. The most recent releases landed on September 26, 2026 and September 24, 2026 respectively.
| Parameter | Marinus | Seabook+ |
|---|---|---|
| Price | Free — better | $6.99 |
| Rating | 4.4 (215 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 65.3% of reviews — better | 61.5% of reviews |
| Number of ratings | 215 — better | 2 |
| Update frequency | Every 5 weeks — better | Every 35 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 113 MB | 37 MB |
| Age rating | 4+ | 12+ |
| Developer | Alejandro | Ozgur GUNES |
Customer experience
Marinus
Seabook+
Bugs and requests
Marinus
Reported bugs
4 issues- App not working, ads won't clear
- App crashes frequently
- Mistake with sounds
- App crashes after 10-15 seconds
Requested features
7 requests- Settings for Buoyage A & B & combined
- Search feature
- Combine sounds and lights
- Add tides information
- More free version functionality
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- More detail in maneuvers section
- Lights with silhouette and head-on/stern-on views
Seabook+
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Marinus
- Marinus PRO3 Days trial$8.991 Year
Seabook+
No in-app purchases







