Master vs SailPrep
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
SailPrep
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Whether you're taking your first sailing course, preparing for a certification, or simply want to refresh your knowledge before heading out on the water, SailPrep helps you become a safer and more confident skipper. Designed for both beginners and experienced sailors, SailPrep combines structured learning with quick revision and spaced repetition so important knowledge stays fresh—even after you've passed your exam. Prepare for sailing exams Study for popular sailing qualifications including: Lithuanian LBS boating and sailing exams RYA theory courses Day Skipper Coastal Skipper ICC preparation SRC radio basics ...and many other recreational boating courses. Learn faster Master essential topics including: COLREGs (Collision Regulations) CEVNI inland waterway rules Navigation Buoys and marks Lights and shapes Sound signals Safety equipment Weather Knots and lines Seamanship First aid Anchoring Mooring And much more. Stay sharp with smart notifications Learning shouldn't stop after the exam. Receive short, useful notifications containing: exam facts common mistakes quick revision questions safety reminders practical sailing tips Perfect for keeping your knowledge fresh throughout the sailing season. Study anywhere Flashcards Quiz mode Progress tracking Learn at your own pace Quick revision before sailing trips Bite-sized lessons that fit into your day Whether you're preparing for your first lesson, your next exam, or your next sailing adventure, SailPrep helps you become a better, safer sailor. Learn. Remember. Sail confidently. Terms of Use: https://monikazibolyte.github.io/SailPrep/terms.html Privacy Policy: https://monikazibolyte.github.io/SailPrep/privacy-policy.html Subscription Terms: https://monikazibolyte.github.io/SailPrep/subscription-terms.html
Screenshots
Verdict
The clearest difference is device support: SailPrep at 3 against Master's 1. SailPrep also leads on iOS requirement (15.1 vs 17.6). On price, update cadence, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Master ships an update fortnightly, SailPrep every 2 weeks. The most recent releases landed on October 8, 2026 and October 5, 2026 respectively.
| Parameter | Master | SailPrep |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| Update frequency | Fortnightly — better | Every 2 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 305 MB | 66 MB |
| Age rating | 4+ | 4+ |
| Developer | Peterjohn Chisholm | Monika Zibolyte |
In-app purchases
Master
No in-app purchases
SailPrep
No in-app purchases
