Comparison

The OOW Bible vs SailPrep

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

The OOW Bible

Features
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**The Bible for all present & future OOWs.** **The complete reference for every Officer of the Watch β€” from exam prep to bridge watch.** The OOW Bible covers every topic on the MCA Officer of the Watch (Unlimited) syllabus in a single app. Whether you're sitting Part A and Part B for the first time, or you're a qualified OOW refreshing your knowledge before stepping back on the bridge, this is the reference you'll reach for. **START WITH A 7-DAY FREE TRIAL** Try every Premium feature free for 7 days β€” no charge until day 8. Cancel any time during the trial and you won't pay a thing. **PART A EXAM SIMULATOR** Replicate the real My Know exam experience with all five question types: β€’ Multiple choice β€’ True/False β€’ Matching β€’ Fill in the blank β€’ Drag and drop 15 questions. 40 minutes. No returning to previous questions β€” just like the real thing. Per-topic pass threshold tracking (COLREGs & Buoyage 90%, Nav Procedures 80%, Overall 70%) so you always know where you stand. **AI ORAL EXAM SIMULATOR** Practice your Part B oral with an AI examiner powered by Claude (Anthropic). Two modes: β€’ **Session Mode** β€” A full multi-turn oral examination on a scenario. The AI asks follow-up questions, challenges your answers, and rates each exchange. β€’ **Quick Assessment** β€” Submit a free-text answer and get a structured grading report: verdict (PASS / BORDERLINE / FAIL), score, key points checklist, missed topics, and examiner commentary. **SPACED REPETITION FLASHCARDS** Over 1,400 flashcards across all 10 modules, powered by the SM-2 spaced repetition algorithm. The app learns what you know and what you don't β€” surfacing the right cards at exactly the right time to build lasting knowledge, not just short-term memory. **10 COMPLETE MODULES** Navigation Β· COLREGs & Buoyage Β· Radar & ARPA Β· Meteorology Β· Watchkeeping & BRM Β· Ship Stability Β· Cargo Operations Β· Safety & Legislation Β· Emergency Response Β· Ship Handling All mapped to MIN 653 (Amendment 1, November 2024). **QUICK REFERENCE LIBRARY** 10 instant-access reference topics β€” not buried in lesson content, just the rules and data you need: IALA buoyage Β· COLREGs lights & shapes Β· Sound signals Β· VHF channels Β· Beaufort scale Β· Douglas sea scale Β· Distress signals Β· IAMSAR SAR patterns Β· Day shapes Β· Light characteristics Useful for exam candidates drilling topics. Just as useful for the OOW heading back to sea after a rotation ashore who needs a fast, reliable refresher before stepping onto the bridge. **GAMIFICATION** XP, levels, streaks, and daily challenges keep you consistent through months of exam prep. **WORKS OFFLINE** Everything β€” flashcards, lessons, quick reference, exam simulator β€” works completely offline. Whether you're studying at sea or on a long-haul flight. --- *The OOW Bible is an educational study tool and is not affiliated with, endorsed by, or produced by the Maritime and Coastguard Agency (MCA). Always verify content against current official publications.* Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

SailPrep

Features
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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 freshβ€”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

The OOW Bible4 screens
SailPrep4 screens

Verdict

The call

The clearest difference is in-app purchases: SailPrep at none against The OOW Bible's 5. The OOW Bible's advantage is update cadence (every 6 days vs every 2 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. The OOW Bible sells 5 in-app purchases, starting at $2.99 per month. SailPrep asks for nothing beyond the download.

UpkeepUpdate frequency

The OOW Bible ships an update every 6 days, SailPrep every 2 weeks. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

Scorecard2 real differences Β· 4 level
The OOW Bible versus SailPrep: the parameters behind the verdict, then further details
ParameterThe OOW BibleSailPrep
PriceFreeFree
Update frequencyEvery 6 days β€” betterEvery 2 weeks
AdsNoNo
In-app purchasesYesNo β€” better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.115.1
Further details β€” not scored
Size100 MB66 MB
Age rating4+4+
DeveloperAzimuth Systems LtdMonika Zibolyte

In-app purchases

5 purchases

The OOW Bible

Subscriptions3
  • Premium Monthly$2.991 Month
  • Premium Monthly7 Days trial$4.991 Month
  • Premium Annual7 Days trial$39.991 Year
One-time2
  • 2 Oral Exam Sessions$0.99
  • 10 Oral Exam Sessions$3.99
None

SailPrep

No in-app purchases

Questions

Is The OOW Bible free?
The OOW Bible is free to download, with in-app purchases available.
Is SailPrep free?
SailPrep is free to download, with no in-app purchases.
Do The OOW Bible or SailPrep have ads?
Neither The OOW Bible nor SailPrep shows ads.
Which is updated more often, The OOW Bible or SailPrep?
The OOW Bible ships an update every 6 days, and SailPrep every 2 weeks. Most recently, The OOW Bible was updated on October 24, 2026 and SailPrep on October 31, 2026.

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