Comparison

Neptune vs Binnacle School

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

Head to head
About

Neptune

Prepare for USCG COLREG and OOD exams with a comprehensive study system. Features AI tutoring, interactive 3D visuals for lights and shapes, and a complete question bank with intelligent test modes and progress tracking.

Highlights
  • AI-powered tutor for rule explanations
  • Interactive 3D lights and shapes trainer
  • Official USCG question bank
  • Verbatim memory trainer
  • Intelligent exam simulator modes
  • Advanced progress tracking
  • Offline study capability
Features
Read full description

PASS YOUR USCG COLREG & OOD EXAMS WITH CONFIDENCE Neptune: Navigation Rules is the only modern study system that combines the official USCG Question Bank with an AI Tutor, interactive 3D Visual Training, and verbatim cards. Whether you are an Ensign preparing for OOD Phase 1 or a Captain refreshing for a renewal, Neptune replaces heavy textbooks with a smart, pocket-sized coach. NEW: VERBATIm MEMORY TRAINER Level up recall: hide key phrases and type them back to prove you know the rule, not just the letter. Adaptive drills: auto-submit when blanks are filled, with instant feedback and retries to lock in weak spots. Inline citations: jump straight from a missed phrase to the exact rule text. 3D LIGHTS & SHAPES TRAINER Stop memorizing static flashcards. Interactive 3D Models: Rotate vessels to see lights and shapes from any angle. Quiz Mode: Answer questions based on target angle, vessel ID, cardinal direction, and rules of the road. AI-POWERED REFERENCE Don't just memorize the answer—understand the Why. Ask Neptune: Chat with an AI trained specifically on COLREGS and over 500 maritime court cases. Instant Explanations: Get plain-English breakdowns for every question with citations to the rules and cases. Legal Context: Using the court cases see how rules are adjudicated in the real world. COMPLETE USCG QUESTION BANK & BOOK Official Pool: Full access to Inland and International questions. Smart Citation: Every question is linked directly to the specific Rule it tests. Custom Tags: Add your own notes, highlights and rule references. INTELLIGENT TEST MODES Exam Simulator: Mimic the real test by creating presets with precise filters for question number, specific words to be omitted, and rules. Or enable the Smart algorithm to dish you out trouble questions. Study Mode: Filter by "Least Confident" to drill the questions you get wrong. Daily Challenges: Keep your streak alive with quick, timed quizzes to build a daily study habit. ADVANCED PROGRESS TRACKING Confidence Scores: Visualize your mastery of every Rule based on SM-2 Algorithm. Heat Maps: Instantly see if you are weak on "Steering & Sailing" or "Sound Signals." Detailed History: Review past attempts to track your improvement over time. THE MODERN STANDARD Offline Ready: Study in the SCIF or underway—no internet required. Dark Mode: Fully optimized for night watch study sessions. Cloud Sync: Start on your iPhone, finish on your iPad.

About

Binnacle School

Prepare for your U.S. Coast Guard captain's license exams with a structured, module-based study approach. Practice questions with detailed explanations and interactive drills to master navigation, seamanship, and more. Track student progress for classes or unlock all content with a premium subscription.

Highlights
  • Module-based exam preparation
  • Explanation on every question
  • Interactive drills for practical skills
  • Class management and student tracking
  • Progressive unlocking of study modules
  • Daily practice with built-in tutor
Features
Read full description

Binnacle School — USCG Captain's License Exam Prep Study for your U.S. Coast Guard captain's license the way the exam actually works: by module, at your own pace, with an explanation on every question. Whether you're going for an OUPV / Six-Pack, OUPV-Master, or a 100- or 200-Ton Master credential, Binnacle School breaks the written exam into the same categories the Coast Guard tests. WHAT YOU STUDY - Navigation Rules (COLREGS / Inland) — lights, shapes, sound signals, give-way and stand-on. The most heavily weighted module on every deck exam. - Navigation General — piloting, tides and currents, aids to navigation, dead reckoning. - Deck General — seamanship, ground tackle, stability, firefighting, vessel construction. - Chart Plotting — set and drift, course to steer, lines of position, fixing your position. - Meteorology and Safety, scaling up to Celestial Navigation and Radar for the 200-Ton exam. FREE TO START Three full modules — Rules of the Road, Safety, and Meteorology — are open to everyone, no account required. Get free daily practice with an explanation from the built-in tutor. PASS TO UNLOCK Clear a module (80% over 20+ questions) and the next one opens. Build toward your specific license target one category at a time, in the sequence the exam follows. INTERACTIVE TRAINERS Drill the visual, hands-on parts the way they're tested: navigation lights, knots, chart work, celestial sights, stability, maneuvering boards, and tides. CLASSES Teaching a license course? Create a class, share a join code, and track every student's accuracy, attempts, and activity from one roster. Open specific modules for your students as they're ready. GO PRO Unlock every module, remove daily limits, and get unlimited tutor explanations. Sign in with Apple, Google, or a one-time email code. Fair winds and a following sea.

Screenshots

Neptune4 screens
Binnacle School4 screens

Verdict

The call

The clearest difference is in-app purchases: Neptune at none against Binnacle School's 3. Neptune also leads on ratings volume (15 vs 1) and iOS requirement (15.0 vs 17.0). On price, rating, update cadence and ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Binnacle School sells 3 in-app purchases, starting at $4.99 per month. Neptune asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Neptune against 5.0 for Binnacle School. That said, the two scores are not equally well evidenced: Neptune has 15 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Neptune ships an update every 4 days, Binnacle School weekly. The most recent releases landed on October 10, 2026 and September 30, 2026 respectively.

Scorecard4 real differences · 6 level
Neptune versus Binnacle School: the parameters behind the verdict, then further details
ParameterNeptuneBinnacle School
PriceFreeFree
Rating5.0 (15 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings15 — better1
Update frequencyEvery 4 days — betterWeekly
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better17.0
Further details — not scored
Size96 MB3 MB
Age rating4+4+
DeveloperBrice BrownJohn Thomas

In-app purchases

None

Neptune

No in-app purchases

3 purchases

Binnacle School

Subscriptions2
  • Binnacle School Premium$4.991 Month
  • Binnacle School Premium$29.991 Year
One-time1
  • Lifetime Access$79.99

Questions

Is Neptune free?
Neptune is free to download, with no in-app purchases.
Is Binnacle School free?
Binnacle School is free to download, with in-app purchases available.
Which has better reviews, Neptune or Binnacle School?
Neptune and Binnacle School are both rated 5.0 out of 5 on the App Store, from 15 and 1 ratings respectively.
Do Neptune or Binnacle School have ads?
Neither Neptune nor Binnacle School shows ads.
Which is updated more often, Neptune or Binnacle School?
Neptune ships an update every 4 days, and Binnacle School weekly. Most recently, Neptune was updated on October 10, 2026 and Binnacle School on September 30, 2026.

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