Comparison

ICS vs Neptune

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

Head to head
About

ICS

Features
Read full description

Do you want to read signal flags confidently, know Morse code and the phonetic alphabet (NATO/ICAO) and speak the language of sailors? This app is your guide to the International Code of Signals (ICS). App features: • A complete set of signals: learn the phonetic alphabet (Alpha, Bravo, Charlie...), signal flags and Morse code. • Correct pronunciation: learn not only to write but also to speak correctly. • Effective memorization: consolidate your knowledge with the help of tests. • Progress and statistics: track your progress in each section and set records in tests. • Works offline: study anywhere: at sea, on a yacht or at home without the Internet. Who is this app for? This app is for sailors and captains, yachtsmen, cadets of maritime educational institutions, radiotelegraph operators and everyone who is interested in the sea. Learn visual and sound signals with the help of tests and voice acting. Download now and start learning the language of the sea.

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.

Screenshots

ICS4 screens
Neptune4 screens

Verdict

The call

The clearest difference is price: Neptune at Free against ICS's $2.99. Neptune also leads on update cadence (every 4 days vs every 9 months) and device support (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

CostPrice · In-app purchases · Ads · Monetization

Neptune is free to download; ICS costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

ICS ships an update every 9 months, Neptune every 4 days. The most recent releases landed on November 8, 2026 and November 5, 2026 respectively.

Scorecard4 real differences · 6 level
ICS versus Neptune: the parameters behind the verdict, then further details
ParameterICSNeptune
Price$2.99Free — better
Rating—5.0 (17 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—17 — better
Update frequencyEvery 9 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS17.015.0 — better
Further details — not scored
Size3 MB96 MB
Age rating4+4+
DeveloperSmirnov YuryBrice Brown

In-app purchases

None

ICS

No in-app purchases

None

Neptune

No in-app purchases

Questions

Is ICS free?
ICS costs $2.99, with no in-app purchases.
Is Neptune free?
Neptune is free to download, with no in-app purchases.
Do ICS or Neptune have ads?
Neither ICS nor Neptune shows ads.
Which is updated more often, ICS or Neptune?
ICS ships an update every 9 months, and Neptune every 4 days. Most recently, ICS was updated on November 8, 2026 and Neptune on November 5, 2026.

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