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COLREG is a navigation reference tool designed to help mariners understand and apply the International Regulations for Preventing Collisions at Sea. The app provides visual and auditory guides to assist users in identifying vessel activities and communicating effectively while at sea.

Overview · Full Intel report in progress

The App DNA

What makes this app unique?

For The app is intended for professional mariners and maritime enthusiasts seeking a reference guide for collision prevention regulations.

What does it look like?

Key features

Ship Lightsstandard

A guide to identifying vessels and their operational status based on specific light configurations.

Daily Shapesstandard

A reference tool for interpreting maritime day shapes and their corresponding meanings.

Sound Signalsstandard

A library of sound signals used to facilitate communication and safety between vessels.

How much does it cost?

paid

Velocity

Dormant developmentShow more...

4 versions in history. Development pace: zombie.

See all version history

Who built it?

Oleksandr Kuzmychov

4 apps tracked · Navigation

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User Sentiment

What do users think recently?

How are ratings & reviews evolving?

App Store
0.00 · 0
Google Play
0.00 · 0

Not enough recent reviews to extract reliable themes yet.

Read the full review analysis

Competition

Competitive landscape for COLREG

How's the Navigation market?

The rivals identified

Navigation Rules Pro
Navigation Rules Proactive nemesis

By Calculated Industries

Both apps target maritime professionals and enthusiasts with regulatory reference material for collision prevention. Navigation Rules Pro competes by bundling regulatory text with practical utility tools like calculators and unit conversions.

  • Navigation Rules Pro includes Inland Navigation Rules, while COLREG focuses solely on international standards.
  • Navigation Rules Pro bundles practical utility tools like boating calculators and unit conversions, which COLREG lacks.
  • Navigation Rules Pro maintains a 4.8-star rating across 437 reviews, indicating established user trust.
Compare head-to-head
COLREG vs Navigation Rules Pro
CoNavCoNavContenderMarine Chart SymbolsMarine Chart SymbolsContenderNautical Calculator ProNautical Calculator ProContenderELECTRONIC NAUTICAL CHART SYMBOLS & ABBREVIATIONSELECTRONIC NAUTICAL CHART SYMBOLS & ABBREVIATIONSContenderCircle Of Position NavigationCircle Of Position NavigationContenderNav Rules: COLREGS Exam PrepNav Rules: COLREGS Exam PrepContenderColRegs: Nav Lights & ShapesColRegs: Nav Lights & ShapesContenderSailing Log — Ship's LogbookSailing Log — Ship's LogbookContender

Unlock the head-to-head verdict: where this rival wins, and where it loses.

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The Analyst's Read

Key takeaways for COLREG

Where is it heading?

Bottom line

COLREG serves as a specialized digital reference guide for maritime safety regulations and vessel identification.

Report last updated

Disclosure: Independent intel to help mobile builders succeed.

AI-powered analysis with automated quality gates, built from publicly available sources. Marlvel.ai is not affiliated with, endorsed by, or sponsored by COLREG, its developer, the app publisher, Apple, or Google Play. All trademarks, logos, and screenshots referenced remain the property of their respective owners.

Cite this report

Marlvel.ai. “COLREG Intelligence Report.” Updated May 4, 2026. https://marlvel.ai/apps/com-oleksandrkuzmychovapp

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