Comparison

PRO CHARTS vs Rule Master

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

Head to head
About

PRO CHARTS

Navigate marine environments with detailed nautical charts and route planning. Track your location, find friends on the water, and share your trip details for safety. Offline chart access ensures reliable navigation even without an internet connection.

Highlights
  • High-resolution NOAA nautical charts
  • Offline chart access
  • Waypoint and route creation
  • Buddy tracking
  • Float plan sharing
  • Point-and-steer navigation
  • Track recording
Features
Read full description

MiraTrex PRO CHARTS™ is a powerful, yet easy-to-use marine navigation system. Whether you’re a fisherman, weekend cruiser, sailor, diver, jet-skier, or an offshore captain needing to find an exact location hundreds of miles offshore, PRO CHARTS™ will get you there and back home safely – with nothing more than your iPhone or iPad. Key Features: • High-resolution NOAA nautical chart coverage with depths for all U.S. coastal areas, the Great Lakes, major U.S. river systems, and Brazil plus global high-level nautical charts. Charts are automatically updated based on NOAA chart corrections. • Easy one-touch Waypoint and Route creation. Pre-plan your routes at home or create them at sea with equal ease. Just touch the screen to create new waypoints and routes. • Find your friends on the water. With our new Buddy-tracking feature, you can see and meet up with your friends while you’re out on the water. If you’re on your secret spot and don’t want to be seen, you can hide your location with the touch of a button. • Stay safe. Easily create and send a Float Plan of your trip to a friend or family member. Your Float Plan and location history can be forwarded to search and rescue personnel in case of an emergency. • Easy point-and-steer navigation. The red heading bug on the large on-screen compass always directs you to the next point on your route. Navigation is as easy as pointing your boat at the heading bug to stay on course. • No Network. No Problem. PRO CHARTS™ is designed so no internet connection is required to view your charts while out on the water. You simply download in advance any charts you’ll need at sea with the touch of a button. • Record your tracks. Track your position in real-time and later view your track history. • Fully indexed point of interest (POI) database including weather, aids to navigation (markers and lights), obstructions, tides, currents, your buddies, and more. Website: www.miratrex.com -------------------- Plans: Base app with limited features - Free 14 day trial of all premium features - Free All premium features (Monthly) - $2.99 All premium features (Annual) - $29.99 (Save 16%, about 2 months free) -Payment will be charged to your iTunes Account at confirmation of purchase. -Your subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current subscription period. -You will be charged for renewal within 24 hours prior to the end of the current period, for the same duration and at the current subscription rate for that product. -You can manage your subscriptions and turn off auto-renewal by going to your Account Settings in the Apple Settings app after purchase. -No cancellation of the current subscription is allowed during active subscription period. This does not affect your statutory rights. -Any unused portion of a free trial period, if offered, will be forfeited when you purchase a subscription. -We will be collecting information about your use of the app both when you are online and offline. To find out more please see our privacy policy. -------------------- By purchasing a subscription or downloading an app you agree that you have read and accept our Privacy Policy and Terms of Use. http://www.miratrex.com/procharts/terms-of-use/ http://www.miratrex.com/procharts/privacy/ NOTE: Continued use of GPS running in the background can dramatically decrease battery life. Though PRO CHARTS™ will function without a GPS as a chart reader, a GPS-enabled device is required for point-to-point navigation. Third-party Bluetooth GPS units are available to enable GPS for iOS devices such as WiFi-only iPads that do not include a GPS receiver. For offline use where no Internet connection is available, charts must be pre-cached while still on-line and connected, any charts downloaded while online will be available for offline use.

About

Rule Master

Master maritime navigation rules with this comprehensive quiz app. It offers extensive question banks, custom filters, and detailed progress tracking for both new and experienced sailors. Generate custom exams and access a digital handbook for efficient learning and exam preparation.

Highlights
  • 10,000+ question-answer combinations
  • Custom question filters
  • Fill-in-the-blank questions
  • Offline capability
  • Exam PDF generation
  • Digital Navigation Rules handbook
  • Progress tracking and statistics
Features
Currently charting
Read full description

The most advanced, modern, and competitive Rules of the Road quiz application on the iOS App Store! This Navigation Rules quiz application is a must-have for new and experienced sailors, alike. This complete Rules of the Road toolbox is the most effective way to build and maintain proficiency, so you can spend less time preparing for your next USCG Navigation Rules examination. Track your progress like never before, and use our advanced question filters and rule proficiency statistics for efficient, targeted studying. Are you an instructor? Generate and print beautiful, custom-filtered COLREG examinations in seconds with our advanced exam PDF generation algorithm. Are you an experienced mariner? There is always more to learn! Rule Master provides 100+ hand-selected, fill-in-the-blank questions optimized to refine your mastery of the Rules of the Road. Mastery of these verbatim COLREG excerpts allows for intelligent verbal communication of the rules — especially useful for students undergoing rigorous training at the USN Mariner Skills Training Command. - 10,000+ question-answer combinations - Advanced, custom question filters for targeted studying - 100+ hand-selected, fill-in-the-blank questions for experienced Mariners - Full offline capability - Unlimited exam PDF generation and printing - Full, digital Navigation Rules handbook for quick reference - In-depth progress tracking and statistics This COLREG application's abbreviated question bank -- tediously hand-scrubbed and optimized by an experienced USN Surface Warfare Officer -- is coupled with a custom algorithm that generates 10,000+ unique question-answer combinations specifically designed to more effectively teach and examine student knowledge while simultaneously exposing students to the confusing vernacular commonly found in the infamous USCG Rules of the Road question bank.

Screenshots

PRO CHARTS4 screens
Rule Master4 screens

Verdict

The call

The clearest difference is price: PRO CHARTS at Free against Rule Master's $9.99. PRO CHARTS also leads on ratings volume (8.5K vs 296) and device support (3 vs 1). Rule Master's advantage is in-app purchases (none vs 4) and review sentiment (43% vs 17%). On update cadence, ads, monetization model and iOS requirement 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

PRO CHARTS is free to download; Rule Master costs $9.99 up front. PRO CHARTS sells 4 in-app purchases, starting at $2.99 per month. Rule Master asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Rule Master holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: PRO CHARTS has 8.5K ratings behind it against 296, so its average is the more settled of the two. Written reviews point the same way: 17% of PRO CHARTS's written reviews are positive against 43% of Rule Master's.

UpkeepUpdate frequency

PRO CHARTS ships an update every 2 months, Rule Master every 3 months. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

Scorecard7 real differences · 4 level
PRO CHARTS versus Rule Master: the parameters behind the verdict, then further details
ParameterPRO CHARTSRule Master
PriceFree — better$9.99
Rating4.5 (8.5K ratings)4.8 (296 ratings) — better
Positive reviews17.2% of reviews42.9% of reviews — better
Number of ratings8.5K — better296
Update frequencyEvery 2 months — betterEvery 3 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#178#55 — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.6 — better16.0
Further details — not scored
Size48 MB13 MB
Age rating4+4+
DeveloperMiraTrex, Inc.Universal Queue LLC

Customer experience

PRO CHARTS

All ratings8,499 ratings
Positive88.3%
Neutral4.1%
Negative7.6%
Written reviews99 reviews
Positive17.2%
Neutral8.1%
Negative74.7%

Rule Master

All ratings292 ratings
Positive94.9%
Neutral3.8%
Negative1.4%
Written reviews14 reviews
Positive42.9%
Neutral28.6%
Negative28.6%

User reviews

PRO CHARTS

From 8.5K App Store ratings

What we love

  • 🚀 Great for navigation
  • 🗺️ Helpful for coastal areas
  • 👍 Useful app overall

Room to improve

  • 🐛 Frequent crashes and glitches
  • ⚠️ Subscription issues and hidden costs
  • 🌐 Lacks coverage for non-US regions
  • 🔒 Poor account management and support

Rule Master

From 296 App Store ratings

What we love

  • 👍 User friendly and easy to navigate
  • 📚 Great information for studying and review
  • 💯 Helpful for exam preparation and confidence
  • ✨ Beautifully designed and functional app
  • ✅ Worth a download

Room to improve

  • 💰 Free apps are just as good
  • 🐛 Questions disappear off the screen
  • 🤏 Diagrams are too small to see details
  • ❓ Incomplete questions with missing text
  • ⚠️ Some answers are not 100% accurate

Bugs and requests

PRO CHARTS

Reported bugs

3 issues
  • Charts not loading or disappearing
  • Subscription not recognized
  • Login/account issues

Requested features

3 requests
  • Offline map downloads
  • Depth and hazard data
  • Better route planning tools

Rule Master

Reported bugs

5 issues
  • Questions disappear off the bottom of the screen
  • Diagrams are too small to identify vessels
  • Some questions have character limits over the margin
  • App doesn't display quiz and verbatim in a usable manner
  • Incomplete questions showing three dots (...)

Requested features

4 requests
  • Link relevant COLREG rule when answering correctly and incorrectly
  • Expand subjects to include chemistry or history
  • Improvements in tracking missed questions for training
  • Display full question text when it's cut off

In-app purchases

4 purchases

PRO CHARTS

Subscriptions2
  • 1 Year Auto Renewing Subscription14 Days trial$2.991 Month
  • 1 Year Auto Renewing Subscription14 Days trial$29.991 Year
One-time2
  • Brazil - Nautical Charts$4.99
  • 1 Year Subscription$29.99
None

Rule Master

No in-app purchases

Questions

Is PRO CHARTS free?
PRO CHARTS is free to download, with in-app purchases available.
Is Rule Master free?
Rule Master costs $9.99, with no in-app purchases.
Which has better reviews, PRO CHARTS or Rule Master?
Rule Master is rated higher. PRO CHARTS averages 4.5 out of 5 from 8.5K ratings, while Rule Master averages 4.8 from 296 ratings.
Do PRO CHARTS or Rule Master have ads?
Neither PRO CHARTS nor Rule Master shows ads.
Which is updated more often, PRO CHARTS or Rule Master?
PRO CHARTS ships an update every 2 months, and Rule Master every 3 months. Most recently, PRO CHARTS was updated on November 1, 2026 and Rule Master on October 30, 2026.
Which is more popular, PRO CHARTS or Rule Master?
PRO CHARTS currently peaks at #178 in the App Store charts, and Rule Master at #55. Chart position reflects recent download velocity rather than total install base.

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