Comparison

Rák vs Master

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

Head to head
About

Rák

Features
Read full description

Simuleringar av rákinum kring oyggjarnar. Til ber at velja tíð og síðan síggja eitt kort yvir rákið. Til ber eisini at síggja døgn yvirlit yvir útvald støð í Føroyum.

About

Master

Learn maritime navigation rules with an interactive system designed for effective retention. This app breaks down complex regulations into manageable sections with visual aids and mnemonics. It revisits incorrect answers and provides instant graphical feedback, making the learning process intuitive and efficient.

Highlights
  • Interactive learning system
  • Step-by-step rule guidance
  • Mnemonics and memory aids
  • Interactive visuals
  • Graphical feedback on answers
  • Practice section with progress tracking
Features
Read full description

Master-Nav is a progressive COLREGS learning system developed by a Master Mariner. The COLREGS are notoriously difficult to learn and retain — Master-Nav makes it significantly easier through an interactive system built around how your brain actually works. Instead of guessing through random question banks, Master-Nav guides you step by step through every rule from start to finish. Wrong answers are revisited until the rules stick — properly. Complex regulations are broken down into learnable chunks — bite-sized sections supported by mnemonics, memory aids and interactive visuals designed around how the brain actually retains information. Every incorrect answer is shown graphically alongside the correct one — immediately clear, no confusion. And with a single tap, the relevant COLREGS rule is accessible from any question at any time. Master-Nav covers COLREGS Parts A to D — General, Steering & Sailing, Lights & Shapes and Sound & Light Signals — plus Annex IV Distress Signals. Over 1000 questions in multiple formats, with a dedicated Practice Section that tracks right, wrong and unanswered so you always know where to focus. COLREGS — the easy way.

Screenshots

Rák1 screens
Master4 screens

Verdict

The call

The clearest difference is price: Rák at Free against Master's $1.99. Rák also leads on iOS requirement (8.0 vs 15.0). Master's advantage is update cadence (fortnightly vs every 2 months). On ads, in-app purchases and device support 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

Rák is free to download; Master costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Rák ships an update every 2 months, Master fortnightly. The most recent releases landed on October 26, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 7 level
Rák versus Master: the parameters behind the verdict, then further details
ParameterRákMaster
PriceFree — better$1.99
Rating—4.8 (100 ratings) — better
Positive reviews—96.9% of reviews
Number of ratings—100 — better
Update frequencyEvery 2 monthsFortnightly — better
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS8.0 — better15.0
Further details — not scored
Size33 MB117 MB
Age rating4+4+
DeveloperBogi MagnussenPeterjohn Chisholm

In-app purchases

None

Rák

No in-app purchases

None

Master

No in-app purchases

Questions

Is Rák free?
Rák is free to download, with no in-app purchases.
Is Master free?
Master costs $1.99, with no in-app purchases.
Do Rák or Master have ads?
Neither Rák nor Master shows ads.
Which is updated more often, Rák or Master?
Rák ships an update every 2 months, and Master fortnightly. Most recently, Rák was updated on October 26, 2026 and Master on October 30, 2026.

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