Adel Mostafa Software vs Master
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Adel Mostafa Software
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Adel Mostafa app is a must have application for my sons and fellow naval officers and any other person interested in celestial navigation as a science to benefit from to help them to calculate the time of occurrence of any natural phenomenon for a sailing ship Therefore, the navigator resorts to applying the method of successive approximation. It features Rhumb Line (Lat. & Long.), Rhumb Line (T.Co. & Dist.), Compass Error (Time Method), Compass Error (Amplitude Method), Star Chart, Meridian Passage, Sun Sight, Sun Run Sun, Star Sight, Universal Method, Egyptian Method, Unknown Star Identification, Equation of Time; Coordinates of the Sun & Aries, Prayer Time. The results are within 10-15 seconds which is accurate enough for sea.
Master
Practice maritime navigation rules and buoyage systems with this app. It helps you identify knowledge gaps and track your progress in mastering essential regulations for mariners.
- USCG Navigation Rules practice
- IALA Maritime Buoyage System tests
- Knowledge gap identification
- Progress tracking
- Developed by Master Mariner
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Master-Nav: COLREGS IALA Tests is a free practice app developed by a Master Mariner with 30 years of seagoing experience. Test your knowledge of the USCG Navigation Rules and IALA Maritime Buoyage System — the regulations every mariner needs to know. A straightforward way to find out where you stand, identify gaps in your knowledge and track your progress over time. Master COLREGS & IALA — the easy way.
Screenshots
Verdict
The clearest difference is device support: Adel Mostafa Software at 3 against Master's 1. Adel Mostafa Software also leads on iOS requirement (11.0 vs 17.6). On price, update cadence, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Adel Mostafa Software ships an update every 2 weeks, Master fortnightly. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.
| Parameter | Adel Mostafa Software | Master |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 weeks | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 11.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 46 MB | 305 MB |
| Age rating | 4+ | 4+ |
| Developer | Olymp Soft FZE | Peterjohn Chisholm |
In-app purchases
Adel Mostafa Software
No in-app purchases
Master
No in-app purchases
Questions
Is Adel Mostafa Software free?
Is Master free?
Do Adel Mostafa Software or Master have ads?
Which is updated more often, Adel Mostafa Software or Master?
Other comparisons
