# Marinus vs Maritime Knowledge

The clearest difference is in-app purchases: Maritime Knowledge at none against Marinus's 1. Maritime Knowledge also leads on ads (none vs shown) and review sentiment (100% vs 65%). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Marinus sells 1 in-app purchase, starting at $8.99 per year. Maritime Knowledge asks for nothing beyond the download.

Marinus ships an update every 5 weeks, Maritime Knowledge monthly. The most recent releases landed on October 24, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Marinus | Maritime Knowledge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (215 ratings)](https://appshunter.io/ios/app/marinus-maritime-rules/id536108872/reviews)** | — |
| Number of ratings | **215** | — |
| Positive reviews | 65.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Monthly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 113 MB | 40 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Alejandro](https://appshunter.io/developer/476976572) | [MTECH COMMERCE AND BUSINESS SOLUTIONS PRIVATE LIMITED](https://appshunter.io/developer/1141333645) |

## What reviewers say

### Marinus

[App page](https://appshunter.io/ios/app/marinus-maritime-rules/id536108872)

This app provides comprehensive guidance on maritime navigation rules and signals. It offers detailed information on flags, lights, sounds, and buoyage systems, along with interactive quizzes and a map feature. Designed for sailors, it ensures safe navigation on any vessel.

**Highlights:** Maritime flags and meanings, Weather scales and cloud identification, Sound signal guidance, Vessel navigation light diagrams, Day shape identification, Safe navigation maneuvers, Morse code decoder, IALA Buoyage System, Radio communication guidelines, COLREGs text

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Marinus PRO | $8.99 | per year |

**What reviewers like**

- 👍 Great app for learning
- 👍 Useful study aid
- 👍 Very helpful for mariners
- 👍 Good information provided
- 👍 Easy to use

**What reviewers complain about**

- 👎 Swamped with ads
- 👎 Broken app functionality
- 👎 Subscription model is a money grab
- 👎 Lifetime pro withdrawn
- 👎 Scam for changing to subscription

**Reported bugs**

- App not working, ads won't clear
- App crashes frequently
- Mistake with sounds
- App crashes after 10-15 seconds

**Requested features**

- Settings for Buoyage A & B & combined
- Search feature
- Combine sounds and lights
- Add tides information
- More free version functionality


### Maritime Knowledge

[App page](https://appshunter.io/ios/app/maritime-knowledge/id1488568770)

This application offers comprehensive marine education resources, including structured study materials and video lectures from experienced professors. It aims to provide accessible, quality learning for marine students worldwide, saving them time and energy.

**Highlights:** Online study materials, Video lectures, Structured curriculum, Experienced professors, Accessible worldwide, Student-friendly interface

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Marinus free?

Marinus is free to download, with in-app purchases available.

### Is Maritime Knowledge free?

Maritime Knowledge is free to download, with no in-app purchases.

### Do Marinus or Maritime Knowledge have ads?

Marinus shows ads; Maritime Knowledge does not.

### Which is updated more often, Marinus or Maritime Knowledge?

Marinus ships an update every 5 weeks, and Maritime Knowledge monthly. Most recently, Marinus was updated on October 24, 2026 and Maritime Knowledge on October 11, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*