# Marinus vs Ship Structure

The clearest difference is rating: Marinus at 4.4 against Ship Structure's 3.7. Marinus also leads on ratings volume (215 vs 3). Ship Structure's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price and device support there is nothing between them.

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

Marinus holds the better App Store score, 4.4 against 3.7. That said, the two scores are not equally well evidenced: Marinus has 215 ratings behind it against 3, so its average is the more settled of the two.

## The numbers

| Metric | Marinus | Ship Structure |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (215 ratings)](https://appshunter.io/ios/app/marinus-maritime-rules/id536108872/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/ship-structure/id1472612603/reviews) |
| Number of ratings | **215** | 3 |
| Positive reviews | 65.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | — |
| Monetization | Free with in-app purchases | **Free** |
| Size | 113 MB | 97 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Alejandro](https://appshunter.io/developer/476976572) | [Huntington Ingalls](https://appshunter.io/developer/1014470325) |

## 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


### Ship Structure

[App page](https://appshunter.io/ios/app/ship-structure/id1472612603)

Explore a detailed 3D ship model to learn maritime terminology. Features guided tours, free exploration, and scavenger hunts to test your knowledge. Ideal for anyone interested in naval architecture and ship construction.

**Highlights:** Interactive 3D ship model, Guided tours of ship components, Free exploration mode, Scavenger hunt challenges, Industry-standard definitions, ARKit integration, Intuitive touch interactions

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Marinus free?

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

### Is Ship Structure free?

Ship Structure is free to download, with no in-app purchases.

### Which has better reviews, Marinus or Ship Structure?

Marinus is rated higher. Marinus averages 4.4 out of 5 from 215 ratings, while Ship Structure averages 3.7 from 3 ratings.

### Do Marinus or Ship Structure have ads?

Marinus shows ads; Ship Structure does not.

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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.*