# Neptune vs CaptainsGround

The clearest difference is in-app purchases: Neptune at none against CaptainsGround's 3. Neptune also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price and ads there is nothing between them.

Both are free to download. CaptainsGround sells 3 in-app purchases, starting at $39.00 per month. Neptune asks for nothing beyond the download.

## The numbers

| Metric | Neptune | CaptainsGround |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (17 ratings)](https://appshunter.io/ios/app/neptune-navigation-rules/id6756641315/reviews)** | — |
| Number of ratings | **17** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | — |
| Monetization | Free | — |
| Size | 96 MB | 16 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Brice Brown](https://appshunter.io/developer/1555846025) | [Northpine Labs LLC](https://appshunter.io/developer/6798773997) |

## What reviewers say

### Neptune

[App page](https://appshunter.io/ios/app/neptune-navigation-rules/id6756641315)

Prepare for USCG COLREG and OOD exams with a comprehensive study system. Features AI tutoring, interactive 3D visuals for lights and shapes, and a complete question bank with intelligent test modes and progress tracking.

**Highlights:** AI-powered tutor for rule explanations, Interactive 3D lights and shapes trainer, Official USCG question bank, Verbatim memory trainer, Intelligent exam simulator modes, Advanced progress tracking, Offline study capability

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

**In-app purchases:** none


### CaptainsGround

[App page](https://appshunter.io/ios/app/captainsground-uscg-exam-prep/id6798773995)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $39.00 | per month |
| Exam Prep Pass | $79.00 | one-time |
| Until You Pass | $149.00 | one-time |


## Frequently asked questions

### Is Neptune free?

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

### Is CaptainsGround free?

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

### Do Neptune or CaptainsGround have ads?

Neither Neptune nor CaptainsGround shows ads.

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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.*