# Neptune vs CBDR

The clearest difference is update cadence: Neptune at every 2 days against CBDR's weekly. Neptune also leads on ratings volume (13 vs 4) and iOS requirement (13.0 vs 17.0). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Neptune against 5.0 for CBDR. Both are backed by a comparable volume of ratings — 13 and 4 respectively.

Neptune ships an update every 2 days, CBDR weekly. The most recent releases landed on September 8, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Neptune | CBDR |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (13 ratings)](https://appshunter.io/ios/app/neptune-navigation-rules/id6756641315/reviews) | [5.0 (4 ratings)](https://appshunter.io/ios/app/cbdr/id6792199258/reviews) |
| Number of ratings | **13** | 4 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Weekly |
| Monetization | Free | Free |
| Size | 101 MB | 72 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Brice Brown](https://appshunter.io/developer/1555846025) | [Sean Bowman](https://appshunter.io/developer/6792199260) |

## 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


### CBDR

[App page](https://appshunter.io/ios/app/cbdr/id6792199258)

This app trains junior deck officers and watchstanders in essential radar watch skills, including contact evaluation, COLREGS classification, and generating contact reports. It features a live radar scope, generated scenarios for various navigation situations, and drills for recognition and maneuvering.

**Highlights:** Live radar scope with vectors and trails, Generated navigation scenarios, COLREGS classification, Contact report scoring, Maneuvering board drills, Recognition drills, USCG Rules of the Road test bank, Offline group testing

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

**In-app purchases:** none


## Frequently asked questions

### Is Neptune free?

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

### Is CBDR free?

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

### Which has better reviews, Neptune or CBDR?

Neptune and CBDR are both rated 5.0 out of 5 on the App Store, from 13 and 4 ratings respectively.

### Do Neptune or CBDR have ads?

Neither Neptune nor CBDR shows ads.

### Which is updated more often, Neptune or CBDR?

Neptune ships an update every 2 days, and CBDR weekly. Most recently, Neptune was updated on September 8, 2026 and CBDR on September 18, 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.*