# Neptune vs Decoded

The clearest difference is in-app purchases: Neptune at none against Decoded's 2. Decoded's advantage is update cadence (daily vs every 4 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Decoded sells 2 in-app purchases, starting at $6.99 per month. Neptune asks for nothing beyond the download.

Neptune ships an update every 4 days, Decoded daily. Both last shipped on October 25, 2026.

## The numbers

| Metric | Neptune | Decoded |
| --- | --- | --- |
| 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 | **Daily** |
| Monetization | Free | — |
| Size | 96 MB | 10 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Brice Brown](https://appshunter.io/developer/1555846025) | [MATTHEW JAMES COLEBORNE](https://appshunter.io/developer/1891719124) |

## 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


### Decoded

[App page](https://appshunter.io/ios/app/decoded-social-translator/id6761838903)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Decoded Pro | $6.99 | per month |
| Decoded Pro | $49.99 | per year |


## Frequently asked questions

### Is Neptune free?

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

### Is Decoded free?

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

### Do Neptune or Decoded have ads?

Neither Neptune nor Decoded shows ads.

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

Neptune ships an update every 4 days, and Decoded daily. Most recently, Neptune was updated on October 25, 2026 and Decoded on October 25, 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.*