# Neptune vs HELMS by ISF

The clearest difference is update cadence: Neptune at every 4 days against HELMS by ISF's every 2 weeks. On price, ads, in-app purchases and device support there is nothing between them.

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

Neptune ships an update every 4 days, HELMS by ISF every 2 weeks. The most recent releases landed on October 25, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Neptune | HELMS by ISF |
| --- | --- | --- |
| 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 | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 2 weeks |
| Monetization | Free | — |
| Size | 96 MB | 32 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Brice Brown](https://appshunter.io/developer/1555846025) | [Pushkal Kapoor](https://appshunter.io/developer/1896232263) |

## 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


### HELMS by ISF

[App page](https://appshunter.io/ios/app/helms-by-isf/id6766196478)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Neptune free?

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

### Is HELMS by ISF free?

HELMS by ISF is free to download, with no in-app purchases.

### Do Neptune or HELMS by ISF have ads?

Neither Neptune nor HELMS by ISF shows ads.

### Which is updated more often, Neptune or HELMS by ISF?

Neptune ships an update every 4 days, and HELMS by ISF every 2 weeks. Most recently, Neptune was updated on October 25, 2026 and HELMS by ISF on October 7, 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.*