# Nautical Dog Math Helper vs RigCheck

The clearest difference is price: Nautical Dog Math Helper at Free against RigCheck's $2.99. Nautical Dog Math Helper also leads on update cadence (weekly vs monthly). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Nautical Dog Math Helper is free to download; RigCheck costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Nautical Dog Math Helper ships an update weekly, RigCheck monthly. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Nautical Dog Math Helper | RigCheck |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/nautical-dog-math-helper/id6744040776/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Monthly |
| Monetization | Free | — |
| Size | 6 MB | 6 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jill Russell](https://appshunter.io/developer/1792014832) | [Stolk.cc](https://appshunter.io/developer/313529099) |

## What reviewers say

### Nautical Dog Math Helper

[App page](https://appshunter.io/ios/app/nautical-dog-math-helper/id6744040776)

This app simplifies essential maritime calculations for professionals. It offers tools for navigation, maneuvering, and vessel operations, ensuring accuracy and efficiency at sea. Designed for ease of use, it provides critical data even without internet access.

**Highlights:** Rate of Turn (ROT) Calculation, Turn Transfer Computation, RPM and Speed Calculations, Anchor Swing Radius, Distance, Speed, Time (DST), Offline Functionality, Night Mode

**Features:** macOS Compatibility

**In-app purchases:** none


### RigCheck

[App page](https://appshunter.io/ios/app/rigcheck-rigging-inspector/id6758738427)

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

**In-app purchases:** none


## Frequently asked questions

### Is Nautical Dog Math Helper free?

Nautical Dog Math Helper is free to download, with no in-app purchases.

### Is RigCheck free?

RigCheck costs $2.99, with no in-app purchases.

### Do Nautical Dog Math Helper or RigCheck have ads?

Neither Nautical Dog Math Helper nor RigCheck shows ads.

### Which is updated more often, Nautical Dog Math Helper or RigCheck?

Nautical Dog Math Helper ships an update weekly, and RigCheck monthly. Most recently, Nautical Dog Math Helper was updated on October 24, 2026 and RigCheck on October 28, 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.*