# Nautical Dog Math Helper vs Interp Calculator

The clearest difference is price: Nautical Dog Math Helper at Free against Interp Calculator's $0.99. Nautical Dog Math Helper also leads on update cadence (weekly vs every 15 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Nautical Dog Math Helper is free to download; Interp Calculator costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Nautical Dog Math Helper ships an update weekly, Interp Calculator every 15 months. The most recent releases landed on November 4, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Nautical Dog Math Helper | Interp Calculator |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| 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** | Every 15 months |
| Monetization | Free | — |
| Size | 6 MB | 22 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jill Russell](https://appshunter.io/developer/1792014832) | [Stanislav Soroka](https://appshunter.io/developer/1701402639) |

## 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


### Interp Calculator

[App page](https://appshunter.io/ios/app/interp-calculator/id6747821560)

**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 Interp Calculator free?

Interp Calculator costs $0.99, with no in-app purchases.

### Do Nautical Dog Math Helper or Interp Calculator have ads?

Neither Nautical Dog Math Helper nor Interp Calculator shows ads.

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

Nautical Dog Math Helper ships an update weekly, and Interp Calculator every 15 months. Most recently, Nautical Dog Math Helper was updated on November 4, 2026 and Interp Calculator on October 6, 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.*