# Nautical Calculator Pro vs COLREG

The clearest difference is review sentiment: Nautical Calculator Pro at 60% against COLREG's 0%. Nautical Calculator Pro also leads on update cadence (every 2 months vs every 7 months). COLREG's advantage is price ($0.99 vs $8.99) and iOS requirement (12.0 vs 15.0). On ads, in-app purchases, monetization model and device support there is nothing between them.

Nautical Calculator Pro costs $8.99 and COLREG $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Nautical Calculator Pro ships an update every 2 months, COLREG every 7 months. The most recent releases landed on September 17, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Nautical Calculator Pro | COLREG |
| --- | --- | --- |
| Price | $8.99 | **$0.99** |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/nautical-calculator-pro/id1455851003/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | **60.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 7 months |
| Monetization | Paid | Paid |
| Size | 27 MB | 133 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Giacomo Gabriele](https://appshunter.io/developer/1455745031) | [Oleksandr Kuzmychov](https://appshunter.io/developer/1623095994) |

## What reviewers say

### Nautical Calculator Pro

[App page](https://appshunter.io/ios/app/nautical-calculator-pro/id1455851003)

This app provides comprehensive tools for solving complex nautical navigation calculations, including route planning, celestial navigation, and tidal predictions. It features a world map for route visualization and offline functionality for map display.

**Highlights:** Route calculation, Point on Rhumb Line/Great Circle, Celestial navigation, Tidal calculations, Wind calculation, Nautical almanac, World map visualization

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

**In-app purchases:** none


### COLREG

[App page](https://appshunter.io/ios/app/colreg/id6446209111)

Master maritime navigation with this comprehensive guide to the International Regulations for Preventing Collisions at Sea. Learn about ship lights, day shapes, sound signals, and access the full COLREGs for safe sailing.

**Highlights:** Ship lights guide, Day shapes meanings, Sound signals library, Complete COLREGs access, Flashcards for study

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

**In-app purchases:** none


## Frequently asked questions

### Is Nautical Calculator Pro free?

Nautical Calculator Pro costs $8.99, with no in-app purchases.

### Is COLREG free?

COLREG costs $0.99, with no in-app purchases.

### Do Nautical Calculator Pro or COLREG have ads?

Neither Nautical Calculator Pro nor COLREG shows ads.

### Which is updated more often, Nautical Calculator Pro or COLREG?

Nautical Calculator Pro ships an update every 2 months, and COLREG every 7 months. Most recently, Nautical Calculator Pro was updated on September 17, 2026 and COLREG on September 15, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*