# COLREG vs Sextant Calculator

The clearest difference is review sentiment: Sextant Calculator at 100% against COLREG's 0%. COLREG's advantage is iOS requirement (12.0 vs 15.0). On price, update cadence, ads and in-app purchases there is nothing between them.

COLREG costs $0.99 and Sextant Calculator $1.00 up front. Neither carries in-app purchases, so what you see is what you pay.

COLREG ships an update every 7 months, Sextant Calculator every 8 months. The most recent releases landed on September 15, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | COLREG | Sextant Calculator |
| --- | --- | --- |
| Price | **$0.99** | $1.00 |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 8 months |
| Monetization | Paid | Paid |
| Size | 133 MB | 2 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Oleksandr Kuzmychov](https://appshunter.io/developer/1623095994) | [Will Downing](https://appshunter.io/developer/1864501052) |

## What reviewers say

### 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


### Sextant Calculator

[App page](https://appshunter.io/ios/app/sextant-calculator/id6757097850)

This tool simplifies celestial navigation calculations for sailors and students. It handles angle and time arithmetic, averages multiple sights, and features a specialized keypad. Offers day and night modes for usability at sea.

**Highlights:** Angle calculations in DD° MM.m', Time calculations with H:M:S, Average multiple sights, Custom color-coded keypad, Day and night modes, Scrollable results tape, Offline functionality

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

**In-app purchases:** none


## Frequently asked questions

### Is COLREG free?

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

### Is Sextant Calculator free?

Sextant Calculator costs $1.00, with no in-app purchases.

### Do COLREG or Sextant Calculator have ads?

Neither COLREG nor Sextant Calculator shows ads.

### Which is updated more often, COLREG or Sextant Calculator?

COLREG ships an update every 7 months, and Sextant Calculator every 8 months. Most recently, COLREG was updated on September 15, 2026 and Sextant Calculator on September 9, 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.*