# Four Colours

> Educational app demonstrating the four-color theorem with interactive maps. (iPhone/iPad app by Roman Koksharov.)

- Source: https://appshunter.io/ios/app/four-colours/id644215345 (this page in markdown: same URL + `.md`)
- Developer: [Roman Koksharov](https://appshunter.io/developer/700716922)
- Category: Education, Games, Puzzle
- Price: $1.99
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 12.0 · 15 MB
- Languages: American English, Russian
- Released: 2013-05-09
- Data updated: 2026-06-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/four-colours/id644215345/reviews.md

## What is Four Colours?

Could be a map of USA or your country colored using four colors in such a way that Nebraska and Missouri (as well as any two contiguous regions or states) wouldn’t be filled with one color? It turns out that you can manage to do it with any map. And this seems to be the first statement in science proved with computer aid. You can verify this statement for variety of maps, study up geography and visit Martin Gardner country by the way.

Maps in this release:
• Commonwealth of Australia,
• Republic of Austria,
• French Republic,
• Federal Republic of Germany,
• United Mexican States,
• Republic of Poland,
• Portuguese Republic,
• Kingdom of Spain,
• Kingdom of Sweden,
• Swiss Confederation,
• United States of America,
• United Kingdom of Great Britain and Northern Ireland.

## Key features

- Four-color theorem demonstration
- Interactive maps of 12 countries/regions
- Geography study tool
- Computer-aided science verification
- Educational exploration


## Frequently asked questions about Four Colours

### What is Four Colours about?

Four Colours demonstrates the four-color theorem, a mathematical concept proving that any map can be colored using only four colors such that no two adjacent regions share the same color. It allows users to explore this concept with various country maps.

### What maps are included in Four Colours?

Four Colours includes interactive maps for the Commonwealth of Australia, Republic of Austria, French Republic, Federal Republic of Germany, United Mexican States, Republic of Poland, Portuguese Republic, Kingdom of Spain, Kingdom of Sweden, Swiss Confederation, United States of America, and United Kingdom of Great Britain and Northern Ireland.

### How much does Four Colours cost?

Four Colours is a paid app, priced at $1.99. This one-time purchase grants you access to all its features and content.

### What devices support Four Colours?

Four Colours is supported on iPhone, iPad, and iPod devices. It is designed to run on Apple's mobile operating system.

### What is the age rating for Four Colours?

Four Colours has an age rating of 4+, making it suitable for young children and up. The content is generally considered safe and educational for this age group.

### How often is Four Colours updated?

The latest version of Four Colours is 1.1.2, last updated on October 28, 2024. This indicates the app is actively maintained by the developer.

### Does Four Colours have ads?

No, Four Colours does not contain advertisements. As a paid application, it offers an ad-free experience for users.

### What is the user feedback on Four Colours?

Based on the available data, Four Colours has a perfect rating of 5.0 stars from one review. This suggests a highly positive initial user experience.

## Version history (last 4 releases)

### 1.1.2 — 2024-10-28

This update adds support for iOS 18.

### 1.1.1 — 2021-05-05

— This update adds support for iOS 14.

### 1.1 — 2018-03-03

This app has been updated by Apple to display the Apple Watch app icon.

— This update adds support for iOS 11 and iPhone X.

### 1.0 — 2013-05-08

No release notes.

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## More apps by Roman Koksharov

- [Pythagoras](https://appshunter.io/ios/app/pythagoras/id404430950)
- [Pythagoras HD](https://appshunter.io/ios/app/pythagoras-hd/id404432708)
- [В уме](https://appshunter.io/ios/app/id482487701)
- [Cryptarithms](https://appshunter.io/ios/app/cryptarithms/id609736978)
- [Арифметические ребусы](https://appshunter.io/ios/app/id609753150)

All apps by Roman Koksharov: https://appshunter.io/developer/700716922

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-24.*