# Четыре краски vs Physics Zen

The clearest difference is in-app purchases: Четыре краски at none against Physics Zen's 6. Четыре краски also leads on iOS requirement (8.0 vs 16.4). Physics Zen's advantage is update cadence (every 2 days vs every 59 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Physics Zen sells 6 in-app purchases, starting at $3.99 per 7 days. Четыре краски asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Четыре краски against 5.0 for Physics Zen. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Четыре краски ships an update every 59 months, Physics Zen every 2 days. The most recent releases landed on October 8, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Четыре краски | Physics Zen |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/id644228154/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/physics-zen-learn-and-practice/id6808595963/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 92.9% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 59 months | **Every 2 days** |
| Monetization | Free | — |
| Size | 11 MB | 84 MB |
| Requires iOS | **8.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Roman Koksharov](https://appshunter.io/developer/700716922) | [Ivan Terekhin](https://appshunter.io/developer/888645337) |

## What reviewers say

### Четыре краски

[App page](https://appshunter.io/ios/app/id644228154)

Explore the Four Color Theorem by coloring a map of Russia. Learn geography and discover the first computer-proven scientific statement. This app offers an interactive way to understand a complex mathematical concept.

**Highlights:** Interactive map coloring, Demonstrates Four Color Theorem, Geography learning, Historical math context, Country map exploration

**Features:** macOS Compatibility

**In-app purchases:** none


### Physics Zen

[App page](https://appshunter.io/ios/app/physics-zen-learn-and-practice/id6808595963)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support, iPhone Duo support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Physics Zen Weekly | $3.99 | per 7 days |
| Physics Zen Monthly | $6.99 | per month |
| Physics Zen Annual | $29.99 | per year |
| Physics Zen Lifetime | $24.99 | one-time |
| Physics Zen Lifetime | $29.99 | one-time |
| Physics Zen Lifetime | $39.99 | one-time |


## Frequently asked questions

### Is Четыре краски free?

Четыре краски is free to download, with no in-app purchases.

### Is Physics Zen free?

Physics Zen is free to download, with in-app purchases available.

### Which has better reviews, Четыре краски or Physics Zen?

Четыре краски and Physics Zen are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Четыре краски or Physics Zen have ads?

Neither Четыре краски nor Physics Zen shows ads.

### Which is updated more often, Четыре краски or Physics Zen?

Четыре краски ships an update every 59 months, and Physics Zen every 2 days. Most recently, Четыре краски was updated on October 8, 2026 and Physics Zen on October 29, 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.*