# Арифметические ребусы vs KPD

The clearest difference is review sentiment: Арифметические ребусы at 100% against KPD's 22%. Арифметические ребусы also leads on iOS requirement (8.0 vs 16.0). KPD's advantage is update cadence (every 5 months vs every 30 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Арифметические ребусы ships an update every 30 months, KPD every 5 months. The most recent releases landed on October 23, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Арифметические ребусы | KPD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/id609753150/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | **100.0% of reviews** | 22.2% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 30 months | **Every 5 months** |
| Monetization | Free | Free |
| Size | 4 MB | 10 MB |
| Requires iOS | **8.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Roman Koksharov](https://appshunter.io/developer/700716922) | [НОУ МЦНМО](https://appshunter.io/developer/1235476259) |

## What reviewers say

### Арифметические ребусы

[App page](https://appshunter.io/ios/app/id609753150)

Solve arithmetic puzzles by replacing letters with numbers to form correct equations. This game challenges your logical thinking and addition skills with clever and sometimes difficult puzzles.

**Highlights:** Solve arithmetic puzzles, Replace letters with numbers, Logical thinking challenges, Addition skill development, Clever puzzle formulations

**Features:** macOS Compatibility

**In-app purchases:** none


### KPD

[App page](https://appshunter.io/ios/app/kpd-bio/id1229570219)

This app provides a comprehensive Russian-language electronic version of a leading biology textbook, ideal for high school students and teachers. It includes supplementary materials for practice and scientific article analysis, offering structured learning from basic to advanced concepts.

**Highlights:** Russian electronic textbook, Student Study Guide included, Inquiry in Action guide, University-level biology content, Illustrations and diagrams, Self-check questions and tasks, Electronic glossary search

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Арифметические ребусы free?

Арифметические ребусы is free to download, with no in-app purchases.

### Is KPD free?

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

### Do Арифметические ребусы or KPD have ads?

Neither Арифметические ребусы nor KPD shows ads.

### Which is updated more often, Арифметические ребусы or KPD?

Арифметические ребусы ships an update every 30 months, and KPD every 5 months. Most recently, Арифметические ребусы was updated on October 23, 2026 and KPD on October 21, 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.*