# Kluchi vs Calcudoku

The clearest difference is in-app purchases: Calcudoku at none against Kluchi's 1. Kluchi's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 2 months). On price, rating, ratings volume and device support there is nothing between them.

Both are free to download. Kluchi sells 1 one-off in-app purchase. Calcudoku asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Kluchi against 5.0 for Calcudoku. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

Kluchi ships an update every 3 weeks, Calcudoku every 2 months. The most recent releases landed on October 6, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Kluchi | Calcudoku |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/kluchi/id1182879708/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/calcudoku-math-logic-puzzles/id6772270032/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 5 MB | 104 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Maxim Polous](https://appshunter.io/developer/560072891) | [LogicSmith](https://appshunter.io/developer/6772270034) |

## What reviewers say

### Kluchi

[App page](https://appshunter.io/ios/app/kluchi/id1182879708)

This puzzle game challenges players to strategically place all keys onto a table. Utilize unique key connectors and special "neighbors" mechanics to solve increasingly complex arrangements. Hints are available to assist when you get stuck.

**Highlights:** Key placement puzzle, Unique connector mechanics, Special 'neighbors' keys, Hint system, Brain training benefits, New puzzle type

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 9 hints | $0.99 | one-time |


### Calcudoku

[App page](https://appshunter.io/ios/app/calcudoku-math-logic-puzzles/id6772270032)

This logic puzzle game offers a unique approach to learning how to solve number grids. Instead of simply revealing answers, it provides intelligent, step-by-step guidance on logical strategies and note-taking to help you master the puzzles.

**Highlights:** Intelligent step-by-step explanations, Optional auto notes for cages, Intuitive note-taking interface, Variety of arithmetic operations, Grids for all skill levels, Offline-first architecture, Dark mode support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Kluchi free?

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

### Is Calcudoku free?

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

### Which has better reviews, Kluchi or Calcudoku?

Kluchi and Calcudoku are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do Kluchi or Calcudoku have ads?

Calcudoku shows ads; Kluchi does not.

### Which is updated more often, Kluchi or Calcudoku?

Kluchi ships an update every 3 weeks, and Calcudoku every 2 months. Most recently, Kluchi was updated on October 6, 2026 and Calcudoku on October 3, 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.*