# Calculuz vs Koski

The clearest difference is in-app purchases: Koski at none against Calculuz's 7. Koski also leads on ads (none vs shown). Calculuz's advantage is iOS requirement (12.0 vs 15.0). On price and device support there is nothing between them.

Both are free to download. Calculuz sells 7 one-off in-app purchases. Koski asks for nothing beyond the download.

## The numbers

| Metric | Calculuz | Koski |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/calculuz-learning-math-game/id6443721522/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 days | — |
| Monetization | Free with in-app purchases | — |
| Size | 82 MB | 39 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bad Rhino ApS](https://appshunter.io/developer/1053234944) | [Intellectual Ideas OU](https://appshunter.io/developer/1696601579) |

## What reviewers say

### Calculuz

[App page](https://appshunter.io/ios/app/calculuz-learning-math-game/id6443721522)

A challenging math puzzle game where you fill in missing numbers in formulas. Progress through increasing difficulty levels, use power-ups, and compete for high scores. Tests arithmetic skills with timed challenges.

**Highlights:** Fill missing numbers in formulas, Progressive difficulty levels, Timed challenges, Power-ups available, Highscore lists for competition, Multiple formula collections

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 10 lifes | $0.99 | one-time |
| 25 lifes | $1.99 | one-time |
| 50 lifes | $2.99 | one-time |
| 100 lifes | $5.99 | one-time |
| 250 lifes | $9.99 | one-time |
| 500 lifes | $17.99 | one-time |
| 1000 lifes | $22.99 | one-time |


### Koski

[App page](https://appshunter.io/ios/app/koski/id6451457858)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calculuz free?

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

### Is Koski free?

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

### Do Calculuz or Koski have ads?

Calculuz shows ads; Koski does not.

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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.*