# CatStack! vs K

The clearest difference is in-app purchases: CatStack! at none against K's 1. CatStack! also leads on ads (none vs shown). K's advantage is iOS requirement (15.0 vs 18.5). On price and device support there is nothing between them.

Both are free to download. K sells 1 one-off in-app purchase. CatStack! asks for nothing beyond the download.

## The numbers

| Metric | CatStack! | K |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/k-mahjong/id6761087551/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Every 2 days |
| Monetization | — | Free with in-app purchases |
| Size | 42 MB | 42 MB |
| Requires iOS | 18.5 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TAKURO INOUE](https://appshunter.io/developer/1806841917) | [Jiwon Lee](https://appshunter.io/developer/1829564786) |

## What reviewers say

### CatStack!

[App page](https://appshunter.io/ios/app/catstack/id6747741193)

**Features:** macOS Compatibility

**In-app purchases:** none


### K

[App page](https://appshunter.io/ios/app/k-mahjong/id6761087551)

A relaxing block-matching puzzle game inspired by the visual charm of Hangul. Match identical tiles to clear the board, offering a calming experience with a unique cultural twist. Discover Korean words and meanings while you play.

**Highlights:** Hangul-themed block matching, Relaxing mahjong-style gameplay, Simple 2-tile matching, Unlimited levels, Helpful in-game items, Multilingual support, Korean word discovery

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| K-Mahjong Premium | $19.99 | one-time |


## Frequently asked questions

### Is CatStack! free?

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

### Is K free?

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

### Do CatStack! or K have ads?

K shows ads; CatStack! 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.*