# 글씨21 vs Mental Math Games

The clearest difference is in-app purchases: 글씨21 at none against Mental Math Games's 2. 글씨21 also leads on iOS requirement (11.0 vs 16.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Mental Math Games sells 2 in-app purchases, starting at $1.99 per month. 글씨21 asks for nothing beyond the download.

글씨21 ships an update every 11 days, Mental Math Games weekly. The most recent releases landed on October 29, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | 글씨21 | Mental Math Games |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 days | **Weekly** |
| Size | 4 MB | 17 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [TAEJIN SEOK](https://appshunter.io/developer/1222953416) | [绍宝 叶](https://appshunter.io/developer/1840695283) |

## What reviewers say

### 글씨21

[App page](https://appshunter.io/ios/app/21/id1222953417)

**Features:** macOS Compatibility

**In-app purchases:** none


### Mental Math Games

[App page](https://appshunter.io/ios/app/mental-math-games-bopoom/id6819036226)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version Monthly | $1.99 | per month |
| Full Version | $9.99 | one-time |


## Frequently asked questions

### Is 글씨21 free?

글씨21 is free to download, with no in-app purchases.

### Is Mental Math Games free?

Mental Math Games is free to download, with in-app purchases available.

### Do 글씨21 or Mental Math Games have ads?

Neither 글씨21 nor Mental Math Games shows ads.

### Which is updated more often, 글씨21 or Mental Math Games?

글씨21 ships an update every 11 days, and Mental Math Games weekly. Most recently, 글씨21 was updated on October 29, 2026 and Mental Math Games on October 26, 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.*