# 간단한글 vs Prefrontal Focus

The clearest difference is ads: Prefrontal Focus at none against 간단한글's shown. 간단한글's advantage is update cadence (every 4 days vs every 6 weeks) and iOS requirement (15.1 vs 17.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. 간단한글 sells 1 in-app purchase, starting at $0.49 per month and Prefrontal Focus sells 2 in-app purchases, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.

간단한글 ships an update every 4 days, Prefrontal Focus every 6 weeks. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 간단한글 | Prefrontal Focus |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Every 6 weeks |
| Size | 61 MB | 2 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SnapTool](https://appshunter.io/developer/1796068689) | [惜徐 彭](https://appshunter.io/developer/6797279414) |

## What reviewers say

### 간단한글

[App page](https://appshunter.io/ios/app/hwp-hwpx-pdf/id6765678460)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 간단한글 월간 프리미엄 | $0.49 | per month |


### Prefrontal Focus

[App page](https://appshunter.io/ios/app/prefrontal-focus-schulte/id6804123136)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Pro | $9.99 | per year |
| Lifetime Pro | $19.99 | one-time |


## Frequently asked questions

### Is 간단한글 free?

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

### Is Prefrontal Focus free?

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

### Do 간단한글 or Prefrontal Focus have ads?

간단한글 shows ads; Prefrontal Focus does not.

### Which is updated more often, 간단한글 or Prefrontal Focus?

간단한글 ships an update every 4 days, and Prefrontal Focus every 6 weeks. Most recently, 간단한글 was updated on October 28, 2026 and Prefrontal Focus on October 25, 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.*