# SK모바일ID vs Prefrontal Focus

The clearest difference is in-app purchases: SK모바일ID at none against Prefrontal Focus's 2. SK모바일ID also leads on iOS requirement (12.0 vs 17.0). Prefrontal Focus's advantage is update cadence (every 6 weeks vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. Prefrontal Focus sells 2 in-app purchases, starting at $9.99 per year. SK모바일ID asks for nothing beyond the download.

SK모바일ID ships an update every 4 months, Prefrontal Focus every 6 weeks. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | SK모바일ID | Prefrontal Focus |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 6 weeks** |
| Size | 54 MB | 2 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ADT CAPS Co.,LTD.](https://appshunter.io/developer/377876061) | [惜徐 彭](https://appshunter.io/developer/6797279414) |

## What reviewers say

### SK모바일ID

[App page](https://appshunter.io/ios/app/skid/id1554058229)

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

**In-app purchases:** none


### 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 SK모바일ID free?

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

### Is Prefrontal Focus free?

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

### Do SK모바일ID or Prefrontal Focus have ads?

Neither SK모바일ID nor Prefrontal Focus shows ads.

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

SK모바일ID ships an update every 4 months, and Prefrontal Focus every 6 weeks. Most recently, SK모바일ID was updated on October 29, 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.*