# KOA 2023 vs 블루닥

The clearest difference is update cadence: KOA 2023 at daily against 블루닥's every 2 weeks. KOA 2023 also leads on iOS requirement (11.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

KOA 2023 ships an update daily, 블루닥 every 2 weeks. Both last shipped on October 7, 2026.

## The numbers

| Metric | KOA 2023 | 블루닥 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Daily** | Every 2 weeks |
| Size | 55 MB | 34 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [대한정형외과학회](https://appshunter.io/developer/1458330220) | [(주)블루엠텍](https://appshunter.io/developer/1598078675) |

## What reviewers say

### KOA 2023

[App page](https://appshunter.io/ios/app/koa-2023/id6467721314)

**Features:** macOS Compatibility

**In-app purchases:** none


### 블루닥

[App page](https://appshunter.io/ios/app/id6484506612)

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

**In-app purchases:** none


## Frequently asked questions

### Is KOA 2023 free?

KOA 2023 is free to download, with no in-app purchases.

### Is 블루닥 free?

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

### Do KOA 2023 or 블루닥 have ads?

Neither KOA 2023 nor 블루닥 shows ads.

### Which is updated more often, KOA 2023 or 블루닥?

KOA 2023 ships an update daily, and 블루닥 every 2 weeks. Most recently, KOA 2023 was updated on October 7, 2026 and 블루닥 on October 7, 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.*