# 킴아카 vs 자연과학OX

The clearest difference is in-app purchases: 킴아카 at none against 자연과학OX's 3. 킴아카 also leads on iOS requirement (11.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 자연과학OX sells 3 in-app purchases, starting at $2.99 per month. 킴아카 asks for nothing beyond the download.

킴아카 ships an update every 5 months, 자연과학OX every 4 months. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | 킴아카 | 자연과학OX |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 4 months** |
| Monetization | — | Freemium |
| Size | 27 MB | 26 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kyeong Seob Cheon](https://appshunter.io/developer/1064423696) | [CHAE HYUCK LEE](https://appshunter.io/developer/1658701307) |

## What reviewers say

### 킴아카

[App page](https://appshunter.io/ios/app/id1157393761)

**Features:** macOS Compatibility

**In-app purchases:** none


### 자연과학OX

[App page](https://appshunter.io/ios/app/ox/id6479007396)

This app offers practice quizzes for recent natural science topics, covering physics, chemistry, biology, and earth science. It provides subscription options for enhanced learning features and detailed explanations.

**Highlights:** Physics quizzes, Chemistry quizzes, Biology quizzes, Earth science quizzes, Subscription for explanations, Practice quizzes

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 단원 설정권 | $2.99 | per month |
| 무제한 해설권 | $3.99 | per month |
| 평생 자유 이용권 | $19.99 | one-time |


## Frequently asked questions

### Is 킴아카 free?

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

### Is 자연과학OX free?

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

### Do 킴아카 or 자연과학OX have ads?

Neither 킴아카 nor 자연과학OX shows ads.

### Which is updated more often, 킴아카 or 자연과학OX?

킴아카 ships an update every 5 months, and 자연과학OX every 4 months. Most recently, 킴아카 was updated on November 2, 2026 and 자연과학OX on November 4, 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.*