# 자연과학OX vs 읽어줘

The clearest difference is in-app purchases: 읽어줘 at none against 자연과학OX's 3. 읽어줘 also leads on update cadence (daily vs every 4 months). 자연과학OX's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

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

자연과학OX ships an update every 4 months, 읽어줘 daily. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 자연과학OX | 읽어줘 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Daily** |
| Monetization | Freemium | — |
| Size | 26 MB | 23 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CHAE HYUCK LEE](https://appshunter.io/developer/1658701307) | [HYUNWOO LEE](https://appshunter.io/developer/1592216709) |

## What reviewers say

### 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 |


### 읽어줘

[App page](https://appshunter.io/ios/app/id6813870874)

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

**In-app purchases:** none


## Frequently asked questions

### Is 자연과학OX free?

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

### Is 읽어줘 free?

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

### Do 자연과학OX or 읽어줘 have ads?

읽어줘 shows ads; 자연과학OX does not.

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

자연과학OX ships an update every 4 months, and 읽어줘 daily. Most recently, 자연과학OX was updated on November 4, 2026 and 읽어줘 on October 31, 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.*