# 선생님이 말했다 vs 자연과학OX

The clearest difference is update cadence: 선생님이 말했다 at every 3 weeks against 자연과학OX's every 4 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 선생님이 말했다 sells 2 in-app purchases, starting at $3.99 per month and 자연과학OX sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

선생님이 말했다 ships an update every 3 weeks, 자연과학OX every 4 months. The most recent releases landed on October 6, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | 선생님이 말했다 | 자연과학OX |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 4 months |
| Monetization | — | Freemium |
| Size | 103 MB | 26 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dinosband Inc](https://appshunter.io/developer/1576150337) | [CHAE HYUCK LEE](https://appshunter.io/developer/1658701307) |

## What reviewers say

### 선생님이 말했다

[App page](https://appshunter.io/ios/app/id1673233206)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 스탠다드 (월간) | $3.99 | per month |
| 프리미엄 (월간) | $6.99 | per month |


### 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 선생님이 말했다 free?

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

### Is 자연과학OX free?

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

### Do 선생님이 말했다 or 자연과학OX have ads?

Neither 선생님이 말했다 nor 자연과학OX shows ads.

### Which is updated more often, 선생님이 말했다 or 자연과학OX?

선생님이 말했다 ships an update every 3 weeks, and 자연과학OX every 4 months. Most recently, 선생님이 말했다 was updated on October 6, 2026 and 자연과학OX on October 5, 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.*