# 선생님이 말했다 vs 개념원리ai

The clearest difference is in-app purchases: 개념원리ai at none against 선생님이 말했다's 2. On price, update cadence, ads 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. 개념원리ai asks for nothing beyond the download.

선생님이 말했다 ships an update every 3 weeks, 개념원리ai fortnightly. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | 선생님이 말했다 | 개념원리ai |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.7 (6 ratings)](https://appshunter.io/ios/app/ai/id6467370741/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | — | 95.2% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | — | Free |
| Size | 103 MB | 145 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) | [(주)개념원리](https://appshunter.io/developer/1589346598) |

## 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 |


### 개념원리ai

[App page](https://appshunter.io/ios/app/ai/id6467370741)

This app combines a popular math textbook with AI to offer personalized learning. It provides free assessments with detailed explanations, allows users to create custom problem notes, and features a ranking system for friendly competition. Prepare for exams with AI-predicted questions and access a vast problem bank for all middle and high school levels.

**Highlights:** Personalized assessments with free detailed explanations, Customizable problem notes for focused review, AI-predicted exam questions based on school and curriculum, Extensive problem bank for all grades, Interactive ranking system and missions for motivation, Study groups and Q&A for collaborative learning

**In-app purchases:** none


## Frequently asked questions

### Is 선생님이 말했다 free?

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

### Is 개념원리ai free?

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

### Do 선생님이 말했다 or 개념원리ai have ads?

Neither 선생님이 말했다 nor 개념원리ai shows ads.

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

선생님이 말했다 ships an update every 3 weeks, and 개념원리ai fortnightly. Most recently, 선생님이 말했다 was updated on October 27, 2026 and 개념원리ai on October 30, 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.*