# 개념원리ai vs 루잉

The clearest difference is in-app purchases: 개념원리ai at none against 루잉's 2. 개념원리ai also leads on update cadence (fortnightly vs every 2 months) and iOS requirement (13.0 vs 15.1). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. 루잉 sells 2 in-app purchases, starting at $7.99 per month. 개념원리ai asks for nothing beyond the download.

개념원리ai ships an update fortnightly, 루잉 every 2 months. The most recent releases landed on October 15, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | 개념원리ai | 루잉 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (5 ratings)](https://appshunter.io/ios/app/ai/id6467370741/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 95.1% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | **Free** | Freemium |
| Size | 153 MB | 19 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [(주)개념원리](https://appshunter.io/developer/1589346598) | [(주)스낵잉글리시](https://appshunter.io/developer/1570273709) |

## What reviewers say

### 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


### 루잉

[App page](https://appshunter.io/ios/app/3/id6755586584)

Learn English conversation through 3-minute daily video routines featuring native speakers. Master real-life expressions and build a consistent study habit with bite-sized content.

**Highlights:** 3-minute daily English conversation routines, Native speaker vlog content, Real-life expressions and nuances, Full English/Korean subtitles, Vocabulary and example sentences, Progress tracking and review

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscribe | $7.99 | per month |
| 연간 구독 | $59.99 | per year |


## Frequently asked questions

### Is 개념원리ai free?

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

### Is 루잉 free?

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

### Do 개념원리ai or 루잉 have ads?

Neither 개념원리ai nor 루잉 shows ads.

### Which is updated more often, 개념원리ai or 루잉?

개념원리ai ships an update fortnightly, and 루잉 every 2 months. Most recently, 개념원리ai was updated on October 15, 2026 and 루잉 on September 19, 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.*