# 개념원리ai vs Chalcack

The clearest difference is rating: Chalcack at 5.0 against 개념원리ai's 4.2. Chalcack also leads on update cadence (every 2 days vs fortnightly). 개념원리ai's advantage is in-app purchases (none vs 3) and ads (none vs shown). On price, review sentiment, ratings volume and device support there is nothing between them.

Both are free to download. Chalcack sells 3 in-app purchases, starting at $9.99 per month. 개념원리ai asks for nothing beyond the download.

Chalcack holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 5 and 12 respectively. Written reviews point the same way: 95% of 개념원리ai's written reviews are positive against 97% of Chalcack's.

개념원리ai ships an update fortnightly, Chalcack every 2 days. The most recent releases landed on October 19, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | 개념원리ai | Chalcack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (5 ratings)](https://appshunter.io/ios/app/ai/id6467370741/reviews) | **[5.0 (12 ratings)](https://appshunter.io/ios/app/chalcack-your-study-crush/id6747833381/reviews)** |
| Number of ratings | 5 | **12** |
| Positive reviews | 95.1% of reviews | **97.2% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | **Every 2 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 153 MB | 49 MB |
| Requires iOS | **13.0** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [(주)개념원리](https://appshunter.io/developer/1589346598) | [Dong Hae Jang](https://appshunter.io/developer/1573538288) |

## 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


### Chalcack

[App page](https://appshunter.io/ios/app/chalcack-your-study-crush/id6747833381)

This AI-powered study companion helps students master difficult subjects by providing step-by-step solutions and explanations. It recognizes problems from photos and offers a personalized study vault for review. Get instant academic support anytime, anywhere.

**Highlights:** Snap and solve problems from photos, AI-powered step-by-step explanations, Support for Math, Science, English, and more, Master core concepts and principles, Personal study vault and review library, 24/7 AI academic assistance

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium subscription | $9.99 | per month |
| Yearly Pro (Special Offer) | $59.99 | per year |
| Yearly Premium subscription | $79.99 | per year |


## Frequently asked questions

### Is 개념원리ai free?

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

### Is Chalcack free?

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

### Which has better reviews, 개념원리ai or Chalcack?

Chalcack is rated higher. 개념원리ai averages 4.2 out of 5 from 5 ratings, while Chalcack averages 5.0 from 12 ratings.

### Do 개념원리ai or Chalcack have ads?

Chalcack shows ads; 개념원리ai does not.

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

개념원리ai ships an update fortnightly, and Chalcack every 2 days. Most recently, 개념원리ai was updated on October 19, 2026 and Chalcack on October 18, 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.*