# Mentors (멘토스북) vs 챌릿

The clearest difference is review sentiment: 챌릿 at 100% against Mentors (멘토스북)'s 25%. 챌릿 also leads on update cadence (every 2 weeks vs every 13 months). Mentors (멘토스북)'s advantage is device support (3 vs 1) and iOS requirement (12.4 vs 16.4). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Mentors (멘토스북) ships an update every 13 months, 챌릿 every 2 weeks. The most recent releases landed on October 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Mentors (멘토스북) | 챌릿 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 25.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 2 weeks** |
| Monetization | Free | Free |
| Size | 4 MB | 115 MB |
| Requires iOS | **12.4** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Hong Suh](https://appshunter.io/developer/1325557308) | [BRITCENT Inc](https://appshunter.io/developer/1812836217) |

## What reviewers say

### Mentors (멘토스북)

[App page](https://appshunter.io/ios/app/mentors/id1325557309)

Access and download MP3 or video lectures from Mentors books for free. Features include repeat playback, speed control, and background listening to maximize learning effectiveness. Organize your personal study files in dedicated sections.

**Highlights:** Free MP3/video lecture access, Download lectures, Section repeat playback, Playback speed control, Background listening, Personal file organization

**Features:** macOS Compatibility

**In-app purchases:** none


### 챌릿

[App page](https://appshunter.io/ios/app/id6745542201)

Learn real-world English expressions used by native speakers through daily 3-question quizzes. Build a consistent learning habit with a visual calendar and earn in-app rewards for consistent practice.

**Highlights:** Daily 3-question quizzes, Learn native expressions, Continuous learning calendar, Earn in-app rewards (Scones), Quick signup with Kakao/Apple, Focus on practical usage over grammar

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mentors (멘토스북) free?

Mentors (멘토스북) is free to download, with no in-app purchases.

### Is 챌릿 free?

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

### Do Mentors (멘토스북) or 챌릿 have ads?

Neither Mentors (멘토스북) nor 챌릿 shows ads.

### Which is updated more often, Mentors (멘토스북) or 챌릿?

Mentors (멘토스북) ships an update every 13 months, and 챌릿 every 2 weeks. Most recently, Mentors (멘토스북) was updated on October 3, 2026 and 챌릿 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.*