# 공부력 MONSTER vs Otus Game

The clearest difference is monetization model: Otus Game at free against 공부력 MONSTER's free with in-app purchases. 공부력 MONSTER's advantage is review sentiment (83% vs 67%). On price, update cadence, ads and in-app purchases there is nothing between them.

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

공부력 MONSTER ships an update monthly, Otus Game every 2 weeks. The most recent releases landed on September 19, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | 공부력 MONSTER | Otus Game |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **83.3% of reviews** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 2.0 GB | 174 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [VISANG EDUCATION INC](https://appshunter.io/developer/992780061) | [EDENLUX Corp.](https://appshunter.io/developer/1443712682) |

## What reviewers say

### 공부력 MONSTER

[App page](https://appshunter.io/ios/app/monster/id6444873429)

This educational game makes learning fun by letting users solve quizzes from popular study books. Earn in-game currency to unlock new maps and characters as you progress through English, Math, Korean, and Hanja challenges.

**Highlights:** Quiz-based learning, Monster battles, Map exploration, Character collection, Multi-subject practice (English, Math, Korean, Hanja), Social learning

**In-app purchases:** none


### Otus Game

[App page](https://appshunter.io/ios/app/otus-game/id6476952932)

Engage in a variety of games designed to improve eye health and vision. Requires membership and eye score measurement through a companion app to begin playing.

**Highlights:** Eye exercise games, Vision improvement focus, Requires Otus Plus membership, Eye score measurement integration, Suitable for tired eyes

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

**In-app purchases:** none


## Frequently asked questions

### Is 공부력 MONSTER free?

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

### Is Otus Game free?

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

### Do 공부력 MONSTER or Otus Game have ads?

Neither 공부력 MONSTER nor Otus Game shows ads.

### Which is updated more often, 공부력 MONSTER or Otus Game?

공부력 MONSTER ships an update monthly, and Otus Game every 2 weeks. Most recently, 공부력 MONSTER was updated on September 19, 2026 and Otus Game on September 16, 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.*