# Mental Calculation & Abacus vs 공부력 MONSTER

The clearest difference is ads: 공부력 MONSTER at none against Mental Calculation & Abacus's shown. 공부력 MONSTER also leads on update cadence (monthly vs every 6 months). Mental Calculation & Abacus's advantage is review sentiment (100% vs 83%) and monetization model (ad-supported vs free with in-app purchases). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

Mental Calculation & Abacus ships an update every 6 months, 공부력 MONSTER monthly. Both last shipped on October 27, 2026.

## The numbers

| Metric | Mental Calculation & Abacus | 공부력 MONSTER |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/mental-calculation-and-abacus/id1582407909/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | **100.0% of reviews** | 83.3% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Monthly** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 143 MB | 2.0 GB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Park Jisang](https://appshunter.io/developer/995438886) | [VISANG EDUCATION INC](https://appshunter.io/developer/992780061) |

## What reviewers say

### Mental Calculation & Abacus

[App page](https://appshunter.io/ios/app/mental-calculation-and-abacus/id1582407909)

Engage in a fun and educational game designed to enhance mental calculation skills. Learn to use an abacus with an easy-to-follow tutorial and practice with diverse question types.

**Highlights:** Mental calculation practice, Abacus learning tutorial, Variety of practice questions, Suitable for all ages

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Mental Calculation & Abacus free?

Mental Calculation & Abacus is free to download, with no in-app purchases.

### Is 공부력 MONSTER free?

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

### Do Mental Calculation & Abacus or 공부력 MONSTER have ads?

Mental Calculation & Abacus shows ads; 공부력 MONSTER does not.

### Which is updated more often, Mental Calculation & Abacus or 공부력 MONSTER?

Mental Calculation & Abacus ships an update every 6 months, and 공부력 MONSTER monthly. Most recently, Mental Calculation & Abacus was updated on October 27, 2026 and 공부력 MONSTER on October 27, 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.*