# MentalCalculation & Abacus Pro vs 던가드

The clearest difference is review sentiment: 던가드 at 40% against MentalCalculation & Abacus Pro's 0%. 던가드 also leads on ads (none vs shown) and update cadence (every 4 days vs monthly). MentalCalculation & Abacus Pro's advantage is in-app purchases (none vs 10) and price ($0.99 vs $1.99). On device support and iOS requirement there is nothing between them.

MentalCalculation & Abacus Pro costs $0.99 and 던가드 $1.99 up front. 던가드 sells 10 one-off in-app purchases. MentalCalculation & Abacus Pro asks for nothing beyond the download.

MentalCalculation & Abacus Pro ships an update monthly, 던가드 every 4 days. Both last shipped on October 23, 2026.

## The numbers

| Metric | MentalCalculation & Abacus Pro | 던가드 |
| --- | --- | --- |
| Price | **$0.99** | $1.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/id6477193545/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 0.0% of reviews | **40.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 4 days** |
| Monetization | Paid | — |
| Size | 144 MB | 215 MB |
| 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) | [Jeong Mo Lee](https://appshunter.io/developer/1728684282) |

## What reviewers say

### MentalCalculation & Abacus Pro

[App page](https://appshunter.io/ios/app/mentalcalculation-and-abacus-pro/id6474296462)

Engage in a fun and challenging mental calculation and abacus game. Practice with diverse questions and learn the abacus with an easy tutorial. This pro version offers an enhanced experience without frequent forced ads.

**Highlights:** Mental calculation practice, Abacus learning tutorial, Variety of practice questions, Pro version benefits, No forced ads

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

**In-app purchases:** none


### 던가드

[App page](https://appshunter.io/ios/app/id6477193545)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1200주얼 | $0.49 | one-time |
| 류 구매 | $1.99 | one-time |
| 레스로나 구매 | $1.99 | one-time |
| 시우 구매 | $1.99 | one-time |
| 4000주얼 | $1.99 | one-time |
| 종료보상 3배 | $5.99 | one-time |
| 골드 2배 | $5.99 | one-time |
| 15000주얼 | $5.99 | one-time |
| 30000주얼 | $12.99 | one-time |
| 70000주얼 | $34.99 | one-time |


## Frequently asked questions

### Is MentalCalculation & Abacus Pro free?

MentalCalculation & Abacus Pro costs $0.99, with no in-app purchases.

### Is 던가드 free?

던가드 costs $1.99, and also offers in-app purchases.

### Do MentalCalculation & Abacus Pro or 던가드 have ads?

MentalCalculation & Abacus Pro shows ads; 던가드 does not.

### Which is updated more often, MentalCalculation & Abacus Pro or 던가드?

MentalCalculation & Abacus Pro ships an update monthly, and 던가드 every 4 days. Most recently, MentalCalculation & Abacus Pro was updated on October 23, 2026 and 던가드 on October 23, 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.*