# SoroTouch Mental Calculation vs 九九 掛け算の達人 !

The clearest difference is rating: 九九 掛け算の達人 ! at 4.9 against SoroTouch Mental Calculation's 2.3. 九九 掛け算の達人 ! also leads on monetization model (ad-supported vs subscription) and device support (3 vs 1). SoroTouch Mental Calculation's advantage is ads (none vs shown) and ratings volume (39 vs 7). On price, update cadence 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.

九九 掛け算の達人 ! holds the better App Store score, 4.9 against 2.3. That said, the two scores are not equally well evidenced: SoroTouch Mental Calculation has 39 ratings behind it against 7, so its average is the more settled of the two.

SoroTouch Mental Calculation ships an update every 2 months, 九九 掛け算の達人 ! monthly. The most recent releases landed on September 24, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | SoroTouch Mental Calculation | 九九 掛け算の達人 ! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (39 ratings)](https://appshunter.io/ios/app/sorotouch-mental-calculation/id1153930190/reviews) | **[4.9 (7 ratings)](https://appshunter.io/ios/app/2/id1628035452/reviews)** |
| Number of ratings | **39** | 7 |
| Positive reviews | 32.1% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Subscription | **Ad-supported** |
| Size | 460 MB | 155 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SoroTouch Co., Ltd.](https://appshunter.io/developer/927820962) | [Ohmori Takeru](https://appshunter.io/developer/969791681) |

## What reviewers say

### SoroTouch Mental Calculation

[App page](https://appshunter.io/ios/app/sorotouch-mental-calculation/id1153930190)

This app teaches abacus method mental calculation using patented imaging technology. Designed for children aged 5-8, it offers games and rankings to enhance math skills through daily practice. It requires membership registration via a web portal.

**Highlights:** Abacus method mental calculation, Imaging skills training, Daily missions and games, Progress tracking and rankings, Visible and Invisible modes, Audio and rhythm-based learning

**In-app purchases:** none


### 九九 掛け算の達人 !

[App page](https://appshunter.io/ios/app/2/id1628035452)

This educational game helps children master multiplication tables. It offers a fun way to practice essential math skills for second graders.

**Highlights:** Multiplication study, Math game, Suitable for second graders, Practice 99 multiplication tables

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

**In-app purchases:** none


## Frequently asked questions

### Is SoroTouch Mental Calculation free?

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

### Is 九九 掛け算の達人 ! free?

九九 掛け算の達人 ! is free to download, with no in-app purchases.

### Which has better reviews, SoroTouch Mental Calculation or 九九 掛け算の達人 !?

九九 掛け算の達人 ! is rated higher. SoroTouch Mental Calculation averages 2.3 out of 5 from 39 ratings, while 九九 掛け算の達人 ! averages 4.9 from 7 ratings.

### Do SoroTouch Mental Calculation or 九九 掛け算の達人 ! have ads?

九九 掛け算の達人 ! shows ads; SoroTouch Mental Calculation does not.

### Which is updated more often, SoroTouch Mental Calculation or 九九 掛け算の達人 !?

SoroTouch Mental Calculation ships an update every 2 months, and 九九 掛け算の達人 ! monthly. Most recently, SoroTouch Mental Calculation was updated on September 24, 2026 and 九九 掛け算の達人 ! on September 6, 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.*