# そろばん学習ドリル Ext vs RST MR Pro

The clearest difference is price: そろばん学習ドリル Ext at Free against RST MR Pro's $1.99. そろばん学習ドリル Ext also leads on iOS requirement (12.0 vs 15.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

そろばん学習ドリル Ext is free to download; RST MR Pro costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 5 months. The most recent releases landed on September 6, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | そろばん学習ドリル Ext | RST MR Pro |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | Every 5 months |
| Monetization | Free | — |
| Size | 24 MB | 5 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ryo itou](https://appshunter.io/developer/1435019729) | [koji kamogawa](https://appshunter.io/developer/1488210713) |

## What reviewers say

### そろばん学習ドリル Ext

[App page](https://appshunter.io/ios/app/ext/id1449114393)

This app offers four courses to help beginners learn abacus calculation. It includes exercises for placing numbers, simple addition, addition of ten numbers, and auditory addition. Progress is tracked, and difficulty increases with proficiency.

**Highlights:** Placing numbers on the abacus, Two-digit addition practice, Addition of ten numbers, Auditory addition exercises, Progress tracking, Adaptive difficulty levels

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

**In-app purchases:** none


### RST MR Pro

[App page](https://appshunter.io/ios/app/rst-mr-pro/id1565478142)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is そろばん学習ドリル Ext free?

そろばん学習ドリル Ext is free to download, with no in-app purchases.

### Is RST MR Pro free?

RST MR Pro costs $1.99, with no in-app purchases.

### Do そろばん学習ドリル Ext or RST MR Pro have ads?

Neither そろばん学習ドリル Ext nor RST MR Pro shows ads.

### Which is updated more often, そろばん学習ドリル Ext or RST MR Pro?

そろばん学習ドリル Ext ships an update every 5 months, and RST MR Pro every 5 months. Most recently, そろばん学習ドリル Ext was updated on September 6, 2026 and RST MR Pro on September 13, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*