# Abacus Lesson — Change your life with abacus!

> Learn abacus and mental arithmetic for rapid calculation. (iPhone/iPad app by Hirokazu Komatsu.)

- Source: https://appshunter.io/ios/app/abacus-lesson/id1596053232 (this page in markdown: same URL + `.md`)
- Developer: [Hirokazu Komatsu](https://appshunter.io/developer/1523833531)
- Category: Education, Utilities
- Price: Free with in-app purchases
- Rating: 4.80/5 from 94 App Store ratings · 40 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 153 MB
- Languages: American English, Japanese
- Released: 2021-12-19
- Data updated: 2026-08-27
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/abacus-lesson/id1596053232/reviews.md

## What is Abacus Lesson?

356+735+195, 23×89, 5626÷58, Can you solve each in 5 sec by mental arithmetic?
The goal of this app is to learn abacus and solve these problems in mental arithmetic within 5 seconds.
All lessons of the abacus lesson series, which have been highly evaluated all over the world, are recorded. The lessons have been reworked in a more polite and easy-to-understand.
In addition, we have added unique training methods such as training focusing on finger movements and mental arithmetic training to improve mental arithmetic in order to learn abacus more efficiently.
And various improvements have been made.
 - Either vertical screen or horizontal screen can be selected.
 - The position and size of the abacus and window can be freely laid out.
 - No ads.
 - Added sound variations. Volume control can also be finely set.
 - The color of the abacus can be set freely.
 - Earn a trophy by achieving the goal.
 - Smoother operability by optimizing the app.



◆Support web page
　https://hirokuma.blog/?p=4427

## Key features

- Abacus lessons
- Mental arithmetic training
- Finger movement focus
- Customizable abacus color
- Screen orientation options
- Trophy system for goals

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock all contents | $5.99 | one-time |


## Recent user reviews (10 of 40)

All indexed reviews: https://appshunter.io/ios/app/abacus-lesson/id1596053232/reviews.md

### 5/5 — すごくいいです

*2026-03-03*

ずっとやってみたかったそろばん、アプリで手軽にできるなんて最高です。(子供なら昇給とか段とか貰えればさらに良いだろうけど、大人は日常に活かせればそれで十分なので)1000円で全機能使えるならもちろん課金させていただきます。暗算できるようになりたい！

### 5/5 — Big hands

*2026-01-20*

Nice app. Fun learning, and practicing, and practice learning! Haven’t mastered the thumb-finger move on my small screen - but maybe I’ll conquer that with a physical abacus my size. ✋🏾

### 5/5 — 最高

*2025-10-21*

珠算塾以外のそろばんの勉強の方法を探してたところこのアプリが見つかりました。直感的な操作方法で使いやすいです。

### 5/5 — Great app to learn

*2025-10-09*

Already learned 1x3-4 multiplication good after about 2 hours

### 4/5 — Left-to-Right

*2025-08-17*

Thank you for this app. I would kindly request that you consider fixing the direction of calculation as some of the answer flows move the furthest right column before moving the column nearest to the left, thus calculating right to left instead of left to right. Otherwise please accept my gratitude for your work in helping people to learn this gift to maths around the world.

### 1/5 — 復元できない

*2025-07-20*

有料版を使用していましたが、突然無料版になり、復元もできなくなりました。分かりやすく説明がされており、とても気に入っていただけに残念です。

### 1/5 — Purchased the app but crashes when restoring

*2025-07-19*

I purchased the app, but after reinstalling it, I’m unable to restore my purchase. When I tap the “Restore Purchase” option, the app freezes, and I can’t access any of the features I’ve paid for.

I’ll update the review if it gets fixed.

### 1/5 — 過去に有料版を購入したのに…

*2025-07-19*

今日、突然未購入状態でクリアしたレベルもロック🔐状態になりました。アプリを再度インストールしても改善されません。至急、なんとかしてください。お願いします。

### 5/5 — 購入画面でフリーズします

*2025-07-18*

iPad Pro 12.9 M1ですが、復元画面でフリーズして購入できません。

### 5/5 — I love this app! I’ve learned so much

*2025-02-17*

I’m not one to write reviews but I can honestly say that this app is really good. I’ve learned so much from this app and it’s kind of fun learning abacus tbh. I enjoy this app and so will you!

## Frequently asked questions about Abacus Lesson

### What does the Abacus Lesson app do?

This app is designed to teach users how to use an abacus and improve their mental arithmetic skills. It offers lessons and unique training methods focused on finger movements and mental calculation to help users solve problems quickly.

### What are the key features of this app?

Key features include comprehensive abacus lessons, specialized mental arithmetic training, customizable abacus colors, adjustable screen layouts, sound variations, and a trophy system for achieving goals. The app is also ad-free and optimized for smooth operability.

### Is the Abacus Lesson app free to use?

The app is free to download and use, but it offers in-app purchases. This means you can access core features for free, with options to buy additional content or features.

### What devices is Abacus Lesson compatible with?

The app supports both vertical and horizontal screen orientations, suggesting compatibility with a wide range of mobile devices. Specific operating system requirements are not detailed but it is designed for mobile use.

### Who would benefit from using this app?

Anyone looking to enhance their mental calculation abilities, learn the abacus for faster arithmetic, or improve cognitive skills through brain training would benefit from this app. It's suitable for students and adults alike.

## Version history (last 5 releases)

### 1.1.5 — 2023-09-10

Updated IAP Library.
Fixed an issue that fail to verify receipts signed with sha-256

### 1.1.4 — 2023-09-09

Fixed minor bugs.

### 1.0.8 — 2022-01-17

Fixed minor bugs.
Improved operability of the abacus.

### 1.0.7 — 2022-01-17

Improved operability of the abacus

### 1.0.6 — 2022-01-04

Fixed Typo in setting menu.

## Apps similar to Abacus Lesson

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Soroban: Abacus & Mental Math](https://appshunter.io/ios/app/soroban-abacus-and-mental-math/id6743341778) | 4.5 (21) | Free | Education |
| [Soroban - Japanese Abacus](https://appshunter.io/ios/app/soroban-japanese-abacus/id6756285265) | — | Free | Education |
| [Abacus Mental Math Training](https://appshunter.io/ios/app/abacus-mental-math-training/id6449295111) | 4.1 (30) | Free | Education |
| [Flash Mental Math - Simple](https://appshunter.io/ios/app/flash-mental-math-simple/id1547944841) | 4.7 (18) | Free | Education |
| [Soroban Training](https://appshunter.io/ios/app/soroban-training/id1519658576) | 4.7 (176) | Free | Education |
| [Abacus Simulator](https://appshunter.io/ios/app/abacus-simulator/id1558355099) | 4.6 (31) | Free | Education |

## More apps by Hirokazu Komatsu

- [Abacus Exercise](https://appshunter.io/ios/app/abacus-exercise/id1523833529)
- [Camera Info](https://appshunter.io/ios/app/camera-info/id1524027808)
- [シンプル観察日記](https://appshunter.io/ios/app/id1524303935)
- [Abacus Lesson -ADD and SUB-](https://appshunter.io/ios/app/abacus-lesson-add-and-sub/id1526785916)
- [お弁当Master](https://appshunter.io/ios/app/master/id1538136139)
- [Abacus Lesson -Multiplication-](https://appshunter.io/ios/app/abacus-lesson-multiplication/id1582635868)

All apps by Hirokazu Komatsu: https://appshunter.io/developer/1523833531

## Related topics

[mental abacus](https://appshunter.io/ios/topics/mental-abacus) · [mental abacus book 2](https://appshunter.io/ios/topics/mental-abacus-book-2)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*