# Abacus Lesson — user reviews

> 40 indexed App Store user reviews of Abacus Lesson by Hirokazu Komatsu, rated 4.80/5 from 94 ratings.

- Source: https://appshunter.io/ios/app/abacus-lesson/id1596053232/reviews
- App overview in markdown: https://appshunter.io/ios/app/abacus-lesson/id1596053232.md
- Rating breakdown: 5★ 82 · 4★ 8 · 3★ 2 · 2★ 0 · 1★ 2

## Newest reviews (13 of 40)

### 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.

### 4/5 — Yes u need to watch you utube

*2024-11-12*

To pick u the correct thumb and index finger motions. You still need to watch YouTube.

### 5/5 — 初心者でもわかりやすく900円出して良かったと思えるアプリ！

*2024-03-20*

月額じゃなく買い切りと言うのが非常に良かったです！
計算が苦手な人こそやって損はなしだと思います🌸
開発者さん良いアプリをありがとうございます😭

### 5/5 — Real life training

*2024-01-20*

I was so impressed with this app that I purchased it. I love practicing using the abacus and this app really delivers excellent training. They explained the friends concept with small and large compliments and cover addition, subtraction, multiplication, and division.  Correct finger movements are taught as well and it teaches you how to transition from a physical abacus to using mental math - calculating all the math in your head. This is something that should be taught from a young age. Just like reading, math can be learned as soon as they start speaking and earlier.

I have no complaints.

### 5/5 — Embarrassment no more

*2023-12-25*

I always imagined that Abacus was simply a mechanical calculator. I have learned it is much more. I have always struggled with mental arithmetic and was surprised at the insights into arithmetical operations the app has provided. The Abacus develops mental arithmetic ability. I am very much enjoying using the app and developing this important skill.

### 5/5 — Just what I was looking for!

*2023-10-25*

This has been a great tool already with just a couple of days. I’m using this for foundational learning as well as practice but I don’t always have my soroban with me. I do think there are some typos that make it sometimes a hair confusing (top/upper number) I’m pretty sure means leftmost number. I’d love to help clean up some typos if you guys are interested! It would be an awesome way for me to learn as well since I’d probably be reading most of the copy used in this app. Anyways thanks for the app and I’ll continue learning! Looking forward to mastering this skill and improving my brain game!

Apparently I never hit send but I have some additions anyway! Still love this app but when I’m practicing, the layout has a black bar that grows with the soroban. I’d rather that black bar be on top because I keep pulling the Notification Center down instead of pulling down the 5 bead. Please remove the black bar or move it up too where it will actually be more of a feature than a hinderance lol.

### 5/5 — Just what I was looking for!

*2023-10-12*

This has been a great tool already with just a couple of days. I’m using this for foundational learning as well as practice but I don’t always have my soroban with me. I do think there are some typos that make it sometimes a hair confusing (top/upper number) I’m pretty sure means leftmost number. I’d love to help clean up some typos if you guys are interested! It would be an awesome way for me to learn as well since I’d probably be reading most of the copy used in this app. Anyways thanks for the app and I’ll continue learning! Looking forward to mastering this skill and improving my brain game!

### 4/5 — 外出先でも制限なく使いたい

*2023-09-22*

ソロバンを習い始めた小学低学年の娘に使わせたところ、夢中になって使っており、教室の復習や先取り学習にも役立っています。とても優れたアプリです。一つ残念なことに、有料版はWifiなどない外出先では使えないというところですね。

### 5/5 — Learn it right

*2023-09-21*

If you want to learn to use a soroban, you can get an app.  If you want to learn to use it RIGHT, get this one.  It teaches how practicing the  CORRECT motions is the key to success.  Unlike other apps, it also teaches multiplication and division.

### 5/5 — 購入したのに未購入

*2023-09-10*

せっかく気に入って、￥900で購入したのに、未購入と表示され、レベルの解除も出来ない。
これじゃあ、詐欺じゃないですか？

**Developer response:** この度は大変ご迷惑をおかけしております。バージョン1.1.5にて購入関連のバグを修正しております。そちらでアプリを起動しもう一度試していただけますでしょうか？また、それでもうまくいかないようでしたら、アプリをアンインストールし、復元することで購入履歴が反映され、ご利用いただけるかと思います。お手数をおかけしてしまいまことに恐縮ですが、どうぞ、よろしくお願いいたします。

### 5/5 — THANK U!!!

*2023-09-04*

this app has actually helped me. TYSM!

### 5/5 — 32歳、人生初のそろばん

*2023-08-25*

人生の基礎力がアップできそう！

### 5/5 — Amazing app

*2023-08-04*

Congrats to the develops, lessons super easy to follow and the progression of the learning 
My cognitive therapist told me to learn something new and I chose this.
And the price is more than worth it! 
Thank you for

## Most critical reviews (10 lowest-rated)

### 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。

### 1/5 — アプリが開けない

*2022-12-22*

iPhone13 mini

ios 16.2

開けない

### 2/5 — 固まります

*2022-05-06*

足し算引き算と、かけ算と、割り算とこのシリーズの三つのアプリをダウンロードさせていただきましたが、こちらのアプリは固まってしまってプレイできませんでした。苦笑。
iPhone7です。
機種のせい？

**Developer response:** 貴重なご意見ありがとうございました。なるべく多くの方に利用していただけるよう、できるだけ多くのOSバージョンに対応できる設定としておりますが、全ての機種で評価はしきれていないため、機種によってはご不便をおかけすることを大変申し訳なく思います。レッスンの序盤は無料でご利用いただけますので、まずは動きを試してみてご購入を判断いただければと思います。

### 3/5 — I love this course BUT…..

*2025-02-12*

Lessons 1-6 are simple steps adding one complication at a time.  Lesson 7 is a big jump going from 1 digit to two digit addition and subtraction. Adding 10’s complement work to the already practiced 5’s complement work and then expecting a neophyte to keep track of both at the same time.  And on top of that making the problems multi step involving 5 transactions at once.  Successfully completing lesson 6 does not prepare one for lesson 7.  I think lesson 7 should be broken into at least 3 separate lessons.  Additionally, waiting until one has done 5 problems before finding out if one is correct is not helpful.  I would learn faster if I knew the quality of my work immediately so I could immediately repeat the work and find my problem.  Being able to repeat the same problem repeatedly would increase the speed at which I could learn the patterns.

### 3/5 — I love this course BUT…..

*2025-02-08*

Lessons 1-6 are simple steps adding one complication at a time.  Lesson 7 is a big jump going from 1 digit to two digit addition and subtraction. Adding 10’s complement work to the already practiced 5’s complement work and then expecting a neophyte to keep track of both at the same time.  And on top of that making the problems multi step involving 5 transactions at once.  Successfully completing lesson 6 does not prepare one for lesson 7.  I think lesson 7 should be broken into at least 3 separate lessons.

### 3/5 — English translation needs work

*2025-01-23*

The practices build on each other nicely, but this was clearly not written in English originally. The translation is rough, almost to the point of unusability: I would only recommend it to people who are comfortable with math already, or who will have someone with them that is comfortable and can figure out the meaning (if you already know the destination, it makes it easier to decipher unclear directions). The timed practices could also use a reset button - if you lose your place you’re not getting back to the starting conditions on your own and you just have to scrap the whole thing

### 3/5 — Update suggestion

*2024-02-05, version 1.1.5*

Nice app, but it would be great if you could tap the bead to move instead of sliding it, it’s inconvenient on the phone than a physical abacus. PS if you do I’ll recommend to friends

### 3/5 — 暗算トレーニングのデモ動画

*2023-06-11*

購入を考えています。暗算トレーニングのデモ動画がお試しアプリにないので、商品説明ページでデモ動画をアップして欲しいです。

## Most praised reviews (10 highest-rated)

### 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

### 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!

### 5/5 — Great app-some critiques

*2025-01-27*

First off, great app. It’s easy, direct, and the price isn’t ridiculous.

If I could suggest, I would ask for the finger movements section to be a bit clearer. If you need someone who speaks English I would get a translator and more visuals of what the fingers do.

I’d also like if addition and subtraction were in separate categories. I feel I learned addition but not subtraction then was stumped on some subtraction movements.

### 5/5 — おっさん

*2024-09-29*

でも面白く、且つわかりやすく学べます！

### 5/5 — 興味

*2024-08-12*

暗算に興味があり、このアプリを試したところ使い勝手が良く熱中しています。

### 5/5 — Amazing for learning!

*2024-03-31*

this is a great app for learning the abacus, it clearly states how to use it and has tons of free practise exercises. The feedback I have is I wish it enforced correct finger movements more, otherwise its great.

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*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 2026-09-01.*