Abacus Lesson

Name: Abacus Lesson
Rating: 4.8 (90 reviews)
Author: Hirokazu Komatsu

By: Hirokazu Komatsu

Change your life with abacus!

Features & Capabilities

Abacus Lesson is a Chrome extension that teaches abacus skills and rapid mental arithmetic, challenging you to solve problems in about 5 seconds. It offers ad-free lessons, portrait or landscape layouts, and freely movable abacus and window positions, plus training focused on finger movements and quick mental calculation to boost learning efficiency.

Lessons come from a highly-rated series and have been refined for clarity. New features include sound variations with adjustable volume, freely selectable colors, and a trophy reward for reaching goals, all optimized for smoother operation.

User Growth & Download Statistics

App Education Games

By:

Hirokazu Komatsu

Rating:

4.80

(90)

Version:

1.1.5 Last updated: 2023-09-10

Version code:

859802319

Creation date:

2021-12-19

Compatible devices:

Size:

152.72MB

URLs:

Website ,Privacy policy

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-06-04

Compare stats and ranking:

Ranking

# 153,571 ▼ 527

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.

Developed by:

Hirokazu Komatsu

Apple Apps Store

https://apps.apple.com/us/app/abacus-lesson/id1596053232

Website:

https://hirokuma.blog

User Reviews

Abacus Lesson is praised for being fun, engaging, and effective at teaching soroban basics through structured, progressive lessons. Users appreciate learning all core operations and the move from physical to mental math, with good value for the paid upgrade. Common downsides center on copy quality (typos and rough translation) and the need for clearer finger-movement guidance. Some also report purchasing/support friction, suggesting room for improved localization and customer support.

Pros

Fun, engaging learning experience that makes practicing abacus enjoyable.
Structured, progressive lessons that gradually build skills.
Clear instruction on correct soroban finger movements and transitioning to mental math.
Covers addition, subtraction, multiplication, and division comprehensively.
Good value; the paid upgrade is worth it.

Cons

Copy quality issues, including typos and rough, less clear translation.
Finger-technique instructions could be clearer with better visuals and guidance.

Recent reviews

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. ✋🏾

by Ma*****, 2026-01-20

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

by Al*****, 2025-10-09

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.