Abacus Lesson -ADD and SUB-

Name: Abacus Lesson -ADD and SUB-
Rating: 4.9 (767 reviews)
Author: Hirokazu Komatsu

By: Hirokazu Komatsu App

ADD and SUB using Abacus

Overview

Version:

3.1.9

Last updated: 2024-01-16

Ranking

#64,725 ▼ 47

Overall

Features & Capabilities

Abacus Lesson -ADD and SUB- teaches addition and subtraction using a traditional abacus. The abacus, called Soroban in Japan, is a simple calculator used in many Asian countries. The app demonstrates how moving beads can form the basis for mental math, reinforcing the idea that you can solve calculations in your head rather than relying on a digital calculator.

The aim is to help you perform roughly three-digit calculations without physical tools and to develop the skill of calculation. This Chrome extension provides a clear, concept-driven way to learn addition and subtraction through the abacus.

User Growth & Download Statistics

App Education

By:

Hirokazu Komatsu

Rating:

4.90

(767) 2 new ratings

Version:

3.1.9 Last updated: 2024-01-16

Version code:

862940310

Creation date:

2020-08-09

Compatible devices:

Size:

137.78MB

URLs:

Website ,Privacy policy

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-07-19

Compare stats and ranking:

Ranking

# 64,725 ▼ 47

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-add-and-sub/id1526785916

Website:

https://hirokuma.blog

User Reviews

Reviewers praise the app for being ad-free, beginner-friendly, and easy-to-understand with helpful explanations and practical exercises. However, readability and translation quality, pacing of lessons, and some mobile UI quirks (especially on iPhone) detract from the experience. Overall, it's a solid starting point for learning abacus with room for text quality, pacing improvements, and improved mobile usability.

Pros

Ad-free or very few ads and free to use
Beginner-friendly and easy to learn
Explanations are clear, helpful, and easier to grasp than many video tutorials
Fun and engaging to practice abacus concepts
Straightforward practice that reinforces basics and builds understanding

Cons

Lesson readability and English translations are often hard to read or sloppy
Pacing of new concepts can jump into complex multi-digit problems too quickly
On iPhone, swiping the beads can cause the app to close accidentally (UI/UX issue)
Lacks landscape mode and other mobile usability polish