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The mental calculation speed rapidly becomes early by putting the abacus in the head.
This software is an application program that sequentially adds ten figures that appear one after another, and becomes familiar with the abacus.
The level of the sense from the digit number and 3 seconds from 1 digit to the treble to 1 seconds is prepared. Where can you calculate?
The mental calculation mode is prepared of course, and calculate with an abacus in the head, please. The mental calculation of the flash of the treble is not a dream.

What’s New

Version 2.1

iOS8 compatibility.
iPhone6, iPhone6 Plus compatibility.

Ratings and Reviews

4.3 out of 5
3 Ratings

3 Ratings

Yoaz Shelef ,

Good, but I wish it had a couple more functions

This is the best app that I've found for drilling rapid addition on the abacus. I use it daily, but I do wish three things were different. 1) that you could turn off the sound. I've had to tuen off my ringer to avoid the sound, then forgotten to turn it back on an missed calls. 2) better instructions. I didn't realize you have to pass a speed round in order to practice with more than 1 digit. 3) Addition only. I wish you could choose subtraction only or mixed
Addition and subtraction. Simple multiplication or division would be nice too. Overall I really enjoy it, hopefully new versions will include these features.

sculptingman ,


Very effective training for improving your abacus speed...
You have to make each speed mark to enable the next, and the first three to enable the two digit... Seems odd, but frankly until you master single addition at 2 second speed you haven't a prayer of getting thru two digit addition at 3 second speed.

I do wish it had two features... A working volume function... your only choice is to turn the phone switch to silent, or have it annoyingly loud.
... And it should mix in subtraction as well as addition...

But as a basic tool to train yourself to work a soroban abacus without hesitation and stumbling... This will do it.

chrozz ,

Best abacus app.

Learned addition on abacus fast.


hiroyuki nisiguti
5.2 MB

Requires iOS 6.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Japanese

Age Rating
Rated 4+


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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