abacus9 is a development side project i'm currently working on during free time.
a video demonstration of using the website is also available (here)

the current features of abacus9 are

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3 abacus types, each with 9 columns soroban (そろばん) - 1 upper bead / 4 lower beads suanpan (算盘) - 2 upper beads / 5 lower beads binary abacus - 1 bead practice exercise - setting the abacus to a random value responsive viewport and styling to support desktop and mobile devices
my other programming projects can also be viewed here: (fbacarisas.xyz/video/#programming_playlist)

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Soroban (そろばん)

sharable link: https://abacus9.com/#soroban

you can use the up/down (▽/△) buttons on the abacus rows to modify the abacus values

background - each row in the abacus represents a digit; the top bead has a value of 5 while each of the bottom beads has a value of 1. a number is counted when beads are positioned towards the middle beam (hide description)

Suanpan (算盘)

sharable link: https://abacus9.com/#suanpan

you can use the up/down (▽/△) buttons on the abacus rows to modify the abacus values

background - each row in the abacus represents a digit; each of the top beads has a value of 5 while each of the bottom beads has a value of 1. a number is counted when beads are positioned towards the middle beam (hide description)

Binary abacus

sharable link: https://abacus9.com/#binary

you can use the up/down (▽/△) buttons on the abacus rows to modify the abacus values

background - each row in the abacus represents a binary digit; a bead on the top represents the value of 1 while a bead on the bottom represents a value of 0 (hide description)