About this site

The site mainly started around the idea of an online generator of exercises to practice the soroban. It evolved a bit with the addition of pages with mental calculation software; then the virtual soroban and its "tutorials" and the possibility to get an operation being displayed on the virtual soroban. A forum was needed to overcome the limitation of disqus, which is a great commenting system anyway.

Donations welcome

You don't need a Paypal account if you don't have one

Since we changed hosting in August 2021 to use pythonanywhere.com, we are now billed 6€ per month. This is without counting for the domain name cost which is about 19€ per year. The total cost is then around 90€ per year.

Any donation is welcome to cover those recurring costs. I will also take them as a tip for the work I made on this site. We thank any donor in advance for their good gesture.

  • Total donation received for 2020: 55€
  • Total donation received for 2021 so far: 28€.

You may need a currency converter from/to €, you could give a try to the one at xe.com. Beware that Paypal does not use the same exact exchange rate that xe.com

Bitcoins accepted here

bitcoin logo

We are now accepting donations in bitcoins.

You can either use the new Bech32 SegWit address ::bech32::. This is the preferred method.

However, for backward compatibility, we provide also a P2SH address ::p2sh::

qrcode for bech32 bitcoin address
Bech32 bitcoin address
qrcode for p2sh bitcoin address
P2SH bitcoin address

Technologies

This is what is used to create this site

pythonanywhere logo google analytics logo Sendgrid python logo reportlab logo html5 logo flask logo jquery logo bootstrap logo vscode logo git logo archlinux logo

The current version of the site is e503741 (git HEAD commit id)

Cookies

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