Ah OK, though I'm still curious how there can also be an apparently unrelated online offering at supermemo.com. FWIW, from the very brief experience I've had so far I'm not super impressed, but I'll try sticking with it for at least the month of the free trial.

Ah, right I don't know the story. Anki has similar problems (a competing service with the same name because IIRC Anki didn't trademark its name).

they are working together. supermemo.com is based on the same algorithm but is designed to be more mainstream (no advanced stuff like incremental reading & hard to make your own cards).You can buy high quality language courses there(no need to make all the cards). I have both since supermemo.com has an app for the phone.

The top-level comment links to a wired article which actually references the paid language learning tool.