I tried a little Japanese (the second language I know best). Not sure where the content comes from but the translations were wrong, the vocabulary was strange, and otherwise the cards did not work out for me. Seems like they were auto generated via AI or google translate or something, in any case they were not accurate or natural sounding. Maybe other languages are better but I wouldn't know enough to tell.

Anki is one of my favorite pieces of software ever so I was definitely willing to try yours. Seems like the feature that defines your app is auto-generation of a card / set of cards. Didn't see any way to create your own card, all you can do is put in an English word and get the automatically generated card added to your deck. So if that's not working well the entire thing crumbles.

Interesting idea that might have a future if it finds significant improvement. I think if it was ironed out I would still prefer it to spit out an anki compatible deck that I can use in Anki itself instead of in the ricotta web app.