This is awesome.

Tested for Japanese. No problems so far, except sometimes repeating the desired number of times didn't work (mobile). Seems to work now.. But looping infinitely produces only three repetitions.

Really good UI with little friction: easily hone in on sentences, easily move on or jump ahead, see vocabulary, create Anki deck. Took a while to discover loop settings, but it's a good choice.

Only now discovered the "custom span loop mode". Great! I was about to ask for it!

AI mode is unobtrusive and helpful.

At last, found something that could need a touch up.. The starter deck from the example story is a bit nonsensical. It features words like URL and site from the Librivox intro. お is "translated" as "honorific" which is kind of true, but it's only a marker. A beginner might not know this. たち shows as answer "plural marker", there it worked. Integrating a flashcard app is no small feat. Impressive. I wonder what algorithm was used. Does it scale?

That's all. Thumbs up!