Via @wraptile@fosstodon.org on Mastodon:

@verge I've already replaced duolingo with AI. Generating flash card ideas and flashcards with AI voicing and explanations. All in \#obsidian for free!

I wrote about the process here but someone should really make it as a standalone free app:

https://upskill.quest/obsidian-with-spaced-repetition-plugin