Yeah, that's fair -- you can view Duolingo as just, basically, a fun game, and you do learn something.

But I do think there's space for something equally entertaining (not anki decks!) and more effective.

I learned Spanish decently well, and I think one of the most helpful things I did for that was just hanging out with people, speaking Spanish, and drinking -- not grueling at all, very fun!

What's the app equivalent of that?