I would like to learn a couple of languages (polish and Japanese - I already learned Spanish to a decent degree) but it seems like every solution is closed source.
I would use books but listening (and speaking) are very important and books won’t help with those.
What would you guys recommend?
I get what you mean, but the speaking excersizes involve them recording me speak. That is kinda sketchy in my opinion. It also uses adverts, so transparency is kinda important (again, in my opinion)