I’ve been using Memrise for Portuguese (Duolingo only has Brazilian Portuguese, not European, and it’s the latter that I want) and it’s OK on grammar so far. Definitely better for vocab than for grammar, but that’s more what I’m looking for at this point.

Also, as opposed to Duolingo which just wanted to teach me to say “turtles do not drink milk” and “dogs do not like pasta,” its examples are mostly actually useful sentences.