

I tried out a bunch, including Babbel, Busuu, Language Transfer, Mango, and Memrise. I didn’t like them for one reason or another. I finally landed on Lingodeer. It’s similar to Duolingo, but it is a paid app. (You can try level 1 of any language for free.)
The regular subscription price is definitely not worth it. It’s okay (not great, but not awful) when they do their sales. But I felt okay about paying human workers.
This kind of learning is a great start, but will only get you so far. If your local library has access to Kanopy, look for the Great Courses series on Spanish. I thought that was an excellent series after a little bit of Duolingo.
Forgive me for saying this, but the final Kelpian design looks much, um, tastier than the original one. I can’t imagine Terrans looking at a green and brown multi-eyed triangular headed alien and think “delicacy”.