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.