How much effort is it to add a new language? My wife is trying to learn Serbian using spaced repetition and had an app to create her own flash cards with her own pictures and sounds, but it's very laborious
Have you heard about Memrise? It is site/mobile app dedicated to learn new language using SRS.
Apart from official content, most of the content is contributed by bilingual users. So I don't know the quality/accuracy of them, but the result is that they have lots of courses.
Apart from official content, most of the content is contributed by bilingual users. So I don't know the quality/accuracy of them, but the result is that they have lots of courses.
https://www.memrise.com/courses/english/serbian/
It is a bit hard to pick up grammar or conversationnal skills but to learn some vocabulary it is great.