The problem I found when using it for Swedish and French about 7 years ago is that it emphasises stupid vocabulary. I don't know how many times it asked me the

The problem I found when using it for Swedish and French about 7 years ago is that it emphasises stupid vocabulary. I don't know how many times it asked me the Swedish word for elephant (which you guessed it, is... elefant). Another word I remember in the first lesson was turtle (which is actually a difficult world in Swedish, sköldpaddan) which I never had to know in my first years in Sweden. Ironically it only ever came up when discussing duo lingo. So in my experience while duo lingo teaches you vocabulary, until you have completed a lot of lessons the vocabulary is useless, because you can't actually use it to do anything in the country.