I have never used Duolingo on my mobile. I have been meaning to try the app on my Android but haven't done it yet. I love it on the PC though. It is one of the best language learning app I have ever used. Even though it has some quirky moments here and there, it has got a lot better than when it first came out (yes, I am an early user). Anyway, thank you for the heads up, I will keep this in mind when I try out the mobile app.