Duel for Android?
The duel feature for iOS looks really fun, I feel a bit left out using Android. Will it be released on Android or the website as well?
If you check the App Store you'll see that Duolingo is one of the featured apps.
Apple probably agreed to feature the app, giving it a lot of publicity, in exchange for Duolingo only offering the app on the App Store for a while. There was actually an article about this in the Wall Street Journal a few days back, so when the new update came out, this was the first thing that I thought of.