Android App: Offline Grading
I really like using Duolingo on my smartphone. However, I use it every day on my way to and from school. This train ride is very long and throughout most parts I have bad/no reception.
I know Duolingo downloads lessons so I can use them offline, but the grading still needs to be online - which renders the Duolingo App pretty much useless for my use.
My suggestion is that you also download a few solutions for each exercise, so if I at least key in a common translation I wouldn't have to wait 5 minutes till I get to see the next exercise. It's especially annoying when it's one of those "Translate 'city'" exercise, which only has one correct solution (in the case of city).