Yes, it seems that Duolingo will encourage and reward you for using the app, even though your rate of learning is not increased more by this. It seems that the

Yes, it seems that Duolingo will encourage and reward you for using the app, even though your rate of learning is not increased more by this. It seems that the better language learning app would rather ask you to use the app less, if you make more progress when you do use the app. The collection of recently failed flashcards that you can iterate is a great feature. It is somehow an automatic feature of spaced-repetition apps, since recently flashcards are shuffled into the stack at a higher frequency.