Android App: Offline mode + tips
Duolingo save the next lessons which haven't been succeeded yet while we are online so we can practise a bit offline. But as far as I know, there is no way to check if the lessons are fully preloaded or not. Therefore I often leave home thinking I will be able to practise in the train, but I can not because nothing was fully saved. Also the possibility to decide ourself if we want to save some extra units (already succeeded or not) would be nice.
Moreover, online or offline, the tips are only available on the website, but not from the mobile app. It could be nice to change that.