You can create a smart list that just shows overdue tasks; that would then be viewable in the app.

Maybe shade the task or the text a choosable color

@andrewski The effect of having overdue in today's task list as it is in the mobile client is that it feels like a massive list that I can never complete. The web UI does the right thing by making today really today. That gives me the feeling that I can complete all of today's tasks. The mobile client UI is just depressing.

With the new UI on the mobile client, I notice that there is room just to ad another line just before "today" and after "This Week". You could put "overdue" there with not much effort.

It would make a world of difference for me, because then I get the feeling I can reach that green bar at least for today. The current mobile UI prevents me from having that feeling, and I have to use the web UI.

Oh, This comment is for the iPhone app. I don't use the Android app. My point still stands, of course. :)