A pust notice feature
Right now Wunderlist is inactive unless it is open, that means unless you check your wunderlist everyday in order to not risk missing anything. For an app that is supposed to work as a reminder of events and appointments in a simplifyed way that effectively makes the app useless in it's current state. This can be fixed however by adding a push notice feature (just like facebook and the messenger app has) that can signal you directly to your phone, by signals, pop up windows, as well as notices directly on the app icon to let you know something has come up. Today wunderlist doesn't even inform you like that when you schedule an event to remind you, even if you mark it with a star. I suggest wunderlist inplements a feature like that which facebook has to actually make itself useful, otherwise the next schedueling app that comes along and implements something like that will make wunderlist obsolete.