In Basel, you can keep track of when trash and other refuse will be picked up. In the postal code area of 4052 there are a lot of blue trash bags on the sidewalks today. This is not a good thing since today is Good Friday and a public holiday. If the bag owners had the app, they would see that there is no refuse collection on April 10.
You can download the app called Dräggwägg on your iPhone or Android device. Details can be found here.