The official app for the RTL II series "Köln 50667" offers you a lot of fun and many different ways to interact with the app. You can vote, take part in a ranking, or even try your luck in a quiz to find out how much you know about the series. If you are a fan, you will definitely want to download the app and use it to its full potential. Not only that, but you can also take part in a number of different activities that will give you the opportunity to meet other fans and interact with them. This is a great way to get to know the other people who love the same show that you do.