Hundreds of thousands of downloads and 4.5 stars from hundreds of reviews in the app stores don't lie. We have applied a user-centric approach to the design of Telekom Sport right from the start. We have invited users to concept tests and prototype tests. Eyetracking and emotion tracking have been employed and thus iteratively improved the product. There is no single launch of the app; we are constantly responding to the fans and renewing and developing the product.