The GrippeNet app is used to ask the Swiss public to report flu-like symptoms and to analyze their spread. Users will receive information about the flu situation in Switzerland as well as information concerning flu in general. GrippeNet app collaborates with grippenet.ch and is used as mobile version of grippenet.ch. The app is provided by DFKI in cooperation with ETHZ and and University of Geneva (operators of grippenet.ch). Grippenet is part of a European initiative for scientific citizen participation to observe influenza-like diseases in order to understand and to model their spread. We are looking forward to reaching as many people as possible for participating in the survey in order to give our interpretations more meaning. Please inform your friends and family!