Everyday a new interactive city tool pops up and reaches you through the web, mobile devices or sensors in the city. These city platforms promise to provide you a more transparent governance, a greener future, more efficient mobility, better connected citizens or higher living quality. Is this really the case? Which one of these platforms actually make a real change? We invite you to the Majority Report to puzzle over interactive city tools. Which platform are you using really effectively? Do you have a story of an interactive city tool which caused a change in your life? Would you mind giving your feedback in a public event?