Pocket Code allows you to create and execute Catrobat programs in a visual, “LEGO-style” programming environment. Pocket Code and Catrobat are inspired by MIT’s Scratch but independently developed and entirely running on smartphones and tablets – no Laptop or PC whatsoever is needed to create or execute Catrobat programs. With Pocket Code you can develop your own games, animations, or music videos, taking advantage of multi-touch, built-in sensors, and the full display resolution of your device. It also allows wirelessly controlling external hardware such as Arduino boards, Lego Mindstorms robots, or Parrot’s AR.Drone. Pocket Code allows you to download Catrobat programs that others have made and upload programs to the Web, all under free open source licenses to foster learning, sharing, and remixing. All major mobile platforms are supported. Google is promoting Pocket Code through their Google Play for Education platform, and Catrobat has been chosen as the official programming language for OLPC tablets. Pocket Code encourages tinkering and allows you to iteratively create your own apps using just one finger. A first app can be running in less than one minute. I will demo Pocket Code live during my presentation and report about our experiences in physics project at school.