The Stylus model world offers intriguing parallels to the world of bacterial genetics. Combined with its computational tractability, this makes it an attractive system for evolutionary simulations. Here we describe a new app that adds ease of use to these advantages. The free Stylus app (for Mac, Windows, and Linux) brings all aspects of Stylus under the control of a simple graphical user interface and facilitates sharing of all key components of a Stylus project: genes, methods, and experiments. The ease of working with these components and of downloading data and graphics will suit both beginning and advanced users.