Humans often use graphs, diagrams and 3D-models to visualize complex systems, in order to comprehend them better. While this kind of software does exist, it is not easily accessible via mobile devices. This thesis will explore and explain the design process of developing a web application for visualizing and creating complex systems, natively supporting handheld devices. The innovative nature of this thesis calls for a suiting research process, which we will describe together with what design decisions led to satisfying functionality.