COMSOL Multiphysics 5.0 is an interactive environment for modeling and simulating scientific and engineering problems. Any COMSOL Multiphysics model can be turned into an application with its own interface using the tools provided with the Application Builder desktop environment. Using the Form Editor, the user interface layout can be designed, while the Methods Editor is used for implementing customized commands. For engineers working in application areas including building science, solar energy and interferometers, the product suite also includes the Ray Optics Module, a simulation tool for analyzing systems in which the electromagnetic wavelength is much smaller than the smallest geometric detail in the model. The Design Module expands the available toolset of CAD and includes loft, fillet, chamfer, midsurface and thicken, in addition to CAD import and geometry repair functionality. Additionally, LiveLink for Revit allows users to interface with the building information modeling software from Autodesk.