COMSOL Multiphysics has a Windows® graphical user interface that is started by default. There is also a cross-platform graphical user interface, which is the same on Windows, Linux®, and macOS. You can start the cross-platform interface on Windows by double-clicking the file comsolxpl.exe in the bin\win64 folder in the COMSOL installation directory. The cross-platform interface is the only one available on Linux and macOS.