ANSYS Workbench is described as 'The ANSYS Workbench platform is the backbone for delivering a comprehensive and integrated simulation system to our customers. Using Workbench for your product development simulations will result in higher productivity from integrated applications leveraging common and' and is an app. There are more than 10 alternatives to ANSYS Workbench for a variety of platforms, including Windows, Linux, Mac, Web-based and iPad apps. The best ANSYS Workbench alternative is SOLIDWORKS. It's not free, so if you're looking for a free alternative, you could try FEATool Multiphysics or Elmer. Other great apps like ANSYS Workbench are Autodesk Inventor, Catia, Solid Edge and COMSOL Multiphysics.
Solidworks is CAD software with various tools such as basic simulation. Ansys Workbench is a simulation software with various tools such as basic CAD modeling. So they are completely different in basis.