The mClient runtime is a complete packaging of the OpenROAD Virtual Machine for Windows Mobile and Windows CE. It allows standard OpenROAD image files to be dropped onto a mobile device and run with simple tap-and-run execution. Although a mobile application is constrained by the size of the display, mClient runtime can run all aspects of the OpenROAD language.

Client/server applications are not suited for mobile devices because they move in and out of network range; however, mClient supports the HTTP transport to the OpenROAD Server, which can be used to build completely stateless OpenROAD applications.