ISY Plant Review is a desktop plugin for AutoCAD. It runs locally within the AutoCAD environment on a computer and may access files on local disk drives or mapped network drives.
It is distributed solely as a free plugin through Autodesk App Store. After it has been downloaded from Autodesk App Store the app does not require any kind of registration / sign-on to be installed and used. It does not require any Internet connection and neither collects nor shares user information / activity of any kind.