Folder Compare 2.0.4
To use Folder Compare, simply drop folders, one each, onto the designated fields for Source Folder and Compare Folder.
Once you have done a comparison, the folders you dropped are saved and appear in the quick-access pop-up menus to the right of the drop places.
Once you have clicked the Compare button, four lists appear. You have access to a few of the Finder functions on the selection you make in the lists. You can find those in Folder Compare "File" menu.
Please read the documentation for more information.