Recursive Directory Comparison Tool
Features
2Dirs1Cup compares two directory heirarchies for which files each has that the other doesn't.
-  Fast directory data collection.
-  Smooth progress bars, and user interface remains responsive during data collection.
-  Save and refresh default input.
-  Input sanity checking.
-  Optionally limit comparison to particular file types.
-  Output with Full Paths or Relative Paths.
-  Any file/directory permissions issues it finds are reported in summary form at the end.
Additionally:
-  Windows version runs on a wide range of other operating systems (including M1-based macOS, FreeBSD, PC-BSD, OpenBSD, Solaris, Linux and BeOS) using
Wine; and natively on ReactOS.
-  Workflow is the same in Windows, Mac OS X and Linux/X11 versions.
-  Platform appropriate look and feel.
-  Safely disables all user interface controls during processing.
-  Extensive Tooltip help.
-  Simple free use licence.
Download
Users of M1-based Macs should use the Microsoft Windows version with WINE.