Diff Doc is described as 'Compare Files Using ' Diff Doc' a visual file compare and folder compare utility that creates a detailed file diff. File comparison can optionally be done with the command line. Compare Word and Compare XLS files in addition to PDF, txt, rtf' and is a Diff Tool in the file management category. There are more than 50 alternatives to Diff Doc for a variety of platforms, including Windows, Mac, Linux, Web-based and BSD apps. The best Diff Doc alternative is WinMerge, which is both free and Open Source. Other great apps like Diff Doc are Meld, Beyond Compare, KDiff3 and P4Merge.