Directory Compare is described as 'Utility to help you keeping copies of your important directories (documents, programs under development and so on) in a backup hard disk or any other storage system (like USB drives or CD-RW disks)' and is a File Sync tool in the backup & sync category. There are more than 10 alternatives to Directory Compare for a variety of platforms, including Windows, Mac, Linux, Android and Android Tablet apps. The best Directory Compare alternative is FreeFileSync, which is both free and Open Source. Other great apps like Directory Compare are rsync, GoodSync, SyncToy and DirSync Pro.