FolderSizes is described as 'Provides an engaging, interactive disk space analysis experience that you must try yourself to truly appreciate. More than just a series of diverse reports, FolderSizes allows you to visualize your disk space usage from multiple perspectives, like SequoiaView' and is an app in the system & hardware category. There are more than 50 alternatives to FolderSizes for a variety of platforms, including Windows, Mac, Linux, BSD and Flathub apps. The best FolderSizes alternative is WinDirStat, which is both free and Open Source. Other great apps like FolderSizes are WizTree, Baobab Disk Usage Analyzer, TreeSize and SquirrelDisk.