TreePie is described as ': a simple way to display disk usage. It shows the distribution of size in a tree of directories by using an interactive multilevel pie (sunburst diagram). Really small and simple' and is a File Manager in the file management category. There are more than 50 alternatives to TreePie for a variety of platforms, including Windows, Mac, Linux, BSD and Flathub apps. The best TreePie alternative is WinDirStat, which is both free and Open Source. Other great apps like TreePie are WizTree, Baobab Disk Usage Analyzer, TreeSize and SquirrelDisk.