Disk Inventory X

Disk Inventory X is a Mac app from Tjark Derlien for analyzing storage usage and displaying folders and files in color-coded treemaps to make it easier to quickly identify and manage files taking up the most space. You can choose volumes or folders to analyze then click on the treemap to see which files/folders are using blocks of space or vice versa.

Disk Inventory X 1.3 is freely downloadable, open-source donationware for macOS 10.13 and up, and Disk Inventory 1.0 is available to support Macs all the way back to Mac OS X 10.3.  The latest version adds support for macOS 10.15 Catalina.