Disk Space Analyzer

Pick a folder and Disk Space Analyzer draws a color-coded map of everything
inside it — sized so the biggest space-hogs are instantly, visually obvious,
not buried in a list. Click into any folder to see what's inside it, all the
way down. On Chrome, Edge, and Brave the scan is fully live; on Safari and
Firefox you get the exact same complete, byte-accurate map through a
folder-picker instead of a live scan.