The Competition. DaisyDisk ($10) is a beautiful disk space analyzer. It's the preference of many Mac users. What it does differently is display disk usage data as a sunburst map, which some may.
What is this?
Disk Inventory X is a disk usage utility for Mac OS X. It shows the sizes of files and folders in a special graphical way called 'treemaps'. If you've ever wondered where all your disk space has gone, Disk Inventory X will help you to answer this question.
For a quick start please read the readme file on the disk image. Or see a 1 minute video about Disk Inventory X from macbreak.com.