When comparing Disk Inventory X vs WhatSizeMac, the Slant community recommends Disk Inventory X for most people. In the question“What are the best disk space analyzers for Mac OS X?” Disk Inventory X is ranked 3rd while WhatSizeMac is ranked 9th. The most important reason people chose Disk Inventory X is:
It is absolutely free and released under the GPL.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Free & Open Source
It is absolutely free and released under the GPL.
Pro Works in High Sierra and above
Pro Allows ordering disk by size
This way you can find what is taking most of the space.
Pro Offers choice between analyzing whole disk or just a specific folder
Pro Absolutely matching with Windirstat
Pro Updates information in real-time
WhatSizeMac is able to listen for file system events and update itself in real time. So it never needs a full volume measure but once in a very while.
Cons
Con Crashes on Ventura, when closing the app
But you do not need it so often, so it is ok.
Con Crashes on Sierra
Crashes on Sierra when resizing windows.
Con Poor tech support
No update for Mojave.
Con Commercial
WhatSizeMac cost $29.99 and there is a free trail available.