When comparing Disk Inventory X vs ShiftIt, the Slant community recommends ShiftIt for most people. In the question“What are the best power user tools for macOS?” ShiftIt is ranked 46th while Disk Inventory X is ranked 52nd. The most important reason people chose ShiftIt is:
ShiftIt is configured through a simple UI where you simply press the hotkeys you wish to map to a certain action.
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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 Easy to configure
ShiftIt is configured through a simple UI where you simply press the hotkeys you wish to map to a certain action.
Pro Free
Pro Intuitive
ShiftIt is very straight-forward to use for most frequent usages.
Pro Open source
Pro Configuration can be committed to your personal dotfiles repository
Configuration winds up living in .hammerspoon/init.lua and .hammerspoon/Spoons/ShiftIt.lua. Very easy to track configuration changes.
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 A little slow
Similar to Spectacle, but it has a few more features, such as being able to pick the size adjustment increments. Spectacle was a little faster, though. Repeated size changes or moves in succession can cause it to wait for it to complete.
Con Imprecise when readjusting sizes
Con Doesn't support moving windows between workspaces
There's no way to move a window to a different workspace with hotkeys in ShiftIt.