When comparing ShiftIt vs Swish, the Slant community recommends ShiftIt for most people. In the question“What is the best window manager for Mac?” ShiftIt is ranked 2nd while Swish is ranked 8th. 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.
Ranked in these QuestionsQuestion Ranking
Pros
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.
Pro Best window manager for trackpad power users
Gestures are faster than dragging or keyboard shortcuts.
Pro Multi-monitor and spaces support
Switch intuitively between screens and spaces based on their physical location.
Pro Sleek and intuitive
Pro Easy to use
Intuitive gestures, doesn't get in the way like BetterTouchTool.
Pro Custom grid offsets
The default setting uses a clean single-pixel divider without any overlaps.
Pro Matches the Mac language
Pro Fast
Just squeezing on top of an icon to close the app is a breeze compared to right clicking and selecting "quit," using Command + Q, or APP NAME -> Quit.
Cons

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.
Con The tutorial within the app is not that thorough
Con Limited keybinding customization
