When comparing Swish vs Spectacle, the Slant community recommends Spectacle for most people. In the question“What is the best window manager for Mac?” Spectacle is ranked 7th while Swish is ranked 8th. The most important reason people chose Spectacle is:
Spectacle is licensed under MIT with source code available on [GitHub](https://github.com/eczarny/spectacle).
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Pros
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.
Pro Free and open source
Spectacle is licensed under MIT with source code available on GitHub.
Pro Simple hotkeys
Spectacle offers easy-to-remember preset hotkeys.
Pro Mouseless
All windows in Spectacle can be controlled with keyboard shortcuts, so no mouse is needed. This makes for a fast way to control windows.
Pro Great UX
Spectacle is easy to use and configure. It's plug and play.
Pro Low footprint
Spectacle only uses up 18-19 MB of RAM, which means there is not much overhead by using this app.
Pro Multi-monitor support
Pro 7+ years of use
Using it for 7 years
Cons
Con The tutorial within the app is not that thorough
Con Limited keybinding customization
Con Not maintained
The software is free, but no longer seems to be maintained.
Con Impossible to add new functions
While keyboard shortcuts can be changed for the available actions, there is no way to add custom actions which in turn limits the functionality of the app.
Con Limited window sizing capabilities
You can use 1/2 of the screen vertically and horizontally (divide into 4 parts). You can also use the screen in thirds too, but only the left and right third: you can't use the 1/3 in the center. There is no way to do a more granular distribution.
Con Breaks on macOS High Sierra / Chrome or Firefox
Doesn't support side by side windows.
Con Doesn't work with any Adobe products
There are some apps like Adobe Reader that do not work with Spectacle. Basically, any app with a heavily customized UI that breaks OS X accessibility will not work correctly under Spectacle.