When comparing Spectacle vs KWM, the Slant community recommends Spectacle for most people. In the question“What is the best window manager for Mac?” Spectacle is ranked 4th while KWM is ranked 20th. The most important reason people chose Spectacle is:
Spectacle is licensed under MIT with source code available on [GitHub](https://github.com/eczarny/spectacle).
Ranked in these QuestionsQuestion Ranking
Pro Free and open source
Spectacle is licensed under MIT with source code available on GitHub.
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 Low footprint
Spectacle only uses up 18-19 MB of RAM, which means there is not much overhead by using this app.
Pro Simple hotkeys
Spectacle offers easy-to-remember preset hotkeys.
Pro Great UX
Spectacle is easy to use and configure. It's plug and play.
Pro Multi-monitor support
Pro Works in the same way that Xmonad & i3 does for Linux
For those who would like the same tiling window management of Xmonad and i3.
Pro Highly configurable
Using the config file (kwmrc) you can configure a variety of options including Window spacing and padding, borders, hot-key commands, etc... There are those who would say that the possibilities are limitless.
Pro Software is free and open source
Pro Windows respond very fast
Most users claim the tiling and splitting of the windows in KWM respond more quickly and more reliably than the only other known window manager of its type: Amethyst.
Pro Runs in the background
The application runs in the background. There is no indication that it is running except the automatic tiling of the windows. There is no menu bar icon or icon in the dock.
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 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.
Con No longer being developed.
Sadly the developer has moved on to work on a different project (Chunkwm), so there will be no more updates for KWM. However the code works well; no matter what version of Mac OS X you are using.
Con Takes long to set up
You need to use the terminal and edit the configuration file in order to adjust it to the way you want. This might be a little confusing for basic users. But once you have it set, you can just copy the config file and use it on a multiple amount of machines.
Con You need HomeBrew to install it
Homebrew is required to install it. Takes more to get it work in the terminal to get it installed and working on your system.