Here’s the Deal

SizeUp vs KWM

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When comparing SizeUp vs KWM, the Slant community recommends SizeUp for most people. In the question“What is the best window manager for Mac?” SizeUp is ranked 12th while KWM is ranked 18th. The most important reason people chose SizeUp is:

SizeUp has user-configurable keyboard shortcuts for a set of pre-defined actions.

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Common Questions

What is the best window manager for Mac?

What are the best Mac window managers with support for multiple monitors?

Pros

Pro
Keyboard centric

SizeUp has user-configurable keyboard shortcuts for a set of pre-defined actions.

Pro
Supports multiple monitors / spaces

Windows can be sent to different monitors and spaces. It can also be aligned as needed.

Pro
Simple

SizeUp is easy and simple to use without having to configure.

Pro
AppleScript support allows extending functionality

AppleScript permits adding features such as tiling all open windows. Additionally, FastScripts it allows the user to add keyboard shortcuts to AppleScripts.

Pro
Menubar dropdown for shortcuts

Learning a bunch of keyboard shortcuts right off the bat may be difficult to remember at first, which is why a menubar shortcut for the app exists with all the shortcuts listed.

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
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.

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
Software is free and open source

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.

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Cons

Con
Nag window

If a license is not purchased there is a nag window (which suspends function) that pops up when loading the app (at user login). The nag pop-up is also summoned at certain time intervals and by performing a certain number of commands (manually or by keyboard shortcut).

Con
No on-the-fly split screen window settings

Unlike some other tiling window managers, SizeUp has no way to change the size of split screen actions on-the-fly. Any time a user wants to change how much room on the screen a window takes up when using the split screen function, they will need to manually change the settings, which can be time consuming.

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 macOS 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.