When comparing HazeOver: Distraction Dimmer vs Karabiner, the Slant community recommends Karabiner for most people. In the question“What are the best power user tools for macOS?” Karabiner is ranked 29th while HazeOver: Distraction Dimmer is ranked 56th. The most important reason people chose Karabiner is:
For example: Fn+C now calls up contextual menus for me with: <!-- Fn + C = same as right-click mouse --> <item> <name>kybd control click</name> <identifier>private.keybd_to_control_click</identifier> <autogen> __KeyToKey__ KeyCode::C, ModifierFlag::FN, KeyCode::VK_MOUSEKEY_BUTTON_RIGHT </autogen> </item>
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Pros
Pro Multiple-monitor support
Can dim all unfocused windows or highlight a window on each screen.
Pro Helps to work at night
Shading selectively reduces OS X user interface brightness.
Pro Low-level key bindings/mappings
For example: Fn+C now calls up contextual menus for me with:
<!-- Fn + C = same as right-click mouse -->
<item>
<name>kybd control click</name>
<identifier>private.keybd_to_control_click</identifier>
<autogen>
__KeyToKey__
KeyCode::C, ModifierFlag::FN,
KeyCode::VK_MOUSEKEY_BUTTON_RIGHT
</autogen>
</item>
Pro Make FN key into a new modifier key for custom shortcuts across apps
Cons
Con Difficult to configure custom actions
Configuring custom actions requires editing an XML file with very strange syntax, for which it's difficult to find good documentation.