When comparing HazeOver: Distraction Dimmer vs Notational Velocity, the Slant community recommends Notational Velocity for most people. In the question“What are the best power user tools for macOS?” Notational Velocity is ranked 11th while HazeOver: Distraction Dimmer is ranked 56th. The most important reason people chose Notational Velocity is:
The interface is clean and unobtrusive.
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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 Simple and minimalistic
The interface is clean and unobtrusive.
Pro Free
Pro Syncs with SimpleNotes or Dropbox
Cons
Con Feels a bit outdated
The last release was from 2011. Although due to its brilliant simplicity in doing what it's designed for, some might think there hasn't been any need for an update, as long as it still works with the newer OSs.