HazeOver helps you focus by emphasizing an active window by fading out inactive ones.
Heavy multi-tasking kills your concentration. All those tweets, emails, chat messages and lolcats staring back at you from the background. They strive for your attention. And you only have that much of it.
Don't let yourself drown in scores of open windows. Hiding, switching, looking for the right one, more hiding, more switching. Calm down, breathe in, breathe out, launch HazeOver, and finally focus on what's you've been up to.
HazeOver automatically highlights an active window or app when you switch windows. The less important things gently fade away in the background, improving your attention span.
Set the hazing intensity and speed to your liking. Be it a soft dimming, an undemanding hint of focus. Or a powerful dark background for outright dedication to your current task.
This is a fabulous that does exactly what it's supposed to do and does it well. It darkens all windows of the computer screen other than the one on which you're working. It can be set up to darken 100% (black background) or none (0%) and everything in between It's easy to turn on and off from the menu bar. It can change the background color to any you wish and it can work with multiple monitors.
$4.99?! It's so inexpensive that it's worth buying regardless of whether you wind up liking it or not.
While there are quite a few similar apps, HazeOver won me with its low CPU requirements, beautiful aesthetics, nice customization and absolutely great support from the developer -- go ahead and give it a try :)