PowerDimmer is described as 'Distraction dimmer for Windows ala HazeOver/LeDimmer' and is an app. There are five alternatives to PowerDimmer for Windows and Mac. The best PowerDimmer alternative is WindowFX. It's not free, so if you're looking for a free alternative, you could try Cinemadrape or LeDimmer. Other great apps like PowerDimmer are HazeOver and Focusdim.
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WindowFX is the most popular Windows alternative to PowerDimmer.
WindowFX is the most popular commercial alternative to PowerDimmer.
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It is comparable to HazeOver on macOS, but is not an alternative to HazeOver as HazeOver isn't available on Windows.
HazeOver is the most popular Mac alternative to PowerDimmer.
CinemaDrape helps you focus on your current task on the screen (such as a video in a web page, a photo or a document editor area) by instantly blanking or dimming the other less important areas in a web page or in the background windows.
Cinemadrape is the most popular free alternative to PowerDimmer.
LeDimmer is a small Windows application (<200KB) that sits in the system tray and simply dims the screen around the foreground window.
It is an alternative to PowerDimmer, but hasn't been updated in a long time and is proprietary.
Professional focus enhancement for macOS. Dim background applications or highlight your active window with beautiful colored borders.
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WindowFx has a feature similar to what PowerDimmer does, however, WindowFx is paid software and does more than just window dimming.