Of course, you can already do something similar to this on your Mac just by hitting “ctrl-opt-cmd-8” (Go ahead, try it…it’s fun.)
But Nocturne offers some subtle improvements that make this worth the download.
Proper color correction in monochrome modes – you don’t lose all your blues or reds when you tint the screen.
Window shadow toggling – if glowing windows aren’t your thing.
Background removal – hide the desktop picture so you don’t see a inverted version.
You can download Nocturne here.