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I didn’t like the available offers, so I build my own shitty macOS app for that once, you can get it here: https://github.com/TN1ck/BrightnessChanger

Maybe it interests somebody.

Thank you! Works on my 2014 Mac Mini to HP 25f monitor os X 10.13.6.

Did not work through an HDMI switcher but works fine when directly connected.