MonitorControl
Brightness and volume keys for external displays.
About MonitorControl
MonitorControl changes the brightness, contrast and volume of external displays over DDC, so the Mac's own keys and menu bar sliders work on them like on the built-in screen. Displays without DDC can be dimmed in software.
Install MonitorControl
Download it from the links above, or install it from the Terminal:
brew install --cask monitorcontrol Questions about MonitorControl
Is MonitorControl free?
Yes. MonitorControl is free and open source under the MIT license. The source code is on GitHub at MonitorControl/MonitorControl.
Where can I download MonitorControl for Mac?
Download MonitorControl from the developer's website (monitorcontrol.app) and GitHub. MacWorthy links only to official sources.
Can I install MonitorControl from the Terminal?
Yes. With Homebrew, run brew install --cask monitorcontrol.
What are good alternatives to MonitorControl?
Other utilities apps for Mac worth a look are Ice (open source), MacTools (open source), Haptiker (one-time purchase) and Bartender 6 (one-time purchase).
Other utilities apps like MonitorControl
Ice
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MacTools
A bundle of system controls in one menu bar item.
Haptiker
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Bartender 6
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iStat Menus
Your Mac's vital signs, in the menu bar.
Stats
Free system monitor for the menu bar.
Amphetamine
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Keka
The macOS file archiver.