Twinkle Tray enables brightness control on external displays in Windows 10 & 11. Even th Windows is capable of adjusting the backlight on most monitors, it doesn't support external monitors natively.

MonitorControl is described as '🖥 Control your external monitor brightness & volume on your Mac' and is an app in the audio & music category. There are more than 10 alternatives to MonitorControl for a variety of platforms, including Mac, Windows, Linux, openSUSE and Python apps. The best MonitorControl alternative is Twinkle Tray, which is both free and Open Source. Other great apps like MonitorControl are Monitorian, ddcutil, Brightintosh and Lunar.
Twinkle Tray enables brightness control on external displays in Windows 10 & 11. Even th Windows is capable of adjusting the backlight on most monitors, it doesn't support external monitors natively.

Monitorian is a Windows desktop tool to adjust the brightness of multiple monitors with ease.

Most monitors, other than laptop displays, have a Virtual Control Panel (VCP), which implements features defined in the Montor Control Command Set (MCCS). Typically, ddcutil communicates with the monitor's VCP over an I2C bus, as per the Display Data Channel/Command...
BrightIntosh is lightweight, works system-wide, has optional launch-at-login functionality and includes a global hotkey to toggle the extra brightness.




DisplayBuddy lets you control external displays connected to your Mac right from your menu bar! No need to touch your clunky monitor buttons!




DDCcontrol is software for controlling monitor parameters such as brightness, contrast, and RGB color levels. It includes a command-line tool and a GUI tool.
Unlock your displays on your Mac! Smooth scaling, HiDPI unlock, XDR/HDR extra brightness upscale, DDC, brightness and dimming, virtual screens, PIP and lots more!.


Simple Screen Brightness is a small portable application written in C# that allows you to adjust the brightness for all of your connected monitors using a slider without having to use their difficult-to-use built-in menu systems.



TotalXDR is a macOS menubar app that removes the brightness limit of your MacBook Pro display and keeps XDR/HDR brightness always on.

Unlike MonitorControl, Brisync require you to have your built-in display on.