DisplayBuddy is described as 'Lets you control external displays connected to your Mac right from your menu bar! No need to touch your clunky monitor buttons!' and is a Screen Dimmer in the system & hardware category. There are more than 10 alternatives to DisplayBuddy for a variety of platforms, including Mac, Windows, Linux, openSUSE and Python apps. The best DisplayBuddy alternative is Twinkle Tray, which is both free and Open Source. Other great apps like DisplayBuddy are Dimly, Crisp - Monitor Control, MonitorControl and Monitorian.
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.
Open-source macOS menu utility for unified brightness, blackout, and sleep control of external monitors, using hybrid DDC/CI and software overlays, per-display settings, custom profiles, hotkeys, panic shortcut, privacy by design, and secure signed builds.
Open-source macOS menu bar app enabling HiDPI scaling on external monitors, DDC brightness with software dimming, icon-based display presets, virtual displays, drag-to-arrange multi-monitor layouts, ICC profile switching, auto-brightness sync, and quick access toggles for display modes.
It is free + has way more features than DisplayBuddy.
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...
XDR brightness boost app for Mac — push your display to 1600 nits using native EDR overlay, with color accuracy preserved and better battery efficiency.
Windows implementation of the ddcutil Linux program for querying and changing monitor settings, such as brightness and color levels.
BrightIntosh is lightweight, works system-wide, has optional launch-at-login functionality and includes a global hotkey to toggle the extra brightness.
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.
The app lets you control the brightness of all your screens (both laptop and desktop) by a single click on a tray icon. Its look goes nicely with the system icons and it supports both light and dark mode.
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Great except on my Dell S2721DGF the screen will go black after it wakes from sleep a lot of the time and will not respond until I fully pull the power plug to hard reset the monitor. Dev has no fix unfortunately.