Apps similar to ddcutil include Twinkle Tray, which is free and open source. Other options are Dimly, BetterDisplay, Lunar and DDCcontrol. You can choose from more than 10 Screen Dimmers like ddcutil for Mac, Windows and Linux.
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.
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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.
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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!.
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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.
DisplayBuddy lets you control external displays connected to your Mac right from your menu bar! No need to touch your clunky monitor buttons!
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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Dell Display Manager enhances everyday productivity through comprehensive management tools giving you optimal front of screen experience, efficient display management and easy, effortless multitasking.
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