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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darkbright-helper AlternativesScreen Dimmers and other similar apps like darkbright-helper
darkbright-helper is described as 'Hotkey dimmer for Windows monitors that does not stop at 0%: it lowers the real backlight over DDC/CI, then keeps dimming with a black overlay below the hardware minimum' and is a Screen Dimmer. There are five alternatives to darkbright-helper for Windows. The best darkbright-helper alternative is Twinkle Tray, which is both free and Open Source. Other great apps like darkbright-helper are Monitorian, Dimmer, PangoBright and Monitor Bright.
Alternatives list
32 Twinkle Tray alternatives
27 Monitorian alternativesMonitorian is a Windows desktop tool to adjust the brightness of multiple monitors with ease.
58 PangoBright alternativesScreen dimming software that allows you to control the brightness of your screens as well as external monitors.
19 Monitor Bright alternativesMonitor Bright reduces with a simple trick the monitor brightness. Useful to use the PC at night without getting blind if the minimum brightness that can be obtained adjusting monitor settings is still too high if compared to ambience brightness. Supports multi monitor systems.
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