A menu bar app that adjusts external display brightness.
Works with Apple keyboard brightness keys 🔅🔆.
On MacBook, it even syncs with auto-brightness.
No more struggling with too-bright or too-dark screens.
And it's free.
Adjust external display brightness with the brightness keys 🔅🔆.
On MacBook, auto-brightness sync keeps your displays matched automatically —
an eye-friendly workspace with zero effort.
Uses gamma table adjustment to control your external display's brightness in software. Fine-tune across 64 levels, down to 10% brightness at minimum. Screenshots and screen recordings remain unaffected, so your work captures stay clean.
When your MacBook's display brightness changes, the external stays in sync. Working hand in hand with macOS auto-brightness — when the room gets darker, external displays dim along with it, and brighten again when the lights come back. Even with multiple displays, you get a seamless, unified viewing experience.
Use your Apple keyboard's brightness keys 🔅🔆 to adjust external displays directly. Hold Shift+Option for fine-grained single-step control. You can also assign custom shortcut keys to suit your workflow.
Click the sun icon in the menu bar to open a slider for direct adjustment. The current brightness level is shown as a number, so you always know the current adjustment level. No Dock icon means zero clutter.
Because rune Lux adjusts brightness via gamma tables, screenshots and screen recordings are completely unaffected. Work on an adjusted screen, and still capture clean images and videos every time.
Plug in an external display and gamma settings are applied instantly. Disconnect it, and monitoring pauses on its own. Whether you're docking, undocking, or toggling power, rune Lux follows along seamlessly.
rune Lux lives in your menu bar and is ready to go after a one-time permission setup.
Just press the brightness key. Auto-sync with your MacBook display is on from the start.
Brightness keys 🔅🔆 and auto-sync take display adjustment to the next level.
Free to download and use.
Requires macOS 13.0 or later (Apple Silicon & Intel)