A macOS menubar app that drives your external monitor's brightness over DDC/CI — the F1/F2 keys follow the display you're working on, ⌥F1 blacks it out, ⌥F2 brings it back. No window, no Dock icon, no telemetry.
A slider per external display in the menubar, written straight to the panel over I²C (VCP 0x10).
The brightness keys follow the display your active window is on. The built-in keeps its native keys.
⌥F1 drops the panel to true black via DDC standby — below the backlight floor; ⌥F2 wakes it to full.
Send an external monitor to standby and back from the menubar — no reaching for the buttons.
The MacBook display shows up in the same panel, driven through DisplayServices.
Signed and notarized, delivered to the app. Click once and you're current.