Lunar Calibrate

Lunar Calibrate turns the iPhone camera into a light meter for Lunar, the Mac app that controls external monitors.

Start Calibrate with iPhone in Lunar's settings, scan the QR code on the screen and point the iPhone at all the screens at once. Lunar shows patterns on every screen while the camera measures them, then matches:

• Brightness at every step, from the lowest setting to the highest
• White point and color across all screens
• DDC contrast on external monitors
• Peak brightness on XDR displays
• Night Shift and True Tone across all screens

When the run ends, Lunar shows the original and calibrated values on each screen.

Requires Lunar 7 or later on a Mac. The App Clip opens straight from the QR code, with nothing to install.