What is corebrightnessd on Mac?
By Junaid, maker of Taskglass · Last reviewed
Manages Night Shift and related display brightness and colour adjustments.
corebrightnessd is the daemon Apple documents as managing Night Shift, the feature that warms the screen's colours in the evening. It's also involved in display brightness and colour adjustments. It runs in the background and is normally very light.
- Category
- macOS system
- Made by
- Apple
- Safe to quit:
- With care
Shown in Activity Monitor as corebrightnessd
Why is corebrightnessd using so much CPU or memory?
- Night Shift or auto-brightness changing often
- Connecting or disconnecting displays
- Third-party brightness or colour utilities
What to do
- 1Quit third-party display utilities to compare
- 2Toggle Night Shift in System Settings > Displays
- 3Restart your Mac
Safe to quit? With care.
macOS relaunches it; Night Shift and brightness may glitch briefly.
Related processes
Part of the Taskglass Process Library