Candela
Menu-bar app for OLED burn-in protection and controls macOS doesn't give external monitors
Candela dims static bright regions on an enrolled OLED monitor while you work, tracks cumulative exposure per app in a local grid, and runs checkups that log what the monitor claims versus what Candela observed versus what you visually confirm. It also unlocks HiDPI resolutions System Settings won't list — 27 found on one test panel — and gives external displays brightness, volume, and contrast controls the way macOS gives the built-in screen. It's free, open source, and directly names MonitorControl and BetterDisplay as its comparison points.
What holds up
- +Free and open source — one Homebrew command to install, no account or subscription
- +Found 27 distinct HiDPI sizes on a test monitor that System Settings doesn't list at all
- +Exposure tracking is local — attributes screen time by app without reading window titles or contents
Mind the limits
- −OLED burn-in protection only applies if your panel is actually OLED — LCD users get the other features only
- −Mac-only, and useful mainly if you already run external monitors macOS underserves
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