AppVault
f.lux
Make your screen color adapt to the time of day. Warmer at night, like natural light.
f.lux adjusts your screen's color temperature based on the time of day — cool blue-white during the day, warm amber at night. This reduces eye strain and improves sleep by aligning your screen with natural light cycles. The original blue-light filter, predating Apple's Night Shift and Windows Night Light. Free for Mac, Windows, and Linux. Set your wake time and f.lux handles the rest automatically. Subtle and transformative.