Comparison
Sundown vs Night Shift: Why Built-In Isn’t Enough
Night Shift stops at roughly 2700K. Sundown reaches 500K. Side by side, the difference is easy to see.
Feature
Sundown
Night Shift
Filtering range
500K–6500K500K–6500K
~2700K max
Kelvin display
Real-timeReal-time
Flicker-Free Mode
Gamma dimming, backlight steadyGamma dimming, backlight steady
Scheduling
CustomCustom
Sunset to sunrise, or custom
Keyboard brightness
F1/F2 interceptionF1/F2 interception
Anti-dithering
Apple SiliconApple Silicon
Presets
Eight Kelvin presetsEight Kelvin presets
Price
$4.99/mo (7-day free trial)$4.99/mo (7-day free trial)
Free (built into macOS)
Night Shift stops at roughly 2700K. Sundown goes to 500K.
Night Shift is a mild warm orange. At 500K, Sundown is a deep red, and you choose where your screen sits anywhere from 6500K down to 500K, in steps of 100K.
~58%
More nocturnal melatonin with blue-blocking glasses
~24 min
Longer sleep with the same glasses
Melatonin and sleep-duration figures: Ostrin et al. 2017 (PMID 28656675): healthy adults wore short-wavelength-blocking glasses before bed for two weeks. A study of glasses, not of Sundown.
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