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Ronald ter Veen
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Even though I quite like the concept, the price (€ 2,29) is too steep for a goof or two so I wasn't able to give it a spin.
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Ronald ter Veen
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As alternative, macOS Sierra 10.12.4 (currently in beta) now has Night Shift build in.
f.lux
Adjusts your computer's display to adapt to the time of day