Your Mac will need macOS 10.12.4 or later to work with Night Shift. You’ll still get more customization out of Flux like the ability to gradually increase warmth over time, but Night Shift is built-in and very easy to use. The feature is very similar to Flux for Mac, although macOS Sierra’s upcoming update makes color temperature shifting a system-level feature. After sunset, Night Shift will shift your display colors to the warmer end of the spectrum, making the display easier on your eyes. In the morning, your display returns to its regular settings. Night Shift adjusts the color of your display after sunset. Many studies show that exposure to bright-blue light in the evening can affect your circadian rhythms and make it harder to fall asleep. This is how Apple describes its Night Shift feature:

Here’s how to enable Night Shift on your Mac and how it works.

One year after introducing Night Shift on the iPhone and iPad, Apple is bringing its display color temperature feature to the Mac starting with macOS 10.12.4.

Disable accessibiity in mac os 10.12