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macOS includes a "Display Calibrator Assistant" to perform some basic calibration of the built-in display.

I'm sure it's better than nothing, but how much better, I don't know.

All it immediately offers is a white point setting (I can specify a colour temperature), but after some fooling around with it I have discovered that if I launch it with an Option-click, it will provide an 'Expert mode', that will take me through a series of steps in which one adjusts sliders to make colour patches match, have squint at the display from the corner of my eye, and so on.

What other software tools - built-in, free or at least inexpensive - are available to help perform some basic calibration of the display? And, how useful are they, compared to hardware devices to do the same task?

  • You kind of moved the goalposts after I'd answered... but there's nothing better without appropriate hardware calibration. – Tetsujin Sep 4 '18 at 10:43
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If you opt-click the Calibrate... button, you get the old 'mess of steps', once you check the Expert Mode box

Without Opt...

enter image description here

With Opt...

enter image description here

It's still nowhere near as good as using a hardware colorimeter, but there's no better free/cheap option.

  • Answered before I found the Option-click to enable Expert mode and updated the question, so still a good answer. – Daniele Procida Sep 4 '18 at 11:53

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