I’m still a bit confused on using a calibrated display profile in Darktable. I’m running Darktable on MacOS. I’ve calibrated my monitors with Spyder X and generated an ICC profile for each of the monitors (within 99% of sRGB). The monitor profiles are applied at boot, so the monitors are very close in color.
My question is, do I need to apply the monitor profiles in Darktable, too, or is that double applying them which makes the display further from correct?
It won’t be double applied. I specify it in Windows so that I don’t have to trust the “system” selection… but if you think there is a difference you could take a snapshot…then compare if it makes a difference
Make sure the monitor profile in darktable is the one you’re using and you’ll be fine.
if you applied the profile within apple then keep the setting on system profile. macOS is fully color managed … (windows users aren’t the best reference if it comes to color management on macs. 
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Thank you, @MStraeten. I thought this was the right approach, but when I read the DT docs I was beginning to wonder if there was a limitation on MacOS about managing the color profile. I don’t see colord in the process list, and I know darktable-cmstest is Linux only, so I was questioning if DT couldn’t read the display color profile and my colors would be off.
I’m intimately familiar with Windows limitations, particularly around displays. I like to joke (true story, though) that one of the first things I did when I left Microsoft after 15 years as an employee was buy a MacBook. 