Although the article is intimidating, the implementation appears pretty simple and flexible. Has anyone tried using this either in the Darktable app or in their own libraries? I might like to try porting it to JS to compare it for web based color picker GUIs.

This is an incredible reference, thanks.

Someone else was mentioning Oklab color space, and I was wondering what the difference was to darktable UCS.

TL;DR: Oklab is pretty simple, but is already pretty nice as a perceptually uniform color space. Darktable UCS takes Oklab and tries to reduce the residual error.

Feel free to correct me if I got anything wrong