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I am surprised Munsell Color system was not mentioned: https://en.wikipedia.org/wiki/Munsell_color_system

It is basically for when you want colors of different hue (chroma) but similar saturation and luminosity.

It's a pretty common technique to use HSL and some simple math to do this with CSS, but even if you use a perceptually uniform color space, colors of different hues but similar chroma/value doesn't ensure accessible contrast. It also means that in the naive case, your colors end up being very "rainbow" -y.

Stripe's color system blog post gets into the nitty gritty of getting this right, at least for curated colors: https://stripe.com/blog/accessible-color-systems

Thank you for sharing this. I had not realized the domain of colors were so magical and esoteric

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