This is great, thank you for sharing. I need something like this for my current project I'm working on... Much easier than trying to build a color palette manually.

I also recommend Color Brewer, which is integrated already in a lot of visualization tools, and has great options for display variants and accessibility options : https://en.wikipedia.org/wiki/ColorBrewer

Related, the OG, with research behind it- https://colorbrewer2.org/.

It's functionally very close to https://colorbrewer2.org, which has been online for more than 15 years. I think it's not a coincidence, and some credits wouldn't have hurt anyone...

Also, I have personally been using iWantHue to generate large palettes for more than 10 years now, and I'm still very happy about it: https://medialab.github.io/iwanthue/

See Fabio Crameri's colour maps for accessible yet pleasing schemes and gradients to accustom various vision impairments [0]. Ben Jann's collection also provides a valuable resource and inventory of recent and historic colour schemes included in different statistical packages [1].

[0] https://www.fabiocrameri.ch/colourmaps/

[1]: https://repec.sowi.unibe.ch/stata/palettes/colors.html

Definitely not colorblind-friendly (color contrast too low)