[edwintorok]

Colorbrewer2.org has a colourblind safe version. https://peterkovesi.com/papers/ColourMapsForColourBlindIAMG2... talk about designing colormaps in the colorspace of a particular colorblindness (instead of checking whether it is safe after the fact which is non-optimal). My very basic understanding of that is that it'd replace sRGB with a colorspace that represents a particular colorblindess and then uses the same algorithm it'd use on sRGB to obtain a nice scheme in the colourblind space (or at least as much as it is possible given the constraints/reduced gamut).

I am not colourblind though, so I can't vouch for how good these are in practice, but at least there is some systematic thought that went into the process instead of ad-hoc rules.

[solasluaith]

Colorbrewer is safe for CVD but not optimized to be as distinguishable as possible no matter your impairment as far as I’m aware. That’s what I’m trying to do in a different project.

Colormaps have very different constraints due to having to cover a continuous ramp and are therefore also not optimal for categorical palettes. I personally like these the best overall: https://www.fabiocrameri.ch/colourmaps/ but there are many good options at this point.