[signal11]

This is very cool, thank you!

Interestingly the difference between some of these colours is (to my eyes / monitor) ... very little?

E.g. chartreuse and lawngreen, palegreen and lightgreen, mediumturquoise and darkturquoise, etc.

[munificent]

Color perceptiveness varies surprising widely across people.

I took a test a while back and discovered that I'm apparently the color equivalent of a super-taster. I have extremely fine color perception.

In the examples you list, lawngreen looks darker, bluer and a little more saturated than chartreuse. Palegreen is much lighter than lightgreen and somewhat more saturated. Mediumturquoise is bluer, darker, and duller than darkturquoise's greenish tint.

Note, of course, that your monitor and viewing environment will affect your perception too.

[jedberg]

Out of curiosity are you male? There are physical differences between men's and women's eyes where men's eyes are better at edge and motion detection and women's eyes are better at detecting the difference between blue and green.

Or at least adults are, possibly because of the environment they grew up in (the science is still murky on that one).

[leephillips]

Some women are even tetrachromats, with four different color receptors (it’s pretty rare).

[jedberg]

That's orthogonal though. Both men and women can be tetrachromats, it's just more common in women (but exceedingly rare in both populations).

[signal11]

Yes; thanks for pointing that out, that's an important factor too, I guess.