[gradstudent]

I count 8 colours on this website. The 4 mentioned, plus: white (appearing in the hue slider), light-pink (background of code box) and two types of gray (appearing in the up/down widget)

Something something glass houses?

[aimor]

Well these are the colors they define:

    --primary-color: hsl(var(--hue), 50%, 90%);
    --pre-primary-color: hsl(var(--hue), 50%, 95%);
    --secondary-color: hsl(var(--hue), 50%, 10%);
    --tertiary-color: hsl(var(--tertiary-hue), 80%, 20%);
    --accent-color: hsl(var(--accent-hue), 80%, 20%);

As I see it that's either 3 colors or 5 colors but not 4

[d1sxeyes]

White and grey are shades, rather than typical colours. Any hue with 0 saturation will be a shade between white and black.

(Yes, probably there are arguments against this, but in terms of colour theory for dummies.)

[hunter2_]

So is a change of hue required in order to say there's been a change of color? I'm not offering saturation in this question, since "oh that's just a less saturated red" seems similar enough to the notion of "oh that's just a lighter red" that the two ought to be in the same "not color" boat...