This site is the web implementation of @phun-ky/moebius:

@phun-ky/moebius (Möbius) was created to fit a need I had regarding
color palette generation, and as a little challenge to myself. I was
never happy with the current online palette generators, and I did not
want a "set up" palette, I wanted something that was generated, ready to
use, and something that I could use as inspiration on colors to choose
from in my projects.