I manually extract RGB colors for 225 websites and graph them: red > blue > green > purple > yellow–brown.
To extend Gwern.net link-icons to include site-specific color when interacting with them, I collected 225 RGB hex colors from websites or their logos.
I visualize the color distributions in R in several ways: by channel, pairs of channels, color wheel, and 3D scatterplots.
The collected colors show polarization of website design towards either red or blue as the accent/icon color, but little yellow–brown.
This shows the interesting primacy of red vs blue, but also suggests that maybe they have become overused, and people should explore the other colors, like yellow–brown.