What are third color generators for website color map?

Question

css

Good afternoon!
Can you please tell me if there are such online generators for the third color for the sitemap?
Those. enter two colors that you are already using, then click, and it will be your third (possibly fourth, etc.) color.)
Thank you!

Answer 1

https://color.adobe.com/create/color-wheel/

Answer 2

The third color is the background. Usually white or black.
It turns out the classic primary, secondary, light / dark

Answer 3

CorelDraw has color mixers
Two kinds of triangles, pentacle, complementary.