Comment by jiggawatts

I really liked this article: https://bottosson.github.io/posts/oklab/

OKLAB is a perceptual colour space, which is really useful for things like colour-picker tools, image editor controls, web development, CSS styles, etc...

You can use this kind of colour space to make two colours that are equally bright and equally saturated, but exactly 180 degrees apart on the colour wheel. If you use this instead of RGB hex codes, you get much better looking results. It'll make your app or web page "pop" with minimal effort...