Super rough rule of thumb: 98% of colorblindness issues are “red and green do not contrast”, 2% are “green and blue do not contrast”. Orange and blue will contr

Super rough rule of thumb: 98% of colorblindness issues are “red and green do not contrast”, 2% are “green and blue do not contrast”. Orange and blue will contrast for pretty much everyone, that’s the safe and easy to remember bet. For creating contrast in other ways: saturation and brightness are unaffected by colorblindness and you can create contrast with them.