Check if you text is contrasted enough, depending on color, background color, font size and font weight
Also suggests a few diffent valid colors to use instead
Why ?
I personaly found that APCA's maths are way closer to my perception of color accessibility than WCAG ('AAA' score for black on #EA7439, really ?)
At least it takes font size & weight into account, and differenciates front color from background color.