Check whether text and background colors meet WCAG accessibility guidelines, and get a nearby accessible alternative if they don't.
ContrastFix is a free WCAG contrast checker that tells you not just pass or fail, but what to change. Pick a text color and background color to see the exact contrast ratio, whether it clears the AA and AAA thresholds for normal and large text, and — if it fails — a nearby color that would pass, so you don't have to guess-and-check by hand in a design tool.