Check any foreground and background pair against WCAG 2.1. Get the contrast ratio, pass/fail for AA and AAA at both text sizes, and a suggested fix when it fails.
WCAG 2.1 requires a contrast ratio of at least 4.5:1 for normal text (AA level) and 7:1 for enhanced contrast (AAA level).
Large text (18px bold or 24px regular) has a lower minimum contrast ratio of 3:1 for AA compliance.