Choose two colors to begin.
Contrast result:
Readable sample text
How it works
Each sRGB channel is linearized, then combined as relative luminance using the WCAG 2.x coefficients. Contrast is (lighter luminance + 0.05) ÷ (darker luminance + 0.05). Normal-text thresholds are 4.5:1 for AA and 7:1 for AAA; large-text thresholds are 3:1 and 4.5:1.
Limits and assumptions
This numeric check covers opaque six-digit HEX colors and WCAG 2.x text contrast thresholds. It does not evaluate font size, weight, gradients, transparency, images, focus states, non-text contrast, or overall accessibility conformance.