Color Blindness Simulator
Preview any image — or a color pair — through all eight color-vision deficiency types, with a severity slider and WCAG contrast per mode. Nothing is uploaded.
or click to browse — JPG, PNG, WebP
Color-pair tester
Check how a text / background pair holds up under every vision type — with the WCAG contrast ratio recalculated per mode (uses the severity slider above).
AA = ratio ≥ 4.5 (normal text) · AA-L = ratio ≥ 3 (large text ≥ 24px / 18.66px bold)
How the simulation works
Each vision type is approximated with an established 3×3 RGB color matrix (the widely used Colorjack / machado-style daltonization matrices), applied pixel-by-pixel on a canvas. Around 8% of men and 0.5% of women have some form of color-vision deficiency — deuteranomaly (green-weak) is by far the most common. Everything runs locally; your image never touches a server. Free forever.