See your colours as people with colour blindness may see them, and find pairs that could be confused.
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How this works and its limits
Simulation. Deuteranopia, protanopia and tritanopia use the published model of Machado, Oliveira and Fernandes (2009), applied in linear sRGB to your original colours. The same transform is used for swatches, images, charts and exports. Tritan results are the least reliable.
Pairs to review. Every pair is compared under each simulation with the CIEDE2000 colour difference. Pairs closer than the threshold are flagged for you to look at. The threshold has not been calibrated against people, and colours that only decorate need not differ.
Contrast. WCAG 2.2 contrast is checked on the actual colours of the uses you mark, never on simulations.
Limits and privacy. Approximate simulation. Individual colour perception and displays vary. This is not a diagnosis or an accessibility certificate, and the grayscale preview shows lightness only. It has not been reviewed by people with colour-vision differences. Images stay on your device.