Freemium
axe DevTools
Industry-standard accessibility testing in DevTools.
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AccessibilityToptal's Colorfilter renders a live webpage as people with different color vision deficiencies would see it, including protanopia, deuteranopia, and tritanopia, plus grayscale. You paste a URL and inspect the filtered result directly. It is a fast way to validate that a real site, not just a swatch, holds up for color-blind users.