About This Tool
Documentation
What does this tool do?
An accessibility compliance testing tool that calculates exact color contrast ratios according to the WCAG 2.1 algorithm. Evaluates pass/fail status for AA (4.5:1 / 3:1) and AAA (7:1 / 4.5:1) compliance across normal text, bold/large text, icons, and interactive form elements with color blindness simulation filters.
When should you use it?
Use this tool to ensure web applications and enterprise design systems meet accessibility guidelines (ADA, Section 508, EN 301 549), optimize button text readability, and verify brand color palettes before production deployment.
Key Capabilities & Features
Highlights
WCAG 2.1 and WCAG 3.0 (APCA) accessibility compliance auditing for text and background colors
Precise contrast ratio calculation with instant AA and AAA pass/fail badges for normal and large text
Interactive text preview showing real UI components at various font weights and sizes
Smart color suggestions automatically adjusting lightness to achieve WCAG compliance
Color blindness simulation preview for Protanopia, Deuteranopia, Tritanopia, and Achromatopsia