What AI says about WebAIM Contrast Checker

WebAIM's Contrast Checker is a web-based tool that lets you specify foreground and background colors (via hex, color picker, and optional alpha) to compute the color contrast ratio. It shows WCAG compliance results (AA and AAA) for normal text and large text, with explanations of required ratios across WCAG 2.0/2.1 and for graphics/UI components. The tool also provides a permalink-based API that returns JSON with contrast data, and a bookmarklet for testing contrast directly within any page.