{"generatedAt":"2026-07-19T03:01:59.643Z","tool":{"id":"color-contrast-checker","name":"Color Contrast Checker","description":"Check WCAG 2.1 color contrast ratios between foreground and background colors. Shows AA/AAA pass/fail for normal and large text.","category":"devtools","icon":"◐◑","keywords":["wcag","contrast","accessibility","a11y","color","aa","aaa","checker","ratio"],"isNew":true,"remoteCallable":true,"remoteMode":"dedicated_api","riskClass":"L","maxInputBytes":131072,"timeoutMs":2000,"supportsStreaming":false,"url":"/color-contrast-checker/","tags":["devtools"],"faqs":[{"question":"What is WCAG 2.1 contrast ratio?","answer":"WCAG 2.1 (Web Content Accessibility Guidelines) defines contrast ratios between foreground and background colors. Higher ratios indicate better readability for people with color blindness or low vision. AA requires 4.5:1 for normal text, 3:1 for large text. AAA requires 7:1 and 4.5:1 respectively."},{"question":"Why is AA compliance important?","answer":"AA compliance is the minimum standard for accessible web design. It ensures text is readable for users with moderate vision impairment. Many organizations and countries require AA compliance by law. AAA is the enhanced standard for maximum accessibility."},{"question":"What color formats does the checker support?","answer":"The Color Contrast Checker supports hex (#RRGGBB or #RGB), RGB (rgb(r, g, b)), and HSL (hsl(h, s%, l%)) formats. You can also use the color picker for visual selection. All formats are automatically converted to RGB for luminance calculation."},{"question":"Can I check contrast for different text sizes?","answer":"Yes. The tool shows separate pass/fail results for normal text (requires higher contrast) and large text (18pt+, requires lower contrast). This allows you to use lower contrast ratios for larger, more readable text while maintaining standards for smaller text."},{"question":"Is this tool free and does it store my data?","answer":"Yes. Free to use. Processing happens directly in your browser. Colors are not sent to external servers or stored anywhere. The tool is entirely client-side with no backend dependencies."}],"howTo":[{"title":"Enter foreground and background colors","description":"Use the color pickers or paste color values in hex (#RRGGBB), RGB (rgb(r,g,b)), or HSL (hsl(h,s%,l%)) format. The live preview updates instantly."},{"title":"Check WCAG compliance levels","description":"Review the contrast ratio and AA/AAA badges for both normal and large text. Green checkmarks mean pass, red X means fail. Use this to validate your color scheme meets accessibility standards."},{"title":"Compare text readability","description":"See how your chosen colors look with real sample text in the preview. Adjust colors until you achieve the contrast level you need—AA (4.5:1) for legal compliance, AAA (7:1) for maximum accessibility."},{"title":"Swap colors to test both directions","description":"Use the Swap control to test if the inverse color combination (light text on dark background vs dark on light) also meets your contrast needs. Useful for multi-variant designs."},{"title":"Copy ratio and integrate","description":"Once you find compliant colors, copy the ratio to clipboard and apply the color codes in your CSS, design tool, or style guide documentation."}],"agentContract":{"toolId":"color-contrast-checker","contractVersion":"2.0.0","remote_callable":true,"remote_mode":"dedicated_api","risk_class":"L","max_input_bytes":131072,"timeout_ms":2000,"supports_streaming":false,"preferred_surface":"dedicated_api","dedicated_api":{"baseUrl":"https://aidevhub.io/api/color-contrast-checker/","openapiUrl":"https://aidevhub.io/api/openapi.yaml","endpoints":[{"method":"GET","path":"/api/color-contrast-checker/","summary":"GET color-contrast-checker"},{"method":"POST","path":"/api/color-contrast-checker/","summary":"POST color-contrast-checker"}],"riskClass":"L","inputMaxBytes":131072,"timeoutMs":2000},"runtime":{"endpoint":"/api/tools/run/","methods":["GET","POST"],"queryParams":[{"name":"toolId","required":true,"description":"Tool identifier"},{"name":"a","required":true,"description":"Primary input"}],"postBodyShape":{"toolId":"string","input":"{ a, b?, c?, mode? }"},"exampleGet":"https://aidevhub.io/api/tools/run/?toolId=color-contrast-checker&a=...","policy":{"riskClass":"L","limit":60,"burst":20,"windowSec":60,"inputMaxBytes":131072,"timeoutMs":2000,"cacheTtlSec":0,"networkEnabled":false,"supportsStreaming":false}}},"relatedTools":[{"id":"color-palette-generator","name":"Color Palette Generator","url":"/color-palette-generator/","category":"generator"},{"id":"cli-ux-linter","name":"CLI UX Linter","url":"/cli-ux-linter/","category":"devtools"},{"id":"ai-cli-generator","name":"AI CLI Generator","url":"/ai-cli-generator/","category":"devtools"},{"id":"csv-endpoint-builder","name":"CSV Endpoint Builder","url":"/csv-endpoint-builder/","category":"devtools"},{"id":"openprose-flow-linter","name":"OpenProse Flow Linter","url":"/openprose-flow-linter/","category":"devtools"},{"id":"trace-context-validator","name":"Trace Context Validator","url":"/trace-context-validator/","category":"devtools"}]}}