Accessibility Checker — WCAG 2.1 Contrast
Check color contrast for WCAG 2.1 AA/AAA compliance. See live preview with sample UI, get suggested accessible alternatives if your colors fail, and copy the result.
Accessibility Checker
WCAG 2.1 AA / AAA contrast compliance for any color pair.
How to use this tool
1. Enter your input. Use the form above — all processing happens in your browser, no data is sent to any server.
2. View the result. The output appears instantly below the input. Copy any value with one click.
3. Explore related tools. See the related tools section below for adjacent calculators and converters.
4. Bookmark this page. This tool runs entirely client-side, so it works offline once loaded. Add it to your bookmarks for quick access.
Frequently Asked Questions
Everything you need to know about this currency pair
WCAG 2.1 (Web Content Accessibility Guidelines) defines contrast ratios: AA requires 4.5:1 for normal text, 3:1 for large text (18pt+ or 14pt bold). AAA requires 7:1 for normal text, 4.5:1 for large. UI components (icons, form borders) need 3:1. Failure makes content unreadable for users with low vision or color blindness.