WCAG contrast checkers, ARIA references, readability scores, and accessibility testing tools.
Accessibility tools help you build web applications that work for everyone. This collection includes WCAG color contrast checkers, ARIA role and attribute references, readability score calculators, and testing utilities for common accessibility requirements. Use the contrast checker to verify your color combinations meet WCAG AA or AAA standards before shipping. The ARIA reference helps you apply the correct roles and attributes to custom interactive components. Readability scoring tools ensure your content is understandable by your target audience. Building accessible products isn't just compliance — it makes your software better for all users.
Popular in Accessibility
Check WCAG 2.1 color contrast ratios
Free online WCAG 2.1 contrast ratio checker. Test foreground and background color combinations against AA and AAA accessibility standards for normal and large text.
Searchable reference of all ARIA roles
Free online ARIA roles reference. Browse and search all WAI-ARIA roles organized by category with descriptions and usage guidelines for accessible web development.
Guide for writing effective alt text
Free online alt text writing guide and practice tool. Learn to write effective image alt text with examples of good and bad practices for web accessibility.
All Accessibility
Check WCAG 2.1 color contrast ratios
Searchable reference of all ARIA roles
Guide for writing effective alt text
Check HTML heading structure for proper nesting
Calculate readability scores for your text
Generate WCAG-compliant color palettes
Analyze link text for accessibility issues
Visualize tab/focus order of HTML elements
No browser-only tools in this category.
About Accessibility
WCAG contrast checkers, ARIA references, readability scores, and accessibility testing tools. All tools in this category run entirely in your browser with no server-side processing. Your data stays on your device.
Each tool is designed for speed and simplicity. Paste your input, configure options if needed, and copy the result with one click. No sign-up, no installation, no limitations.