Contrast Validator
Ensure your interface is inclusive and readable. Calibrate color pairs against WCAG 2.1 precision standards.
Spectral Legibility
Real-time simulation of your chroma selections. High-precision distribution ensures readability for everyone.
Color alone is insufficient for communication. Deploy icons, textures, or text labels to ensure users with spectral vision variances can successfully navigate your interface logic.
WCAG Engine
Validated against WCAG 2.1 AA and AAA standards to ensure your web architecture remains legally compliant and inclusive.
Live Feedback
Watch the ratio and compliance status update in real-time as you recalibrate colors or type in hex coordinates.
Surface Mockup
Interact with a live UI viewport that follows your palette choices, providing an immediate sense of legibility.
Built With Care
“WCAG 2.1 requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text at Level AA. This tool calculates relative luminance using the sRGB color space formula specified in the W3C guidelines for accurate compliance testing.”
Principles of Accessible Chroma
Check the contrast ratio between foreground and background colors against WCAG 2.1 AA and AAA standards. See pass/fail results for normal and large text in real time.
- 1Initialize the 'Foreground Chroma' by selecting a color or typing a HEX code.
- 2Define the 'Background Surface' color to create your testing pair.
- 3Observe the 'Luminance Ratio' - 4.5:1 is the target for standard text (Level AA).
- 4Audit the 'Status Matrix' to see compliance for both standard and oversized text.
- 5Interact with the 'Interface Sample' to visually verify legibility in a real-world context.
- 6Adjust colors iteratively until all compliance checkboxes reach an active state.
- WCAG 2.1 Compliance Logic: Precise luminance calculation for AA and AAA levels.
- Dual-State Validation: Separate testing for normal (body) and large (heading) typography.
- Interactive UI Viewport: High-fidelity simulation of color pairs on a realistic interface component.
- HEX Coordinate Sync: Two-way binding between color pickers and manual hex inputs.
- Accessibility Intelligence: Integrated tips for designing beyond standard color contrast.
Real Ways People Use This
Website Accessibility Audit
Test your brand colors against WCAG standards before launching to ensure legal compliance.
UI Component Design
Verify button text, form labels, and navigation links meet minimum contrast thresholds.
Email Template Testing
Ensure text in HTML emails remains readable across different email clients and dark mode.
Brand Color Selection
Choose primary and secondary brand colors that automatically pass accessibility checks.
- This tool tests the final hex color only — transparent overlays blend with whatever is behind them and may reduce effective contrast.
- WCAG contrast is a starting point; users with low vision may still struggle with certain color combinations even at AAA level.
- 1Enter your text color and background color as HEX values.
- 2Confirm both normal text and large text show green checkmarks for Level AA.
- 3Test the live preview to verify readability in a realistic UI context.