Contrast Checker
Analyze and perfect your website's color accessibility using the Heurilens WCAG 2.1 compliant analyzer. Ensure maximum text readability and A11y compliance instantly.
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Detailed Analysis
Normal Text (AA)FAIL
Large Text / UI (AA)FAIL
Elite Standard (AAA)FAIL
Real-world
Interface Preview.
Visualize how your selected colors translate to a real website layout.
Why Color Contrast Matters for Your UX & SEO
Accessibility is a fundamental requirement for digital experiences. A WCAG color contrast checker helps bridge the gap between design and inclusivity. Low contrast alienates users and increases cognitive load.
Legal Compliance
Meet ADA, Section 508, and EAA requirements by following WCAG 2.1 guidelines.
SEO Advantage
Google's algorithms prioritize accessible sites for better Core Web Vitals.
Understanding WCAG 2.1 Standards
The World Wide Web Consortium (W3C) established guidelines to ensure consistency across the web. We focus on three primary thresholds:
- Level AA (Standard): 4.5:1 for normal text, 3:1 for large. Global benchmark for commercial sites.
- Level AAA (Elite): 7:1 for normal text, 4.5:1 for large. Ideal for gov and healthcare.
- UI & Graphics: Interactive elements must maintain a 3:1 ratio against adjacent colors.
Contrast on Images and Gradients
Placing text over images is a common UX trap. Heurilens recommends:
Semi-transparent Overlays
Add dark or light overlays to normalize the background luminance levels.
Strategic Text Shadows
Use subtle CSS shadows to create edge definition against complex textures.
Common Questions
What is a color contrast ratio?
A contrast ratio is a numerical value (from 1:1 to 21:1) that represents the difference in light-perceived luminance between two colors.
Can I use this tool for brand identity design?
Yes! Designing an accessible brand starts with your core colors. This tool helps you validate brand inclusivity from day one.
What's the difference between AA and AAA?
AA is the standard legal requirement (4.5:1 ratio). AAA is an enhanced standard (7:1 ratio) for users with more severe visual impairments.
Why should I use Heurilens instead of a manual checker?
Heurilens AI can scan your entire live website, identifying every single contrast violation automatically in seconds.
Do interactive elements like buttons need contrast checks?
Absolutely. Under WCAG 2.1, all graphical objects and UI components must have a minimum ratio of 3:1.