Color Accessibility Tester
The Color Accessibility Tester lets you instantly check the contrast between text and background colors and verify compliance with WCAG AA and AAA guidelines. It also offers accessibility suggestions and simulates how your color combinations appear to users with various forms of color blindness.
How to Use This Tool
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The Color Accessibility Tester Tool helps designers, developers, and accessibility specialists evaluate whether text and background color combinations meet WCAG contrast ratio guidelines. Start by choosing your foreground color (text) and background color using the color picker or by entering a HEX code. For quick testing, use preset options like Black on White, White on Black, Blue on White, or Yellow on Black. The tool instantly calculates the contrast ratio, luminance difference, and color brightness levels for your selected combination.
Next, explore the testing options to refine your results. Adjust font size, font weight, and test text to simulate real-world scenarios. Enable large text preview, graphics preview, or color-blind simulation to see how your design looks for users with different visual abilities. The live preview panel demonstrates how your chosen colors appear in buttons, links, cards, and input fields, making it easier to identify accessibility issues early in the design process.
Finally, check the WCAG compliance results, which show whether your color choices pass AA or AAA standards for normal text, large text, and graphics. Use the detailed analysis to review luminance ratios, brightness differences, and accessibility scores. If your combination fails, swap or randomize colors until you find one that meets the requirements. With this tool, you can create accessible, user-friendly, and inclusive interfaces that improve readability and meet global accessibility standards.
Use Cases
- Ensure text is legible according to WCAG guidelines.
- Improve accessibility in branding, UI, and web content.
- Simulate color combinations for users with color vision deficiencies.
- Quickly adjust colors using built-in improvement suggestions.
Key Features
WCAG Contrast Checking
Calculates the contrast ratio and checks for AA (4.5:1) and AAA (7:1) compliance.
Color Blindness Simulation
Simulates how colors appear with Protanopia, Deuteranopia, Tritanopia, and Achromatopsia.
Live Color Preview
Shows your color combination on sample text, buttons, and form elements.
Detailed Feedback & Suggestions
Provides specific reasons for failure and suggests lighter/darker adjustments.
Color Code Output
Provides accessible color values in HEX, RGB, and HSL formats for easy implementation.
Frequently Asked Questions
The tool checks against the WCAG 2.1 guidelines for contrast (Success Criterion 1.4.3). It evaluates for both Level AA (minimum contrast ratio of 4.5:1 for normal text) and Level AAA (enhanced contrast ratio of 7:1 for normal text).
The simulations use widely accepted algorithms to approximate how someone with a specific color vision deficiency might perceive the color combination. While it is a close approximation, it cannot perfectly represent every individual's experience.
No. All processing happens locally in your browser. Your color choices are not sent to any server or stored in a database, ensuring your design choices remain private.
Yes. While this tool provides color pickers, you can manually input HEX, RGB, or HSL values from your website's style guide to test them. Some browser extensions can also extract colors directly from a live page.
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👨💻 About the Developer
Muhammad Abid Rahimi
Professional full-stack developer with expertise in creating high-performance web applications and tools. Specializing in PHP, MySQL, JavaScript, and modern web technologies. Passionate about building user-friendly interfaces and scalable backend systems that deliver exceptional user experiences.