Accessible Color Contrast Checker

The Accessible Color Contrast Checker by ToolsInFree is a free, fast, and user-friendly tool designed to help designers and developers create inclusive, accessible, and WCAG-compliant websites. Proper color contrast isn’t just a best practice—it’s a legal and ethical requirement that ensures people with low vision, color blindness, or those browsing in bright environments can read and interact with web content comfortably.

I built this tool to simplify the process of validating and refining color contrast. Many designers rely on trial and error or multiple external tools, so I wanted to create a single, streamlined solution that offers instant results and advanced features—without paywalls, limits, or sign-ups.

The tool allows users to:

• Enter foreground and background colors in hex format

• Adjust the alpha (transparency) level for advanced layered-color testing

• Instantly check WCAG AA and AAA compliance for normal and large text

• Evaluate non-text contrast requirements (WCAG 2.1)

• Use a lightness slider to fine-tune color shades until they meet contrast requirements

It’s especially useful for:

• UI/UX designers

• Web developers

• Accessibility testers

• Product teams

• Anyone who wants to ensure their website is readable and inclusive

By meeting WCAG 2.1 contrast ratios—4.5:1 for normal text, 3:1 for large text, and 3:1 for UI components—you improve readability, usability, compliance, and user satisfaction.