
What it costs
- Free tier
- Yes
Free, open-source (Color.js) WCAG contrast checker by OddBird; no paid tier.
Auto-checked on 8 August 2026Source
About OddContrast
What Is OddContrast?
OddContrast is a free color contrast checker designed for web designers and developers to evaluate accessibility between foreground and background colors. As a tool in the color tools category, OddContrast supports various color spaces and formats, enabling users to check contrast ratios against standards like WCAG during the design and development workflow. It helps ensure color combinations meet readability requirements without additional cost, fitting seamlessly into projects focused on inclusive design practices.
What OddContrast Does
- Calculates contrast ratios between two selected colors using WCAG guidelines.
- Supports input in sRGB formats such as hex, RGB, and others for both background and foreground colors.
- Handles unbounded color spaces, accommodating wider gamuts beyond standard sRGB.
- Allows swapping of background and foreground colors for quick ratio re-evaluation.
- Provides copy functionality for color values directly from input fields.
- Identifies known color issues, including gamut mapping and out-of-gamut warnings for modern CSS color features.
How OddContrast Can Be Used
- Designers input background and foreground colors to verify WCAG AA or AAA compliance for text elements, such as ensuring 4.5:1 ratios for regular text.
- Developers test color pairs during UI prototyping, swapping colors to explore alternatives that pass accessibility checks.
- Teams evaluate wide-gamut colors from CSS features like P3, checking for display inconsistencies across user screens.
- Accessibility auditors use it to scan combinations for non-text elements, confirming ratios like 3:1 for graphics.
- Workflow integration involves pasting color values from design software to assess real-time contrast before implementation.
Who Is OddContrast For?
OddContrast serves web designers, front-end developers, and accessibility specialists who need to validate color contrast in their projects. It suits beginners learning WCAG standards as well as experienced professionals working on design systems or responsive sites requiring cross-device color fidelity. Roles in UI/UX design, where color accessibility impacts user experience, benefit from its support for advanced color spaces. Product teams building compliant interfaces find it useful for quick checks without complex setups. Visit OddContrast
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