Check text and background colour contrast before publishing.
Compare two colours and review common WCAG contrast thresholds. Accessibility also depends on typography, states, structure, keyboard access and content.
Tool entries are processed in your browser and are not intentionally uploaded to or stored by Kailvex. Do not enter passwords, payment-card details, patient information or other sensitive personal data.
Review the output before production use.
Designed to run in the browser
Tool inputs are not submitted to Kailvex through the utility interface.
Verify the result
Check outputs against current platform, legal, tax, accessibility and business requirements.
Results are informational
Generated code, previews and estimates do not guarantee rankings, compliance or commercial outcomes.
Custom implementation available
Kailvex can scope a reviewed implementation for a confirmed website, ecommerce or software project.
Important points before using this tool.
A ratio of at least 4.5:1 is a common WCAG AA threshold for normal text. Different requirements apply to large text and enhanced conformance.
No. Accessibility includes structure, keyboard navigation, focus order, labels, errors, motion, media alternatives and other factors.
Consider using the brand colour for larger elements while choosing an accessible text or background combination for readable content.
Free browser tool with transparent limitations.
Inputs are designed to be processed in your browser and are not intentionally stored by Kailvex. Do not enter passwords, payment credentials, patient data or other sensitive information. Results are informational starting points and must be independently reviewed before legal, tax, financial, accessibility, SEO, courier or production use.
Understand the workflow before using the result.
Read the practical Kailvex guide for WCAG Colour Contrast Ratio Checker. It covers who the tool is for, step-by-step use, a worked example, limitations, privacy and common questions.