Contrast Ratio Checker is a free Chrome extension developed by Vinícius R. Vieira. It is a powerful tool that allows users to easily check the contrast ratio between colors on their websites.

With this extension, users can ensure that their website meets the Web Content Accessibility Guidelines (WCAG) by calculating the contrast ratio between text and background colors. It offers validators based on WCAG AA (minimum), WCAG AAA (enhanced), and even allows users to set their own custom ratio.

By using Contrast Ratio Checker, website owners and developers can improve the accessibility of their websites, making them more inclusive and user-friendly for individuals with visual impairments. This extension is an invaluable resource for anyone looking to create accessible websites.