When you visit a website, you expect to read the text effortlessly. But for millions of people with visual impairments, low vision, or color blindness, poor color choices can make a website invisible or painful to read. A Color Contrast Checker is the essential tool that ensures your digital content is readable by everyone, regardless of their visual ability. It doesn't just "check colors." It mathematically calculates the difference in light perception between two colors (foreground text and background) to verify if they meet global accessibility standards like WCAG (Web Content Accessibility Guidelines) and ADA (Americans with Disabilities Act) compliance. Whether you are a designer aiming for aesthetic beauty, a developer ensuring code compliance, or a business owner avoiding lawsuits, understanding color contrast is non-negotiable. This guide explains exactly how contrast works, the strict mathematical standards you must meet, and how to use a checker correctly to bui...