Contrast calculator

Color contrast is the perceived difference between two colors when they are seen side by side. It describes how easily one color can be distinguished from another, and it is a key concept in visual perception, design, and accessibility. High contrast means colors stand out strongly from each other (for example, black text on a white background), while low contrast means colors blend together more softly. Human vision is highly sensitive to contrast because it helps the brain detect edges, shapes, depth, and structure in visual scenes. In practice, contrast is what makes text readable, objects separable, and compositions visually organized.
You can find more details about color contrast here.