Understanding color across screen and print
Color rarely lives in a single space. A brand color born on a designer's screen as RGB has to survive translation into a HEX string for the website, a CMYK mix for the printed brochure, and a Pantone spot color for the packaging - all while staying recognisably the same. That translation is exactly what this collection of tools handles, so a value you pick once stays consistent everywhere it appears.
Each model answers a different question. RGB and HEX describe light being added on a screen, which is why they can produce vivid, glowing hues. CMYK describes ink being layered on paper, a subtractive process that can't reach every on-screen color - knowing that limit before you send a file to print saves expensive surprises. HSV and HSL, meanwhile, separate the hue from its saturation and brightness, which makes them the friendliest spaces for adjusting a color by feel rather than by number.
Designing for contrast and accessibility
A color choice is only finished when people can actually read it. The Web Content Accessibility Guidelines (WCAG) express legibility as a contrast ratio between text and its background: 4.5:1 for standard body text to reach the AA level, and 7:1 for the stricter AAA level. The contrast tools here compute that ratio for you and flag pairings that fall short, while the color-blindness simulators show how a layout reads for the roughly one in twelve men and one in two hundred women who experience color-vision deficiency.
