Explore Colors.
Create Beautiful Designs.

Color is the fastest way a design communicates meaning. A single shade of blue can read as trust, calm, technology, or coldness depending on context. OmniColor exists because the process of choosing, converting, and validating color should be fast, accurate, and free — for everyone, on every device, without a login.

Every one of our tools runs entirely in your browser using the Canvas API, the Clipboard API, and standards-based color mathematics (sRGB, HSL, HSV, CMYK, WCAG 2.2). That means your images, palette ideas, and design files never leave your device. There are no uploads, no tracking of your color choices, and no paywalls.

Built for Real Design Workflows

Whether you are a UI designer building a design system, a developer converting legacy HEX values to CSS variables, a marketer extracting brand colors from a logo, or a student learning color theory for the first time, OmniColor meets you where you are. Our pickers support HEX, RGB, HSL, HSV, CMYK and alpha transparency. Our palette generators produce export-ready tokens. Our gradients output valid CSS that works in every modern browser. Our contrast checker reports exact WCAG AA and AAA results so your text is always readable.

We also believe color education matters as much as color tooling. That is why every tool page includes genuine explanations of the underlying concepts, step-by-step instructions, real examples, use cases, and FAQs — not empty filler content.

The Three Properties of Any Color

Every color you see on a screen can be described by three properties: hue, saturation, and lightness (or value). Hue is the position on the color wheel — red at 0°, green at 120°, blue at 240°. Saturation is intensity, from grey (0%) to vivid (100%). Lightness moves the color from black (0%) through the pure hue (50%) to white (100%). Adjusting these three values is how you create tints, shades and tones with precision.

Color Harmony: Six Professional Schemes

Complementary pairs sit opposite each other on the color wheel (blue and orange). They create maximum contrast and visual tension — perfect for calls-to-action. Analogous colors are neighbors (blue, blue-green, green) and create calm, cohesive interfaces. Triadic trios are evenly spaced (red, yellow, blue) and feel balanced yet vibrant. Tetradic schemes use four colors in two complementary pairs, offering variety while maintaining balance. Split-complementary replaces one color of a complementary pair with its two neighbors — softer contrast than pure complementary. Monochromatic uses one hue in many tints and shades for elegant, restrained design.

Color Formats You Need to Know

HEX codes (#155EEF) are six hex digits — two each for red, green, blue. They are compact and the default in HTML and CSS. RGB uses three integers (0–255) and is common in JavaScript and canvas work. HSL describes color as hue, saturation, lightness — more intuitive to adjust and the basis for most palette generators. HSV replaces lightness with value, common in color pickers. CMYK is subtractive and used exclusively for print. OmniColor's converters preserve precision across all five formats so nothing is lost as you move between them.

Accessibility Is Not Optional

WCAG 2.2 requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text (18pt+ or 14pt bold) to meet Level AA. Level AAA requires 7:1 and 4.5:1 respectively. OmniColor's contrast checker computes the exact ratio using the WCAG relative luminance formula, so you can trust the result. Many beautiful color combinations fail accessibility tests — our tool catches this before you ship.

Use the tools above — or explore the full color theory library — to build a working understanding that will serve you in every project.