Complementary Palette Generator

Generate complementary color palettes from any base color. Opposite-hue pairs deliver the strongest possible visual contrast — ideal for CTAs, highlights and bold design systems.

Base Color (HEX)

Colors

CSS Variables

What Is a Complementary Palette?

A complementary palette is built around a pair of colors that sit opposite each other on the color wheel — 180° apart in hue. Blue and orange, red and green, yellow and purple. Because they share no hue, complementary pairs create maximum visual tension and pop, making them ideal for drawing attention to key elements.

OmniColor's complementary palette generator takes your base color, finds its exact complement, and builds a five-color palette that supports the pair with coordinated tints and shades.

How It Works

The generator computes the complement using HSL hue rotation: (baseHue + 180) % 360. It then adds three supporting colors by varying the lightness of the base hue, keeping the palette balanced and usable.

Base: #155EEF (hue 215°, saturation 84%, lightness 51%)
Complement: hue (215 + 180) % 360 = 35° → orange
Palette:
  1. Base   hsl(215, 84%, 51%)  → #155EEF
  2. Complement hue 35°         → orange
  3. Base darker                → deep blue
  4. Base lighter               → soft blue
  5. Base mid-tone              → medium blue

When to Use Complementary Palettes

Call-to-action buttons: Pair a brand color with its complement so the CTA pops.
Sports and gaming brands: High-tension pairings create memorable identities.
Editorial highlights: Pull quotes and alerts stand out instantly.
Attention-grabbing packaging: Complementary pairs stop the eye on shelf.

Best Practices

Use complementary colors intentionally. The base color should dominate (about 60–70% of the design), and the complement should be reserved for accents (5–15%). Two complementary colors used in equal amounts create visual vibration that is exhausting rather than impactful. Always test contrast with our contrast checker before shipping.