What is a split-complementary color scheme?

A split-complementary palette uses the base color plus the two colors adjacent to its complement (150° and 210°), offering high contrast with less visual tension.

Can I use complementary colors for text on a background?

Not always directly; full-saturation complementary pairs can cause uncomfortable visual vibration (chromostereopsis). Adjust lightness or saturation to meet WCAG contrast.

How are complementary colors used in web design?

Websites commonly use a dominant brand color (e.g., deep blue) and reserve its complement (bright orange) exclusively for high-converting Call-to-Action (CTA) buttons.

Color Tools• 180° Harmony

Complementary Color Generator (Opposite Wheel Harmony)

Complementary colors sit directly opposite each other on the 360° color wheel. When paired, they create the highest possible visual contrast and vibrant energy for CTA buttons, logos, and art.

Calculations run client-side. Zero color telemetry.

Base Color (HEX)

RGB: 59, 130, 246

HSL: 217°, 91%, 60%

Base Color

#3B82F6

180° Complement

#F6AF3C

Split-Complementary Harmonies

#F6523C(150° split)

#E0F63C(210° split)

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How to Use Complementary Color Generator

Select Base Color

Input any Hex, RGB, or HSL color or use the color wheel.

View Complementary Pair

Inspect the exact (Hue + 180°) opposite color swatch and split-complementary variants.

Copy Codes

One-click copy Hex, RGB, or HSL values directly to your CSS.

About Complementary Color Generator

Converts input to HSL color space, shifts hue by 180 degrees modulo 360 while preserving saturation and lightness, then converts back to standard sRGB hex notation.

Supported Formats

HEXRGBHSL

Operational Limits

•Calculations use the standard 360° sRGB color wheel model.

Key Features

Exact mathematical 180° color wheel opposite calculation: (H + 180) % 360
Split-complementary harmony generation (Hue + 150° and Hue + 210°)
Interactive UI mockup preview showing button and card contrast
Calculates WCAG contrast ratio between the complementary pair
One-click copy for HEX, RGB, HSL, and CSS custom properties

Frequently Asked Questions

Complementary colors are pairs of colors which, when placed next to each other, create the strongest contrast (e.g. blue and orange, red and green, purple and yellow).

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