Complementary Color Finder
Find the complementary color of any given color instantly. Use complementary pairs to create high-contrast, visually dynamic designs.
#3B82F6
RGB(59, 130, 246) • HSL(217°, 91%, 60%)
Base Color
RGB(59, 130, 246) • HSL(217°, 91%, 60%)
Complementary
RGB(246, 175, 60) • HSL(37°, 91%, 60%)
When to Use Complementary Colors
- Create high contrast and visual interest
- Draw attention to important elements
- Create dynamic and vibrant designs
- Use in small doses to avoid overwhelming
Base
RGB(59, 130, 246) • HSL(217°, 91%, 60%)
+30°
RGB(82, 60, 246) • HSL(247°, 91%, 60%)
-30°
RGB(175, 60, 246) • HSL(277°, 91%, 60%)
Base
RGB(59, 130, 246) • HSL(217°, 91%, 60%)
+120°
RGB(246, 60, 131) • HSL(337°, 91%, 60%)
+240°
RGB(131, 246, 60) • HSL(97°, 91%, 60%)
Base
RGB(59, 130, 246) • HSL(217°, 91%, 60%)
+150°
RGB(246, 82, 60) • HSL(7°, 91%, 60%)
+210°
RGB(224, 246, 60) • HSL(67°, 91%, 60%)
What Is a Complementary Color?
A complementary color sits directly opposite another color on the color wheel — exactly 180 degrees apart. This creates maximum contrast and visual tension. Red complements green, blue complements orange, yellow complements purple.
How the Finder Works
The tool converts your input color to HSL, adds 180 to the hue value (wrapping around at 360), and converts back to display formats. It also calculates analogous colors (±30 degrees) and triadic colors (±120 degrees) for additional options.
For example, if your base is hsl(217, 91%, 60%) — a blue — the complement is hsl(37, 91%, 60%) — an orange.
When to Use Complementary Colors
Call-to-Action Buttons
Your site is mostly blue. An orange CTA button (blue's complement) will stand out more than any other color. The contrast draws the eye naturally.
Highlighting Important Elements
Error messages in red pop against a green success indicator. Warning icons in orange stand out against blue interfaces. Complementary colors create instant visual hierarchy.
Sports Team Branding
Many sports teams use complementary colors for their uniforms and logos. The high contrast looks dynamic on TV and makes the team instantly recognizable.
Creating Visual Energy
A poster for a music festival uses purple and yellow throughout. The complementary tension feels energetic and exciting — perfect for the event's vibe.
Using Complementary Colors Without Overwhelming
Use one as the dominant color. If your design is 80% blue and 20% orange, it feels balanced. At 50/50, it feels chaotic and competing.
Adjust saturation for subtlety. A muted orange (like terracotta) complements blue without screaming. Lower saturation reduces visual tension while keeping the relationship.
Try split complementary instead. Use your base color plus the two colors adjacent to its complement. You get variety with less direct tension.
Consider lightness differences. A dark blue with a light orange (or vice versa) adds contrast in both hue and value, making the combination more readable.
Frequently Asked Questions
Why does my complement look wrong?
The mathematical complement is always 180° apart, but perceptual complement (what looks opposite) can vary based on context, surrounding colors, and individual vision. Trust your eyes over the formula.
Can complementary colors be accessible?
Yes, but check the contrast ratio. Complementary colors can have similar lightness, resulting in poor contrast. Use our Contrast Checker to verify text-background combinations meet WCAG standards.
What about red-green color blindness?
Red and green are complements, but they're indistinguishable for many people with red-green color blindness. Don't rely solely on this pair to convey information — add labels, icons, or patterns.
How is this different from the Color Harmony Generator?
This tool focuses specifically on complementary colors plus analogous and triadic options. The Harmony Generator offers more harmony types (tetradic, square, split) with export functionality.
Can I use complements for text and background?
Yes, but ensure sufficient lightness contrast. A dark blue background with light orange text can work well. Two medium-lightness complements might fail accessibility requirements.
What are analogous colors?
Analogous colors sit next to your base color on the wheel (±30°). They share similar undertones and create harmonious, low-contrast palettes. Blue, blue-green, and green are analogous.
Common Complementary Pairs
Red ↔ Green
0° ↔ 120°
Orange ↔ Blue
30° ↔ 210°
Yellow ↔ Purple
60° ↔ 240°
Yellow-Green ↔ Red-Purple
90° ↔ 270°
Green ↔ Magenta
120° ↔ 300°
Blue-Green ↔ Red-Orange
150° ↔ 330°
Other Free Color Tools
Color Harmony Generator
Generate complementary, analogous, triadic, and tetradic color palettes based on color theory. Build harmonious color schemes for any design project.
Interactive Color Wheel
Explore an interactive color wheel to visualize relationships between colors. Understand hue, saturation, and how colors interact for better design decisions.
Color Contrast Checker — WCAG Compliance
Check the contrast ratio between text and background colors against WCAG AA and AAA accessibility standards. Ensure your designs are readable for all users.
Text Color Suggestion Tool
Enter a background color and get instant suggestions for readable, accessible text colors. Designed to help you meet contrast requirements effortlessly.
Color Picker
Pick any color using an interactive palette or enter HEX, RGB, or HSL values. Copy your color code instantly for use in any design or development project.
Color Palette Generator from Base Color
Generate a beautiful, harmonious color palette from a single base color. Perfect for building consistent UI color schemes and brand identities.