NextTool

Palette Generator

How to use

Generates a set of matching colors from a single seed color using classic color-harmony rules, complementary, analogous, triadic, tetradic or monochromatic. Pick a color and a harmony rule to get a ready-to-use palette with hex codes.

Color & CSSLocal only

Seed Color & Harmony

#6366F1
#F1EE63
When to use this
  • Building a coordinated color scheme for a new brand or website from a single starting color
  • Finding an accent color that pairs well with an existing primary brand color
  • Generating a monochromatic scale for consistent button, badge, or tag states
  • Exploring color options for a design mockup before committing to a full style guide

Free and private. Everything runs on your own device, with no account and no uploads.

This tool generates a harmonious set of colors starting from a single seed color, using standard color theory rules like complementary, analogous, triadic, tetradic, and monochromatic harmonies. It is useful for quickly building a coordinated color scheme for a design project without manually calculating hue rotations. Every palette is computed in your browser using HSL math, with one-click copy for each generated swatch.

You can choose complementary, analogous, triadic, tetradic, or monochromatic color harmony based on your seed color.

The seed color is converted to HSL, then new colors are generated by rotating the hue (or adjusting lightness for monochromatic) according to the selected harmony rule.

No, all palette generation happens locally in your browser using JavaScript color math.

The palette is not saved automatically; copy the individual HEX codes you want to keep for later use.

Yes, for example complementary gives two colors, triadic gives three, tetradic gives four, and monochromatic gives five shades of the same hue.

How it works
  1. 1

    Pick a seed color

    Choose a starting color using the color picker or HEX input.

  2. 2

    Select a harmony rule

    Pick complementary, analogous, triadic, tetradic, or monochromatic.

  3. 3

    Review the generated swatches

    See the resulting palette of coordinated colors.

  4. 4

    Copy any swatch

    Click the copy icon on a swatch to grab its HEX code.

More in Color & CSS
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Gradient Generator
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Contrast Checker
Check WCAG AA/AAA contrast ratio between text and background colors
Read about this
Gradients and palettes: why yours goes grey in the middle4 minColour contrast: what the WCAG numbers mean and how to hit them3 min
Pro tips
  • ·Try monochromatic first if you want a safe, cohesive look before experimenting with complementary or triadic contrast.
  • ·Run generated colors through the Contrast Checker before pairing them as text and background to confirm they're readable.
  • ·Copy swatches you like immediately since palettes aren't saved once you navigate away.