Color Palette Generator — Build Harmonious Color Schemes Instantly
Pick any base color and generate a complete, mathematically harmonious palette in one click. Choose from five color harmony rules — Analogous, Monochromatic, Complementary, Triadic, or Tetradic — fine-tune with saturation and luminance sliders, then export as CSS custom properties or JSON. Everything runs in your browser with no upload required.
Whether you're building a design system, picking brand colors, or exploring color combinations for a UI, this tool turns a single hex code into a production-ready palette in seconds.
How to Generate a Color Palette
- Pick your base color — click the color swatch to open the native color picker, or type a hex code directly into the input field (e.g.
197FE6). - Choose a harmony rule — select Analogous, Monochromatic, Complementary, Triadic, or Tetradic from the panel. The palette updates instantly.
- Refine with sliders — use the Saturation and Luminance sliders to adjust the mood and contrast of the entire palette at once.
- Regenerate for inspiration — click Regenerate to randomize the base hue while keeping your harmony rule and refinement settings.
- Export — click any swatch to copy its HEX code, or use the Export bar to copy CSS variables, JSON, or download a PNG card.
Color Harmony Rules Explained
Analogous — uses hues adjacent on the color wheel (±30° and ±60° from the base). Results in palettes that feel cohesive and natural, like colors found in nature or a sunset. Ideal for UI backgrounds, illustration, and organic brand identities.
Monochromatic — keeps the same hue but varies lightness across five steps (from near-white to near-black). This is the safest choice for dark/light mode UI themes, accessibility-focused design, and anywhere you need subtle variation without clash.
Complementary — pairs your base with the color directly opposite (180°) on the wheel, plus nearby accent shades. Creates high-contrast, energetic combinations. Common in sports branding and call-to-action design.
Triadic — splits the wheel into three equal 120° segments. Produces vibrant, balanced palettes that are harder to misuse than complementary. Often seen in children's products, creative agencies, and editorial design.
Tetradic (Square) — uses four hues spaced 90° apart, plus an accent. The richest harmony in this tool — gives you the most color variety, but requires care to keep one color dominant and the rest supporting.
Common Use Cases
- UI Design Systems: Generate a 5-color palette from your brand's primary color. Export directly as CSS custom properties and use in your component library. The CSS output is compatible with Tailwind v4, vanilla CSS, and any modern framework.
- Brand Identity: Explore analogous and complementary harmonies from your logo's main color to find secondary palette options for marketing materials and digital assets.
- Dark Mode Theming: Use the Monochromatic rule with a low Luminance value to build the surface, background, and muted layers of a dark theme systematically.
- Rapid Prototyping: Regenerate until you land on an interesting combination, then lock it by copying the HEX codes or CSS block. History stores your last 10 generations so you can go back.
- Design Token Pipelines: The JSON export includes HEX, RGB, and HSL data for each color with its semantic label (e.g.
PRIMARY BASE,ANALOGOUS L). Feed this directly into Style Dictionary or your token build step.
Frequently Asked Questions
What is color harmony and why does it matter?
Color harmony is the use of mathematically defined relationships between hues on the color wheel to create palettes that feel balanced and intentional. Harmonious palettes are easier for viewers to process and look professional without requiring a designer's intuition. Tools like this apply proven geometric rules (analogous adjacency, complementary opposition, triadic split) to produce starting points that work — and that you can then refine to taste.
How is this different from picking colors manually?
Manual color selection requires either experience or significant trial and error. Harmony-based generation gives you a mathematically sound starting point in one click. You still control the base hue, saturation, and luminance — the algorithm handles the relationships between the five generated colors. Think of it as having a color theory rule applied automatically while you focus on mood and context.
What is the difference between analogous and monochromatic?
Analogous palettes vary the hue in small steps around the base color (neighbor colors on the wheel), keeping saturation and lightness constant. Monochromatic palettes keep the same hue and only vary lightness — from light tints to dark shades. Analogous feels more colorful and lively; monochromatic feels more unified and minimal.
How do the Saturation and Luminance sliders work?
They apply globally to all generated colors at once. Saturation (0–100%) controls color intensity — 0% gives pure grays, 100% gives the most vivid version. Luminance (5–95%) controls brightness — low values produce dark, rich colors; high values produce light, washed-out pastels. The sliders let you move an entire harmony from "vibrant daytime UI" to "dark mode accessible" without changing the harmonic relationships.
Can I save palettes I like?
Click Regenerate before changing anything — the current palette is automatically saved to History (up to 10 entries). Open History at any time to reload a previous combination. For permanent storage, copy the CSS variables or JSON export and paste it into your project files.
How many colors does each palette contain?
All harmony types generate exactly 5 colors. This is a deliberate choice: most design systems define 5 semantic roles for a palette (primary, secondary/accent, neutral, surface, dark/light variant), and 5 distinct colors is the sweet spot between variety and cohesion for most UI work.
What formats can I export to?
CSS Variables — a :root {} block with semantic variable names ready to paste into any web project. JSON — a machine-readable array with hex, RGB, and HSL values plus the semantic label for each color. PNG — a clean swatch card with color blocks and hex labels, ready to share in Figma, Slack, or a brand brief.
Resources
- MDN — CSS Custom Properties — How to use the CSS variables generated by this tool in your web projects.
- Wikipedia — Color Harmony — Overview of color theory and the geometric harmony rules this tool implements.
- DESIGN.md Specification — Open-source standard for machine-readable design system files, compatible with Claude Code and other AI coding assistants.
