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Color Palette Generator

Generate harmonious color palettes from a base color for websites, apps, branding, and UI systems. Choose a harmony type, preview the palette instantly, and copy HEX, RGB, or HSL values for any swatch.

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Color Palette Generator — Create Harmonious Color Schemes Using Color Theory

Color is one of the most impactful decisions in any design — and one of the most difficult to get right without a structured approach. Colors that work harmoniously together make an interface feel coherent, professional, and trustworthy. Colors that clash or compete make even a well-designed layout feel unpolished and hard to read. The challenge is that color harmony isn't purely intuitive: it's based on mathematical relationships between hues, saturation levels, and perceptual contrast that aren't obvious when you're staring at a color picker and trying to pick a good second color to go with your brand blue.

This generator takes any starting color and derives palette combinations using established color theory harmony relationships — complementary, analogous, triadic, split-complementary, tetradic, and monochromatic. Each palette shows every swatch with its HEX, RGB, and HSL values, ready to copy into CSS variables, Tailwind configuration, Figma, or any design system documentation.

Color Harmony Types — What Each One Does

Color harmony relationships are derived from the positions of hues on the color wheel. Each relationship produces a different emotional quality and works best in different design contexts:

Complementary: Two colors directly opposite each other on the color wheel — blue and orange, red and green, purple and yellow. Complementary pairs produce the highest contrast of any harmony type, which makes them excellent for call-to-action buttons, accent elements, and anything that needs to pop against a background. The risk is visual tension when both colors are used in equal amounts — typically you use one as the dominant color and the other sparingly as an accent.

Analogous: Three to five colors that sit adjacent to each other on the color wheel — blue, blue-green, and green, for example. Analogous palettes feel natural, calm, and cohesive. They're ideal for backgrounds, navigation elements, and designs where visual comfort is more important than contrast. Most nature-inspired and wellness-oriented designs use analogous palettes.

Triadic: Three hues evenly spaced 120° apart on the color wheel — red, yellow, and blue; or orange, green, and violet. Triadic palettes offer strong visual contrast and variety while remaining balanced. They're popular in playful, energetic, or vibrant designs — consumer apps, children's products, creative tools.

Split-complementary: The base color plus the two colors adjacent to its direct complement, rather than the complement itself. For example, if your base is blue (complement: orange), split-complementary gives you yellow-orange and red-orange. This provides strong contrast similar to complementary, but with less visual tension and more flexibility — the two accent colors are easier to use together than a single hard complement.

Tetradic (square): Four hues evenly spaced 90° apart on the color wheel. This provides the richest, most varied palette but is the hardest to balance — with four competing colors, careful attention to which dominates and which accents is critical. Works well in complex, multi-section interfaces with a well-defined hierarchy.

Monochromatic: A single hue at varying lightness and saturation levels — from light tints to dark shades. Monochromatic palettes feel clean, minimal, and cohesive. They're the easiest to work with for UI systems where you need predictable, controllable color, and they naturally support light and dark mode by shifting the lightness scale.

Building Tonal Scales for Design Systems

Modern UI design systems don't just use a single value per color — they define tonal scales of 8–12 steps from very light (near-white tint) to very dark (near-black shade). Tailwind CSS's default color palette is a good example: each color like blue has 11 steps from blue-50 (near-white blue tint) to blue-950 (very dark blue shade). This gives designers and developers a full range of values for backgrounds, borders, text, and icons across light and dark mode.

For consistent-feeling tonal scales, adjust the HSL lightness value in even steps while keeping hue and saturation roughly constant. In practice, slight saturation adjustments at extreme lightness values (reducing saturation at very light values, increasing slightly at mid-range) produce more natural-looking scales. The OKLCH color space makes this more predictable — lightness values in OKLCH are perceptually uniform, meaning each step feels equally different to the human eye.

Using Palette Colors in CSS and Tailwind

In CSS, define palette colors as custom properties (variables) in :root and reference them throughout your stylesheets. This approach makes theme changes — including dark mode — straightforward, because you only change the variable values in one place rather than updating every rule individually. A typical primary color definition: --color-primary-100: #ede9fe; --color-primary-500: #4f46e5; --color-primary-900: #312e81;.

In Tailwind CSS, add your palette to tailwind.config.js under theme.extend.colors (to add alongside defaults) or theme.colors (to replace defaults). Each key becomes a utility prefix — brand-500, brand-100 — usable as text-brand-500, bg-brand-100, border-brand-200, etc. throughout your templates.

Frequently Asked Questions About Color Palettes

A practical UI palette typically includes a primary color (with light and dark variants), a secondary or accent color, a neutral scale (grays from near-white to near-black), and semantic colors (green for success, red for errors, yellow for warnings, blue for info). That usually works out to 20–40 specific values across the system. Avoid defining too many unique colors — the fewer variables you use, the more consistent and maintainable your interface will be.
WCAG 2.1 requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text (18pt or 14pt bold) against the background. After generating a palette, test each text-on-background combination with a contrast checker. Tools like WebAIM Contrast Checker or browser DevTools accessibility panels calculate the ratio from two color values. Make sure your palette includes both light and dark variants so text remains readable in all usage contexts.
HEX is the most commonly expected format in design handoff, style guides, and many CSS codebases — short and readable. RGB is useful when you need to add transparency: rgba(79, 70, 229, 0.5). HSL is easiest to reason about for generating tints and shades programmatically — adjusting the lightness value predictably lightens or darkens the color without changing hue. In modern CSS, you can also use oklch for perceptually uniform lightness steps, which produces more even-looking tonal scales.
They're a strong starting point for exploration and rapid iteration. Final brand palettes should be tested across real UI contexts (light and dark backgrounds, buttons, text), verified for accessibility, checked in print (CMYK conversion), and reviewed for how they render on screens with different color profiles. The generated palettes here give you mathematically sound starting combinations that you can then refine with professional judgment.
A tint is a color mixed with white — it makes the color lighter. A shade is a color mixed with black — it makes the color darker. A tone is a color mixed with grey — it reduces saturation while adjusting lightness. In CSS terms: tints increase the l (lightness) value in HSL; shades decrease it; tones decrease the s (saturation) value. Monochromatic palettes are typically built from a series of tints, shades, and tones of the same base hue.