Generate harmonious color palettes from a base color using color theory. Includes WCAG contrast analysis for all color pairs.
Color Scheme
Contrast Analysis (WCAG)
All color-pair combinations from your palette checked against WCAG AA.
Foreground
Background
Ratio
AA Normal
AA Large
About Palette Generator & Contrast Analyzer
Generate color palettes using proven color theory principles - analogous, complementary, triadic, tetradic, and more. Every generated palette is automatically analyzed for WCAG AA contrast ratios so you can build accessible designs from the start.
Color Scheme Types
Analogous - neighboring hues on the wheel, harmonious · Complementary - opposite hues, high contrast · Triadic - three evenly spaced hues · Monochromatic - variations in lightness of one hue · Shades - tints and shades from white to black
Frequently Asked Questions
Analogous colors sit adjacent to each other on the color wheel (e.g. blue, blue-green, green). They create harmonious, natural-looking palettes commonly used for calm, unified designs like nature photography sites and wellness brands.
Complementary colors are directly opposite on the color wheel (e.g. blue and orange). They create strong contrast and visual tension, making them effective for call-to-action buttons and sports brands.
The WCAG contrast ratio determines whether text is readable against a background color, particularly for users with low vision or color blindness. Using palette colors that pass WCAG AA (4.5:1) ensures your design is accessible and often legally compliant.
Click "Copy CSS Variables" to get a :root { --color-1: #...; } block. Paste it in your CSS file, then reference the colors anywhere with var(--color-1). This keeps your palette centralized and easy to update.
About Color Palette Generator Online
The Oneyfy color palette generator online creates harmonious color combinations from a single base color using established color theory relationships: complementary, analogous, triadic, tetradic, and split-complementary. Every palette is displayed as swatches with HEX, RGB, and HSL values that you can copy with a click. Graphic designers, web developers, UI/UX designers, and brand identity creators use this tool to quickly explore color schemes that are grounded in theory rather than guesswork.
Choosing colors that work well together is one of the most common challenges in design. Color theory provides a structured framework: rotate the hue around the color wheel by specific angles and the resulting colors are mathematically harmonious. This generator applies those formulas instantly, letting you test dozens of palette variations in the time it would take to manually calculate a single one. It is especially useful when you have a brand's primary color established and need to build a full palette of supporting colors around it.
How to Use the Color Palette Generator
Choose a Base Color using the visual color picker or type a HEX code directly into the hex input field (e.g., #6366f1).
Select a Harmony Type from the dropdown: complementary, analogous, triadic, tetradic, or split-complementary.
The palette updates instantly — color swatches appear with their HEX, RGB, and HSL values displayed below each swatch.
Click any swatch to copy its HEX code to your clipboard for immediate use in your design tool or CSS.
Click Generate Random to pick a random base color and harmony type when you want fresh inspiration without a starting point.
Harmony Types Explained
Each harmony type produces a different kind of color relationship. Choosing the right harmony for your project is as important as the base color itself:
Complementary: One color directly opposite on the color wheel (180° hue shift). Creates the highest contrast of any harmony type. Best for bold, attention-grabbing designs like call-to-action buttons, sports brands, and sale promotions. Use sparingly — full-saturation complementary colors vibrate when placed directly adjacent.
Analogous: Two or three colors adjacent on the wheel (±30° shifts). Feels natural, calm, and cohesive. Found throughout nature. Ideal for wellness brands, nature photography sites, and any design where you want the palette to feel unified rather than energetic. Works well for large background areas.
Triadic: Three colors evenly spaced 120° apart on the wheel. Vibrant and visually rich while maintaining a sense of balance. Popular in children's media, creative industries, and entertainment brands. Requires careful management of saturation and value to avoid visual chaos.
Tips for Getting the Best Results
A mathematically harmonic palette is a starting point, not a finished design. These tips help you refine generated palettes into production-ready color systems.
Adjust saturation and lightness, not just hue: The generator rotates hues on the color wheel while preserving the saturation and lightness of your base color. In practice, a multi-color palette looks most polished when colors have varied lightness — a dark shade for backgrounds, a mid-tone for accents, and a light tint for highlights. Modify the HSL values slightly after generating to create this range.
Start with your brand's primary color: If you already have a defined brand primary (your logo color, for instance), enter that HEX code as the base and let the generator derive supporting colors. This ensures your full palette is theoretically harmonious with your established brand color rather than chosen arbitrarily.
Check contrast before using colors for text: Color harmony does not guarantee WCAG accessibility compliance. A pale yellow that looks great next to a deep navy in a swatch may have only 2:1 contrast when used as text on a white background — far below the WCAG AA minimum of 4.5:1. Always verify text/background pairs using a dedicated contrast checker before finalizing your palette for production.
Use the tetradic type for complex UIs: Tetradic (two complementary pairs, 90° apart) gives you four distinct hues for large design systems with many components and states. The extra colors provide more options for status indicators, category labels, chart series, and interactive element states than a simpler triadic or analogous palette.
Copy HSL values for CSS custom properties: HSL values are more useful in CSS than HEX because you can adjust lightness programmatically. Define your palette as :root { --color-primary-hsl: 239, 84%, 67%; } and then reference it as hsl(var(--color-primary-hsl)) or lighten it with hsl(239, 84%, 90%) without creating a separate variable.
Why Use a Color Palette Generator Online
Manually applying color theory requires knowing the hue angles for each harmony type, converting between color spaces, and doing the math for multiple colors simultaneously. An online generator eliminates all of that, producing a complete palette from a single input in under a second. Because all calculations happen in your browser using JavaScript and HSL math, there are no server round-trips, no account requirements, and no data about your colors sent anywhere.
Freelance designers working on branding projects will use it to generate initial palette options for client presentations. Front-end developers setting up a CSS design system will use it to define a theoretically grounded variable set. Marketing teams creating campaign assets will use it to ensure their ad creatives are color-harmonious. Anyone who makes visual decisions for the web benefits from a quick, free, theory-backed palette tool.
Frequently Asked Questions about Color Palette Generator
The complementary color is the hue directly opposite your base color on the color wheel — exactly 180 degrees away in hue angle. Complementary pairs create the maximum possible contrast between two hues, which is why they are used in high-impact designs like sale banners, sports uniforms, and call-to-action buttons. Pure complementary pairs at full saturation can feel visually harsh — desaturating one of the two colors usually produces a more refined result.
Analogous palettes use colors that sit adjacent to each other on the color wheel, typically within a ±30° range of the base hue. Because the colors share underlying hue characteristics, they feel naturally harmonious — you see analogous palettes constantly in nature (autumn leaves, ocean gradients, sunsets). They work best for calm, cohesive designs like wellness brands, editorial layouts, and backgrounds, where you want color richness without visual tension.
Click each swatch to copy its HEX code, then define your palette as CSS custom properties in your stylesheet: :root { --color-primary: #6366f1; --color-accent: #f1a633; --color-muted: #93c5fd; }. Reference these variables throughout your CSS with var(--color-primary). This approach centralizes your palette — when you need to adjust a color, you change it in one place and the update propagates everywhere it is used.
Color harmony does not guarantee WCAG accessibility compliance. A harmonious palette can still fail accessibility contrast requirements if the colors are too similar in lightness. Before using any palette color for text on a background, verify the contrast ratio using the Oneyfy Color Contrast Checker. WCAG AA requires a minimum 4.5:1 contrast ratio for normal text and 3:1 for large text (18px+ or 14px+ bold).
Yes, completely free. No account, no export limits, and no watermark. All five harmony types — complementary, analogous, triadic, tetradic, and split-complementary — are available without any cost. The tool runs entirely in your browser using JavaScript, with no data sent to a server. You can generate and copy as many palettes as you need for personal or commercial projects.
A triadic palette uses three hues spaced evenly 120° apart on the color wheel, giving you three distinct colors. A tetradic palette uses four hues — two complementary pairs placed 90° apart — giving you four distinct colors. Triadic palettes are easier to balance and work well for simpler designs. Tetradic palettes offer more variety for complex design systems with many components but require more careful management to avoid a chaotic, over-colored result.
The primary input is a HEX color code (e.g., #6366f1) entered via the text field, or through the visual color picker which lets you choose by hue, saturation, and lightness interactively. If you have an RGB or HSL value you want to use, convert it to HEX first using any online color converter, then paste the HEX code into the input field.
Yes. The color palette generator is fully responsive and works in mobile browsers. You can tap the color picker, select harmony types from the dropdown, and tap any swatch to copy its HEX value to your mobile clipboard. The swatch grid adapts to narrower screens so all colors remain accessible. The Generate Random button is particularly useful on mobile for quick inspiration browsing.