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Color Palette Generator

Generate beautiful, harmonious color palettes from a single base color — perfect for UI design.

A good color palette is not a random collection of pretty colors — it is a set of colors chosen by a rule, and the rule is what makes them work together. Designers do not pick five colors they happen to like; they choose one base color and derive the others through relationships on the color wheel: complementary, analogous, triadic. This is why professional palettes feel cohesive and amateur ones feel noisy. This tool generates harmonious palettes from a single base color using those established color-theory relationships, giving you a coordinated set to build a design on instead of guessing.

How the generator works

Pick a base color and a harmony rule, and the tool calculates the other colors by their mathematical relationship to your base on the color wheel. A complementary scheme takes the color opposite; analogous takes neighbors; triadic takes three evenly spaced points; and so on. Because the relationships are geometric, the resulting colors are guaranteed to relate to each other in a way the eye reads as intentional. You get the hex codes ready to drop into a design.

The harmony rules

On the 360° color wheel, from your base hue H: Complementary H, H+180 → high contrast Analogous H, H+30, H−30 → calm, cohesive Triadic H, H+120, H+240 → vibrant, balanced Split-comp. H, H+150, H+210 → contrast, softer Tetradic H, H+90, H+180, H+270 → rich, complex Saturation and lightness stay near the base.

The whole system works because hue is an angle, so relationships become simple arithmetic on a circle. Complementary colors sit 180° apart, which is why they produce maximum contrast — they are as far from each other as the wheel allows. Analogous colors sit within 30° or so, sharing enough hue to feel harmonious and calm. The reason to keep saturation and lightness consistent across the palette is that varying the hue by rule while holding the other two steady is exactly what makes a set feel like a coordinated family rather than a random assortment.

What to know about color palettes

  • 1Use the 60-30-10 rule to apply a palette. A dominant color for 60% of the design, a secondary for 30%, and an accent for 10% creates visual hierarchy and keeps the result from feeling chaotic. A palette is the raw material; this ratio is how professionals turn a set of colors into a balanced interface rather than an even, flat wash of all of them.
  • 2Complementary schemes are high-contrast — use the accent sparingly. Two opposite colors at full strength fight for attention and can vibrate uncomfortably. The professional move is a dominant base with its complement reserved for small, high-impact accents like buttons and calls to action, where the contrast works for you instead of overwhelming the design.
  • 3Always check contrast for text, not just aesthetics. A palette can be beautiful and still fail accessibility if text and background do not have enough contrast — WCAG requires a 4.5:1 ratio for normal text. Harmonious colors are often similar in lightness, which reads as elegant but can make text unreadable. Verify contrast separately from harmony.
  • 4Analogous palettes are the safe, calm default. Colors that sit next to each other on the wheel are almost impossible to get wrong — they share enough hue to feel unified and low-tension. When a design needs to feel serene, coherent, and professional without risk, an analogous scheme is the reliable starting point that rarely disappoints.
  • 5Reserve saturated colors for accents, not large areas. A fully saturated color across a big surface is exhausting to look at and makes text hard to read on top of it. The mature approach uses desaturated or light versions of the palette for backgrounds and large areas, saving the punchy, saturated versions for small elements that need to draw the eye.

Frequently asked questions

What makes colors go well together?

A defined relationship on the color wheel rather than personal taste. Colors that sit at specific angles from each other — opposite for complementary, adjacent for analogous, evenly spaced for triadic — read as intentional and harmonious because the eye recognizes the pattern. This is why palettes built from color-theory rules feel cohesive while randomly chosen colors feel noisy. The harmony comes from the geometry, not from the individual colors being attractive on their own.

What is the difference between complementary and analogous palettes?

Complementary uses colors opposite each other on the wheel (180° apart), producing high contrast and energy — good for grabbing attention but intense if overused. Analogous uses neighboring colors (within about 30°), producing a calm, cohesive, low-tension feel — good for serene, unified designs. Complementary schemes need their contrast used carefully as accents; analogous schemes are more forgiving and hard to get wrong, which makes them a common safe default.

How many colors should a palette have?

Usually three to five for a coherent design: a dominant color, one or two secondary colors, and an accent. More than that becomes hard to apply consistently and tends to look chaotic. The classic 60-30-10 rule — 60% dominant, 30% secondary, 10% accent — works best with a small palette. It is easier to build a strong design from a few well-chosen colors than to wrangle a large set into looking coordinated.

How do I make sure my colors are accessible?

Check the contrast ratio between text and its background separately from checking harmony. WCAG requires at least 4.5:1 for normal text and 3:1 for large text. Harmonious palettes often use colors of similar lightness, which looks elegant but can leave text unreadable, so a beautiful palette still needs a contrast check. Keep your text colors and background colors far enough apart in lightness to clear the ratio, even if that means adjusting the harmony slightly.

Can I build a whole design from one base color?

Yes — that is exactly what harmony rules are for. Starting from a single base color and deriving the others through complementary, analogous, or triadic relationships gives you a complete, coordinated palette. Adding lighter and darker shades of each for backgrounds, borders, and states rounds it out into a full design system. Building from one base color is more reliable than assembling colors independently, because every color in the set is anchored to the same origin.