Written by Jane Smith · Reviewed by Alex Chen · July 16, 2026
Generate beautiful 5-color palettes using color theory harmonies. Pick a base color and choose from monochromatic, complementary, analogous, triadic, or tetradic schemes.
Select a color and click Generate to create your palette.
The Color Palette Generator takes any base color and returns five swatches that follow one of five color-theory rules: monochromatic, complementary, analogous, triadic, or tetradic. Each swatch is a plain hex code, so the palette drops straight into a stylesheet, a design file, or a brand document. The relationships come from the color wheel: the tool rotates the base hue, and sometimes shifts lightness or saturation, to place the other four colors where the rule says they belong.
Start with the blue #2196F3, whose hue sits at 207 degrees on the wheel. The complementary harmony pairs it with the color 180 degrees away, which lands at 27 degrees and resolves to #F37F20, a warm orange. The two colors that flank that complement, 30 degrees on either side, are #F3202B and #F3E920, a red and a yellow. Designers call the three-color group of #2196F3, #F3202B, and #F3E920 a split-complementary scheme, and it is gentler than the direct pair while keeping the same tension. The generator has no split-complementary mode, so build it by choosing the Complementary harmony and swapping in either flanking color for the orange.
Every harmony mode produces the base color plus four derived colors, so a palette is always five hex codes wide. Monochromatic keeps the base hue and walks lightness and saturation up and down, which gives calm, cohesive pairs that work well on large surfaces. Complementary rotates the hue by 180 degrees for one high-contrast partner. Analogous shifts the hue by 30 degrees in each direction for three neighbors that sit quietly together. Triadic rotates 120 degrees twice, spacing three colors evenly around the wheel, and tetradic, labeled Rectangle in the selector, places two complementary pairs so the four colors balance across the circle.
A very light base, such as #F5F5F5, produces swatches with little separation between them, because rotating the hue cannot rescue colors that are all nearly white. A very dark base behaves the same way at the other end. Hue rotations wrap cleanly around the wheel, so a base at 350 degrees reaches the red range without error. Hex output is exact, but the same palette looks different on an uncalibrated monitor, a phone in night mode, and a color-calibrated print proof, so preview on the devices you actually ship to. Color blindness can collapse pairs that look distinct to other viewers, which is why contrast-critical text should be checked with a dedicated tool rather than trusted to a palette alone.
The four colors sit at the corners of a rectangle on the color wheel, which is two complementary pairs. The scheme works best when one pair leads and the other supplies accents.
Yes, they are standard CSS colors that every browser and design application accepts. Copy them into your stylesheet variables and the swatches in the tool stay in sync with the code you paste.
Start with analogous for the background and headline, then draw attention with a complementary accent from the same palette. Reserve triadic and tetradic for charts and data where three or four distinct categories need equal visual weight.
Screens vary in color profile and brightness, and a printed proof will differ from both. Preview the palette on the display your audience will actually use.
Copy the swatches as individual hex values or as one block and paste them into a document, a design tool, or a CSS file. The generator holds no accounts and keeps no history, so the palette exists only where you choose to save it.
A generated harmony is a fast starting point for a landing page, a dashboard theme, or a slide deck, and it saves the tinkering that comes with picking colors one by one. It is not a substitute for accessibility work: text and background pairs still need a contrast check, and the smallest font sizes need the strictest ratio. For a brand with fixed colors, treat the generator as an exploration tool and lock the winners into your design tokens, rather than regenerating fresh palettes each time. When a palette must carry a specific mood or match a logo, hand-tuning beats any formula, because the wheel knows nothing about the feeling a company wants to project. The whole calculation runs locally in the page, and your base color is never transmitted anywhere.
The tool takes a hex value such as #2196F3 and splits it into its red, green, and blue components — the pairs 21, 96, and F3 — then converts those three channels into the hue, saturation, and lightness numbers the color wheel works with. Harmonies rotate the hue and adjust the saturation or lightness, and the results are converted back to hex for display. The conversion follows the standard sRGB formulas every browser uses, so the swatch on screen and the code you copy always agree.
In monochromatic mode the hue never moves; instead the lightness walks in steps so the five swatches climb from a near-black tint to a near-white shade while the saturation stays put. That is why a monochromatic palette feels flat and calm next to a complementary one. The base color you choose anchors the whole group, so start from a brand color, a favorite hue, or a hex code you already use. Lightness matters more than the harmony: two palettes built on the same hue at different lightness levels read as completely different moods. For the smoothest result, pick a base in the middle of the lightness range rather than a near-white or near-black corner, and let the tool's saturation keep the family together.