Colors Encyclopedia

Named color

Rebecca Purple

Rebecca Purple color #663399: RGB 102, 51, 153 and HSL 270°, 50%, 40%. Explore its cool purple profile, contrast, CSS, palettes and harmonies.

#663399 purple cool jewel-tone
HEX #663399
RGB rgb(102, 51, 153)
HSL hsl(270 50% 40%)
CMYK cmyk(33, 67, 0, 40)
Luminance 0.0749
Contrast Black 2.5:1White 8.41:1

Use this color

Create with Rebecca Purple

Open a professional color tool with #663399 already applied. Each configuration stays canonical to the tool and can be adjusted or shared.

All color tools
Generate palette & CSS variablesCreate 50–950 tokens and export CSS, SCSS, JSON, or Tailwind.Open configured tool →Open in Gradient StudioStart with Rebecca Purple and its complementary color.Open configured tool →Mix this colorBlend it with a complementary color and copy color-mix() CSS.Open configured tool →Check contrastOpen the strongest black or white background pairing.Open configured tool →Accessible combinationsReview AA and AAA text options, alternatives, warnings, and UI guidance.Open configured tool →Create glass surfaceUse this color as the tint for a translucent UI panel.Open configured tool →

CSS Utilities

--color-rebecca-purple: #663399;
.bg-rebecca-purple { background-color: #663399; }
.text-rebecca-purple { color: #663399; }
Open CSS utility pageReusable variables, classes, examples, and implementation notes

Color history, meaning and use · Editorially reviewed

About Rebecca Purple Color

Rebecca Purple is unusual among standardized CSS colors because its origin is both recent and documented. The CSS Working Group added rebeccapurple with the value #663399 in 2014 as a tribute to web standards author Eric Meyer’s daughter Rebecca and as an expression of support from the web community.

Unlike material names whose physical samples vary, Rebecca Purple is exact in CSS: the keyword resolves to a defined sRGB value and is case-insensitive like other CSS identifiers. It can be used anywhere a CSS color is accepted. Its significance, however, comes from community history rather than from being a supposedly universal or psychologically fixed purple.

This page documents the standardized web color respectfully; it should not turn the personal history behind the name into decorative marketing copy.

WCAG Accessibility

Contrast checks for Rebecca Purple against black and white text.

Black text2.5:1AA Fail
White text8.41:1AA Pass
AA text options#FFFFFF, #F5F5F5
AAA text options#FFFFFF, #F5F5F5
Open WCAG pageDetailed contrast notes, warnings, alternatives, and UI examples

Downloadable color reference infographic

Rebecca Purple Color Reference Infographic

Save a high-resolution infographic of Rebecca Purple, including its color values, coordinated palette, and black and white text contrast.

1200 × 800
Rebecca Purple color reference infographic showing #663399, RGB and HSL values, a coordinated palette, and black and white text contrast.
Rebecca Purple color reference infographic generated from the verified Colors Encyclopedia dataset.
Download WebPDownload SVGOpen full size

Color Harmonies

#669933#669933#333399#333399#993399#993399#996633#996633#339966#339966
Open full Rebecca Purple harmony pageComplementary, analogous, triadic, tetradic, split, and monochromatic sets

Variants

#945EC9#945EC9#381C54#381C54#661DAF#661DAF#664983#664983#A687C5#A687C5#7A00F5#7A00F5

Pairings

White#FFFFFF#669933#669933#333399#333399#993399#993399Matte Black#1A1A1AWhite Smoke#F5F5F5

Machine-readable data

Machine-Readable Color Data (JSON)

Perfect for CSS, design systems, automation, and AI ingestion.

AI-Ready Dataset v1.0.0
Luminance0.0749
Black text2.5:1AA Fail
White text8.41:1AA Pass
hexCanonical HEX value
rgbRed, green, blue channels
hslHue, saturation, lightness
cmykApproximate print conversion
wcagAA and AAA contrast options
harmoniesMathematical harmony sets
variantsGenerated tone variants
nearestColorsKnowledge graph neighbors
Download JSON Open API
Structured sections
Color systems
{
  "hex": "#663399",
  "rgb": [
    102,
    51,
    153
  ],
  "hsl": [
    270,
    50,
    40
  ],
  "cmyk": [
    33,
    67,
    0,
    40
  ],
  "luminance": 0.0749,
  "contrast": {
    "black": 2.5,
    "white": 8.41
  }
}
WCAG
{
  "AA": [
    "#FFFFFF",
    "#F5F5F5"
  ],
  "AAA": [
    "#FFFFFF",
    "#F5F5F5"
  ]
}
Harmonies
{
  "complementary": "#669933",
  "analogous": [
    "#333399",
    "#993399"
  ],
  "triadic": [
    "#996633",
    "#339966"
  ],
  "tetradic": [
    "#993333",
    "#669933",
    "#339999"
  ],
  "splitComplementary": [
    "#999933",
    "#339933"
  ],
  "monochromatic": [
    "#945EC9",
    "#663399",
    "#381C54"
  ]
}
Variants
{
  "light": "#945EC9",
  "dark": "#381C54",
  "saturated": "#661DAF",
  "desaturated": "#664983",
  "pastel": "#A687C5",
  "neon": "#7A00F5"
}
Pairings
{
  "best": [
    "#FFFFFF",
    "#669933",
    "#333399",
    "#993399"
  ],
  "avoid": [
    "#664983",
    "#945EC9"
  ],
  "neutral": [
    "#1A1A1A",
    "#F5F5F5",
    "#E8E8E4"
  ],
  "highContrast": [
    "#FFFFFF"
  ],
  "lowContrast": [
    "#945EC9",
    "#664983"
  ]
}
Knowledge graph
{
  "nearestColors": [
    "amethyst-deep",
    "grape",
    "iolite",
    "dark-slate-blue",
    "royal-purple"
  ],
  "generatedPalettes": [
    "rebecca-purple"
  ],
  "generatedComparisons": [
    "amethyst-deep-vs-rebecca-purple",
    "grape-vs-rebecca-purple",
    "plum-purple-vs-rebecca-purple"
  ],
  "relatedFamilies": [
    "/colors/by-family/purple",
    "/colors/by-temperature/cool",
    "/colors/by-tone/jewel-tone"
  ],
  "relatedTools": [
    "/harmonies/rebecca-purple",
    "/wcag/rebecca-purple",
    "/css/colors/rebecca-purple",
    "/hex/663399",
    "/tools/css-gradient-generator",
    "/tools/color-palette-generator",
    "/tools/css-color-mixer",
    "/tools/contrast-checker"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/purple",
      "/colors/by-temperature/cool",
      "/colors/by-tone/jewel-tone"
    ],
    "narrower": [
      "/palettes/rebecca-purple"
    ],
    "related": [
      "/colors/amethyst-deep",
      "/colors/grape",
      "/colors/iolite",
      "/colors/dark-slate-blue",
      "/colors/royal-purple",
      "/compare/amethyst-deep-vs-rebecca-purple",
      "/compare/grape-vs-rebecca-purple",
      "/compare/plum-purple-vs-rebecca-purple",
      "/harmonies/rebecca-purple",
      "/wcag/rebecca-purple",
      "/css/colors/rebecca-purple",
      "/hex/663399",
      "/tools/css-gradient-generator",
      "/tools/color-palette-generator",
      "/tools/css-color-mixer",
      "/tools/contrast-checker"
    ]
  }
}
Full JSON dataset 
{
  "slug": "rebecca-purple",
  "name": "Rebecca Purple",
  "cssName": "rebeccapurple",
  "hex": "#663399",
  "family": "purple",
  "temperature": "cool",
  "tone": [
    "jewel-tone"
  ],
  "uses": [
    "web design",
    "CSS color systems",
    "UI prototyping"
  ],
  "psychology": {
    "associations": [
      "context dependent"
    ],
    "contexts": [
      "web interfaces",
      "design systems",
      "technical color references"
    ],
    "avoidIn": [
      "claims that require brand or cultural specificity"
    ]
  },
  "aliases": [
    "rebeccapurple"
  ],
  "sourceType": "standard",
  "confidence": "high",
  "sourceUrl": "https://www.w3.org/TR/css-color-4/#named-colors",
  "origin": {
    "type": "css",
    "notes": "Standard CSS named color."
  },
  "reviewStatus": "auto",
  "editorialNotes": "Generated from CSS named color data and computed color-system properties.",
  "tags": [
    "purple",
    "cool",
    "jewel-tone",
    "web-design",
    "css-color-systems",
    "ui-prototyping",
    "context-dependent"
  ],
  "popularity": 67,
  "rgb": [
    102,
    51,
    153
  ],
  "hsl": [
    270,
    50,
    40
  ],
  "cmyk": [
    33,
    67,
    0,
    40
  ],
  "luminance": 0.0749,
  "contrast": {
    "black": 2.5,
    "white": 8.41
  },
  "harmonies": {
    "complementary": "#669933",
    "analogous": [
      "#333399",
      "#993399"
    ],
    "triadic": [
      "#996633",
      "#339966"
    ],
    "tetradic": [
      "#993333",
      "#669933",
      "#339999"
    ],
    "splitComplementary": [
      "#999933",
      "#339933"
    ],
    "monochromatic": [
      "#945EC9",
      "#663399",
      "#381C54"
    ]
  },
  "variants": {
    "light": "#945EC9",
    "dark": "#381C54",
    "saturated": "#661DAF",
    "desaturated": "#664983",
    "pastel": "#A687C5",
    "neon": "#7A00F5"
  },
  "wcag": {
    "AA": [
      "#FFFFFF",
      "#F5F5F5"
    ],
    "AAA": [
      "#FFFFFF",
      "#F5F5F5"
    ]
  },
  "css": {
    "variable": "--color-rebecca-purple: #663399;",
    "utility": ".bg-rebecca-purple { background-color: #663399; }",
    "textUtility": ".text-rebecca-purple { color: #663399; }"
  },
  "nearestColors": [
    "amethyst-deep",
    "grape",
    "iolite",
    "dark-slate-blue",
    "royal-purple"
  ],
  "generatedPalettes": [
    "rebecca-purple"
  ],
  "generatedComparisons": [
    "amethyst-deep-vs-rebecca-purple",
    "grape-vs-rebecca-purple",
    "plum-purple-vs-rebecca-purple"
  ],
  "relatedFamilies": [
    "/colors/by-family/purple",
    "/colors/by-temperature/cool",
    "/colors/by-tone/jewel-tone"
  ],
  "relatedTools": [
    "/harmonies/rebecca-purple",
    "/wcag/rebecca-purple",
    "/css/colors/rebecca-purple",
    "/hex/663399",
    "/tools/css-gradient-generator",
    "/tools/color-palette-generator",
    "/tools/css-color-mixer",
    "/tools/contrast-checker"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/purple",
      "/colors/by-temperature/cool",
      "/colors/by-tone/jewel-tone"
    ],
    "narrower": [
      "/palettes/rebecca-purple"
    ],
    "related": [
      "/colors/amethyst-deep",
      "/colors/grape",
      "/colors/iolite",
      "/colors/dark-slate-blue",
      "/colors/royal-purple",
      "/compare/amethyst-deep-vs-rebecca-purple",
      "/compare/grape-vs-rebecca-purple",
      "/compare/plum-purple-vs-rebecca-purple",
      "/harmonies/rebecca-purple",
      "/wcag/rebecca-purple",
      "/css/colors/rebecca-purple",
      "/hex/663399",
      "/tools/css-gradient-generator",
      "/tools/color-palette-generator",
      "/tools/css-color-mixer",
      "/tools/contrast-checker"
    ]
  },
  "pairings": {
    "best": [
      "#FFFFFF",
      "#669933",
      "#333399",
      "#993399"
    ],
    "avoid": [
      "#664983",
      "#945EC9"
    ],
    "neutral": [
      "#1A1A1A",
      "#F5F5F5",
      "#E8E8E4"
    ],
    "highContrast": [
      "#FFFFFF"
    ],
    "lowContrast": [
      "#945EC9",
      "#664983"
    ]
  }
}
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

Similar Colors

Amethyst Deep#5D3A9B
Grape#6F2DA8
Iolite#5A4C8D
Dark Slate Blue#483D8B
Royal Purple#7851A9

Related Color Guides

Purple color familyBrowse named purple colors and compare nearby swatches.Cool colorsExplore colors with cool temperature behavior.Jewel Tone colorsFind colors with jewel tone visual character.Rebecca Purple accessibilityCheck contrast and WCAG text options for #663399.Rebecca Purple CSS utilitiesUse Rebecca Purple in CSS variables and utility classes.#663399 HEX atlasOpen the permanent HEX atlas record for conversions and variants.Rebecca Purple paletteOpen the generated palette based on Rebecca Purple.Rebecca Purple harmoniesExplore complementary, analogous, triadic, and tetradic harmonies.