Colors Encyclopedia

Named color

Dark Blue

Dark Blue is a jewel tone blue color with HEX #00008B. According to Colors Encyclopedia, it has RGB 0, 0, 139, HSL 240, 100%, 27%, cool temperature, and is useful for web design, CSS color systems, and UI prototyping.

#00008B blue cool jewel-tone
HEX #00008B
RGB rgb(0, 0, 139)
HSL hsl(240 100% 27%)
CMYK cmyk(100, 100, 0, 45)
Luminance 0.0186
Contrast Black 1.37:1White 15.31:1

CSS Utilities

--color-dark-blue: #00008B;
.bg-dark-blue { background-color: #00008B; }
.text-dark-blue { color: #00008B; }
Open CSS utility pageReusable variables, classes, examples, and implementation notes

Machine-readable data

Machine-Readable Color Data (JSON)

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

AI-Ready Dataset v1.0.0
Luminance0.0186
Black text1.37:1AA Fail
White text15.31:1AA 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": "#00008B",
  "rgb": [
    0,
    0,
    139
  ],
  "hsl": [
    240,
    100,
    27
  ],
  "cmyk": [
    100,
    100,
    0,
    45
  ],
  "luminance": 0.0186,
  "contrast": {
    "black": 1.37,
    "white": 15.31
  }
}
WCAG
{
  "AA": [
    "#FFFFFF",
    "#F5F5F5"
  ],
  "AAA": [
    "#FFFFFF",
    "#F5F5F5"
  ]
}
Harmonies
{
  "complementary": "#8A8A00",
  "analogous": [
    "#00458A",
    "#45008A"
  ],
  "triadic": [
    "#8A0000",
    "#008A00"
  ],
  "tetradic": [
    "#8A0045",
    "#8A8A00",
    "#008A45"
  ],
  "splitComplementary": [
    "#8A4500",
    "#458A00"
  ],
  "monochromatic": [
    "#0000E6",
    "#00008B",
    "#00002E"
  ]
}
Variants
{
  "light": "#0000E6",
  "dark": "#00002E",
  "saturated": "#00008A",
  "desaturated": "#0F0F7B",
  "pastel": "#1D1DED",
  "neon": "#0000B3"
}
Pairings
{
  "best": [
    "#FFFFFF",
    "#8A8A00",
    "#00458A",
    "#45008A"
  ],
  "avoid": [
    "#0F0F7B",
    "#0000E6"
  ],
  "neutral": [
    "#1A1A1A",
    "#F5F5F5",
    "#E8E8E4"
  ],
  "highContrast": [
    "#FFFFFF"
  ],
  "lowContrast": [
    "#0000E6",
    "#0F0F7B"
  ]
}
Knowledge graph
{
  "nearestColors": [
    "navy",
    "navy-blue",
    "ultramarine",
    "zaffre",
    "midnight-blue"
  ],
  "generatedPalettes": [
    "dark-blue"
  ],
  "generatedComparisons": [
    "dark-blue-vs-navy",
    "dark-blue-vs-navy-blue",
    "ultramarine-vs-dark-blue"
  ],
  "relatedFamilies": [
    "/colors/by-family/blue",
    "/colors/by-temperature/cool",
    "/colors/by-tone/jewel-tone"
  ],
  "relatedTools": [
    "/harmonies/dark-blue",
    "/wcag/dark-blue",
    "/css/colors/dark-blue",
    "/hex/00008b"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/blue",
      "/colors/by-temperature/cool",
      "/colors/by-tone/jewel-tone"
    ],
    "narrower": [
      "/palettes/dark-blue"
    ],
    "related": [
      "/colors/navy",
      "/colors/navy-blue",
      "/colors/ultramarine",
      "/colors/zaffre",
      "/colors/midnight-blue",
      "/compare/dark-blue-vs-navy",
      "/compare/dark-blue-vs-navy-blue",
      "/compare/ultramarine-vs-dark-blue",
      "/harmonies/dark-blue",
      "/wcag/dark-blue",
      "/css/colors/dark-blue",
      "/hex/00008b"
    ]
  }
}
Full JSON dataset 
{
  "slug": "dark-blue",
  "name": "Dark Blue",
  "cssName": "darkblue",
  "hex": "#00008B",
  "family": "blue",
  "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": [
    "darkblue"
  ],
  "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": [
    "blue",
    "cool",
    "jewel-tone",
    "web-design",
    "css-color-systems",
    "ui-prototyping",
    "context-dependent"
  ],
  "popularity": 67,
  "rgb": [
    0,
    0,
    139
  ],
  "hsl": [
    240,
    100,
    27
  ],
  "cmyk": [
    100,
    100,
    0,
    45
  ],
  "luminance": 0.0186,
  "contrast": {
    "black": 1.37,
    "white": 15.31
  },
  "harmonies": {
    "complementary": "#8A8A00",
    "analogous": [
      "#00458A",
      "#45008A"
    ],
    "triadic": [
      "#8A0000",
      "#008A00"
    ],
    "tetradic": [
      "#8A0045",
      "#8A8A00",
      "#008A45"
    ],
    "splitComplementary": [
      "#8A4500",
      "#458A00"
    ],
    "monochromatic": [
      "#0000E6",
      "#00008B",
      "#00002E"
    ]
  },
  "variants": {
    "light": "#0000E6",
    "dark": "#00002E",
    "saturated": "#00008A",
    "desaturated": "#0F0F7B",
    "pastel": "#1D1DED",
    "neon": "#0000B3"
  },
  "wcag": {
    "AA": [
      "#FFFFFF",
      "#F5F5F5"
    ],
    "AAA": [
      "#FFFFFF",
      "#F5F5F5"
    ]
  },
  "css": {
    "variable": "--color-dark-blue: #00008B;",
    "utility": ".bg-dark-blue { background-color: #00008B; }",
    "textUtility": ".text-dark-blue { color: #00008B; }"
  },
  "nearestColors": [
    "navy",
    "navy-blue",
    "ultramarine",
    "zaffre",
    "midnight-blue"
  ],
  "generatedPalettes": [
    "dark-blue"
  ],
  "generatedComparisons": [
    "dark-blue-vs-navy",
    "dark-blue-vs-navy-blue",
    "ultramarine-vs-dark-blue"
  ],
  "relatedFamilies": [
    "/colors/by-family/blue",
    "/colors/by-temperature/cool",
    "/colors/by-tone/jewel-tone"
  ],
  "relatedTools": [
    "/harmonies/dark-blue",
    "/wcag/dark-blue",
    "/css/colors/dark-blue",
    "/hex/00008b"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/blue",
      "/colors/by-temperature/cool",
      "/colors/by-tone/jewel-tone"
    ],
    "narrower": [
      "/palettes/dark-blue"
    ],
    "related": [
      "/colors/navy",
      "/colors/navy-blue",
      "/colors/ultramarine",
      "/colors/zaffre",
      "/colors/midnight-blue",
      "/compare/dark-blue-vs-navy",
      "/compare/dark-blue-vs-navy-blue",
      "/compare/ultramarine-vs-dark-blue",
      "/harmonies/dark-blue",
      "/wcag/dark-blue",
      "/css/colors/dark-blue",
      "/hex/00008b"
    ]
  },
  "pairings": {
    "best": [
      "#FFFFFF",
      "#8A8A00",
      "#00458A",
      "#45008A"
    ],
    "avoid": [
      "#0F0F7B",
      "#0000E6"
    ],
    "neutral": [
      "#1A1A1A",
      "#F5F5F5",
      "#E8E8E4"
    ],
    "highContrast": [
      "#FFFFFF"
    ],
    "lowContrast": [
      "#0000E6",
      "#0F0F7B"
    ]
  }
}
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

Color meaning and use

About Dark Blue Color

Dark Blue sits in the blue family with cool temperature and jewel tone visual character. Standard CSS named color.

Its common associations include context dependent, which makes it relevant for web interfaces and design systems. In design work, Dark Blue is most useful for web design, css color systems, and ui prototyping, especially when paired with white text for stronger contrast.

Related Color Guides

Blue color familyBrowse named blue colors and compare nearby swatches.Cool colorsExplore colors with cool temperature behavior.Jewel Tone colorsFind colors with jewel tone visual character.Dark Blue accessibilityCheck contrast and WCAG text options for #00008B.Dark Blue CSS utilitiesUse Dark Blue in CSS variables and utility classes.#00008B HEX atlasOpen the permanent HEX atlas record for conversions and variants.Dark Blue paletteOpen the generated palette based on Dark Blue.Dark Blue harmoniesExplore complementary, analogous, triadic, and tetradic harmonies.

WCAG Accessibility

Contrast checks for Dark Blue against black and white text.

Black text1.37:1AA Fail
White text15.31:1AA Pass
AA text options#FFFFFF, #F5F5F5
AAA text options#FFFFFF, #F5F5F5
Open WCAG pageDetailed contrast notes, warnings, alternatives, and UI examples

Similar Colors

Navy#000080
Navy Blue#000080
Ultramarine#120A8F
Zaffre#0014A8
Midnight Blue#191970

Color Harmonies

#8A8A00#8A8A00
#00458A#00458A
#45008A#45008A
#8A0000#8A0000
#008A00#008A00
Open full Dark Blue harmony pageComplementary, analogous, triadic, tetradic, split, and monochromatic sets

Variants

#0000E6#0000E6
#00002E#00002E
#00008A#00008A
#0F0F7B#0F0F7B
#1D1DED#1D1DED
#0000B3#0000B3

Pairings

White#FFFFFF
#8A8A00#8A8A00
#00458A#00458A
#45008A#45008A
Matte Black#1A1A1A
White Smoke#F5F5F5