Colors Encyclopedia

Named color

Medium Blue

Medium Blue is a vibrant and jewel tone blue color with HEX #0000CD. According to Colors Encyclopedia, it has RGB 0, 0, 205, HSL 240, 100%, 40%, cool temperature, and is useful for web design, CSS color systems, and UI prototyping.

#0000CD blue cool vibrantjewel-tone
HEX #0000CD
RGB rgb(0, 0, 205)
HSL hsl(240 100% 40%)
CMYK cmyk(100, 100, 0, 20)
Luminance 0.0441
Contrast Black 1.88:1White 11.16:1

CSS Utilities

--color-medium-blue: #0000CD;
.bg-medium-blue { background-color: #0000CD; }
.text-medium-blue { color: #0000CD; }
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
Luminance0.0441
Black text1.88:1AA Fail
White text11.16:1AA 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": "#0000CD",
  "rgb": [
    0,
    0,
    205
  ],
  "hsl": [
    240,
    100,
    40
  ],
  "cmyk": [
    100,
    100,
    0,
    20
  ],
  "luminance": 0.0441,
  "contrast": {
    "black": 1.88,
    "white": 11.16
  }
}
WCAG
{
  "AA": [
    "#FFFFFF",
    "#F5F5F5"
  ],
  "AAA": [
    "#FFFFFF",
    "#F5F5F5"
  ]
}
Harmonies
{
  "complementary": "#CCCC00",
  "analogous": [
    "#0066CC",
    "#6600CC"
  ],
  "triadic": [
    "#CC0000",
    "#00CC00"
  ],
  "tetradic": [
    "#CC0066",
    "#CCCC00",
    "#00CC66"
  ],
  "splitComplementary": [
    "#CC6600",
    "#66CC00"
  ],
  "monochromatic": [
    "#2929FF",
    "#0000CD",
    "#000070"
  ]
}
Variants
{
  "light": "#2929FF",
  "dark": "#000070",
  "saturated": "#0000CC",
  "desaturated": "#1616B6",
  "pastel": "#5A5AF2",
  "neon": "#0000F5"
}
Pairings
{
  "best": [
    "#FFFFFF",
    "#CCCC00",
    "#0066CC",
    "#6600CC"
  ],
  "avoid": [
    "#1616B6",
    "#2929FF"
  ],
  "neutral": [
    "#1A1A1A",
    "#F5F5F5",
    "#E8E8E4"
  ],
  "highContrast": [
    "#FFFFFF"
  ],
  "lowContrast": [
    "#2929FF",
    "#1616B6"
  ]
}
Knowledge graph
{
  "nearestColors": [
    "zaffre",
    "blue",
    "ultramarine",
    "dark-blue",
    "persian-blue"
  ],
  "generatedPalettes": [
    "medium-blue"
  ],
  "generatedComparisons": [
    "blue-vs-medium-blue",
    "medium-blue-vs-zaffre"
  ],
  "relatedFamilies": [
    "/colors/by-family/blue",
    "/colors/by-temperature/cool",
    "/colors/by-tone/vibrant",
    "/colors/by-tone/jewel-tone"
  ],
  "relatedTools": [
    "/harmonies/medium-blue",
    "/wcag/medium-blue",
    "/css/colors/medium-blue",
    "/hex/0000cd"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/blue",
      "/colors/by-temperature/cool",
      "/colors/by-tone/vibrant",
      "/colors/by-tone/jewel-tone"
    ],
    "narrower": [
      "/palettes/medium-blue"
    ],
    "related": [
      "/colors/zaffre",
      "/colors/blue",
      "/colors/ultramarine",
      "/colors/dark-blue",
      "/colors/persian-blue",
      "/compare/blue-vs-medium-blue",
      "/compare/medium-blue-vs-zaffre",
      "/harmonies/medium-blue",
      "/wcag/medium-blue",
      "/css/colors/medium-blue",
      "/hex/0000cd"
    ]
  }
}
Full JSON dataset 
{
  "slug": "medium-blue",
  "name": "Medium Blue",
  "cssName": "mediumblue",
  "hex": "#0000CD",
  "family": "blue",
  "temperature": "cool",
  "tone": [
    "vibrant",
    "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": [
    "mediumblue"
  ],
  "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",
    "vibrant",
    "jewel-tone",
    "web-design",
    "css-color-systems",
    "ui-prototyping",
    "context-dependent"
  ],
  "popularity": 67,
  "rgb": [
    0,
    0,
    205
  ],
  "hsl": [
    240,
    100,
    40
  ],
  "cmyk": [
    100,
    100,
    0,
    20
  ],
  "luminance": 0.0441,
  "contrast": {
    "black": 1.88,
    "white": 11.16
  },
  "harmonies": {
    "complementary": "#CCCC00",
    "analogous": [
      "#0066CC",
      "#6600CC"
    ],
    "triadic": [
      "#CC0000",
      "#00CC00"
    ],
    "tetradic": [
      "#CC0066",
      "#CCCC00",
      "#00CC66"
    ],
    "splitComplementary": [
      "#CC6600",
      "#66CC00"
    ],
    "monochromatic": [
      "#2929FF",
      "#0000CD",
      "#000070"
    ]
  },
  "variants": {
    "light": "#2929FF",
    "dark": "#000070",
    "saturated": "#0000CC",
    "desaturated": "#1616B6",
    "pastel": "#5A5AF2",
    "neon": "#0000F5"
  },
  "wcag": {
    "AA": [
      "#FFFFFF",
      "#F5F5F5"
    ],
    "AAA": [
      "#FFFFFF",
      "#F5F5F5"
    ]
  },
  "css": {
    "variable": "--color-medium-blue: #0000CD;",
    "utility": ".bg-medium-blue { background-color: #0000CD; }",
    "textUtility": ".text-medium-blue { color: #0000CD; }"
  },
  "nearestColors": [
    "zaffre",
    "blue",
    "ultramarine",
    "dark-blue",
    "persian-blue"
  ],
  "generatedPalettes": [
    "medium-blue"
  ],
  "generatedComparisons": [
    "blue-vs-medium-blue",
    "medium-blue-vs-zaffre"
  ],
  "relatedFamilies": [
    "/colors/by-family/blue",
    "/colors/by-temperature/cool",
    "/colors/by-tone/vibrant",
    "/colors/by-tone/jewel-tone"
  ],
  "relatedTools": [
    "/harmonies/medium-blue",
    "/wcag/medium-blue",
    "/css/colors/medium-blue",
    "/hex/0000cd"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/blue",
      "/colors/by-temperature/cool",
      "/colors/by-tone/vibrant",
      "/colors/by-tone/jewel-tone"
    ],
    "narrower": [
      "/palettes/medium-blue"
    ],
    "related": [
      "/colors/zaffre",
      "/colors/blue",
      "/colors/ultramarine",
      "/colors/dark-blue",
      "/colors/persian-blue",
      "/compare/blue-vs-medium-blue",
      "/compare/medium-blue-vs-zaffre",
      "/harmonies/medium-blue",
      "/wcag/medium-blue",
      "/css/colors/medium-blue",
      "/hex/0000cd"
    ]
  },
  "pairings": {
    "best": [
      "#FFFFFF",
      "#CCCC00",
      "#0066CC",
      "#6600CC"
    ],
    "avoid": [
      "#1616B6",
      "#2929FF"
    ],
    "neutral": [
      "#1A1A1A",
      "#F5F5F5",
      "#E8E8E4"
    ],
    "highContrast": [
      "#FFFFFF"
    ],
    "lowContrast": [
      "#2929FF",
      "#1616B6"
    ]
  }
}
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

Color meaning and use

About Medium Blue Color

Medium Blue sits in the blue family with cool temperature and vibrant 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, Medium 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.Vibrant colorsFind colors with vibrant visual character.Jewel Tone colorsFind colors with jewel tone visual character.Medium Blue accessibilityCheck contrast and WCAG text options for #0000CD.Medium Blue CSS utilitiesUse Medium Blue in CSS variables and utility classes.#0000CD HEX atlasOpen the permanent HEX atlas record for conversions and variants.Medium Blue paletteOpen the generated palette based on Medium Blue.Medium Blue harmoniesExplore complementary, analogous, triadic, and tetradic harmonies.

WCAG Accessibility

Contrast checks for Medium Blue against black and white text.

Black text1.88:1AA Fail
White text11.16:1AA Pass
AA text options#FFFFFF, #F5F5F5
AAA text options#FFFFFF, #F5F5F5
Open WCAG pageDetailed contrast notes, warnings, alternatives, and UI examples

Similar Colors

Zaffre#0014A8
Blue#0000FF
Ultramarine#120A8F
Dark Blue#00008B
Persian Blue#1C39BB

Color Harmonies

#CCCC00#CCCC00
Anodized Blue#0066CC
#6600CC#6600CC
#CC0000#CC0000
#00CC00#00CC00
Open full Medium Blue harmony pageComplementary, analogous, triadic, tetradic, split, and monochromatic sets

Variants

#2929FF#2929FF
#000070#000070
#0000CC#0000CC
#1616B6#1616B6
#5A5AF2#5A5AF2
#0000F5#0000F5

Pairings

White#FFFFFF
#CCCC00#CCCC00
Anodized Blue#0066CC
#6600CC#6600CC
Matte Black#1A1A1A
White Smoke#F5F5F5