Colors Encyclopedia

Named color

Royal Blue

Royal Blue is a vibrant blue color with HEX #4169E1. According to Colors Encyclopedia, it has RGB 65, 105, 225, HSL 225, 73%, 57%, cool temperature, and is useful for web design, CSS color systems, and UI prototyping.

#4169E1 blue cool vibrant
HEX #4169E1
RGB rgb(65, 105, 225)
HSL hsl(225 73% 57%)
CMYK cmyk(71, 53, 0, 12)
Luminance 0.1666
Contrast Black 4.33:1White 4.85:1

CSS Utilities

--color-royal-blue: #4169E1;
.bg-royal-blue { background-color: #4169E1; }
.text-royal-blue { color: #4169E1; }
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
Luminance0.1666
Black text4.33:1AA Fail
White text4.85:1AA 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": "#4169E1",
  "rgb": [
    65,
    105,
    225
  ],
  "hsl": [
    225,
    73,
    57
  ],
  "cmyk": [
    71,
    53,
    0,
    12
  ],
  "luminance": 0.1666,
  "contrast": {
    "black": 4.33,
    "white": 4.85
  }
}
WCAG
{
  "AA": [
    "#FFFFFF"
  ],
  "AAA": []
}
Harmonies
{
  "complementary": "#E1B941",
  "analogous": [
    "#41B9E1",
    "#6941E1"
  ],
  "triadic": [
    "#E14169",
    "#69E141"
  ],
  "tetradic": [
    "#E141B9",
    "#E1B941",
    "#41E169"
  ],
  "splitComplementary": [
    "#E16941",
    "#B9E141"
  ],
  "monochromatic": [
    "#91A8EE",
    "#4169E1",
    "#1B3FAC"
  ]
}
Variants
{
  "light": "#91A8EE",
  "dark": "#1B3FAC",
  "saturated": "#295DFA",
  "desaturated": "#5975C9",
  "pastel": "#B6C4EC",
  "neon": "#4D79FF"
}
Pairings
{
  "best": [
    "#FFFFFF",
    "#E1B941",
    "#41B9E1",
    "#6941E1"
  ],
  "avoid": [
    "#5975C9",
    "#91A8EE"
  ],
  "neutral": [
    "#1A1A1A",
    "#F5F5F5",
    "#E8E8E4"
  ],
  "highContrast": [
    "#FFFFFF"
  ],
  "lowContrast": [
    "#91A8EE",
    "#5975C9"
  ]
}
Knowledge graph
{
  "nearestColors": [
    "iris",
    "slate-blue",
    "neon-blue",
    "steel-blue",
    "zircon-blue"
  ],
  "generatedPalettes": [
    "royal-blue"
  ],
  "generatedComparisons": [
    "iris-vs-royal-blue",
    "neon-blue-vs-royal-blue",
    "royal-blue-vs-slate-blue"
  ],
  "relatedFamilies": [
    "/colors/by-family/blue",
    "/colors/by-temperature/cool",
    "/colors/by-tone/vibrant"
  ],
  "relatedTools": [
    "/harmonies/royal-blue",
    "/wcag/royal-blue",
    "/css/colors/royal-blue",
    "/hex/4169e1"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/blue",
      "/colors/by-temperature/cool",
      "/colors/by-tone/vibrant"
    ],
    "narrower": [
      "/palettes/royal-blue"
    ],
    "related": [
      "/colors/iris",
      "/colors/slate-blue",
      "/colors/neon-blue",
      "/colors/steel-blue",
      "/colors/zircon-blue",
      "/compare/iris-vs-royal-blue",
      "/compare/neon-blue-vs-royal-blue",
      "/compare/royal-blue-vs-slate-blue",
      "/harmonies/royal-blue",
      "/wcag/royal-blue",
      "/css/colors/royal-blue",
      "/hex/4169e1"
    ]
  }
}
Full JSON dataset 
{
  "slug": "royal-blue",
  "name": "Royal Blue",
  "cssName": "royalblue",
  "hex": "#4169E1",
  "family": "blue",
  "temperature": "cool",
  "tone": [
    "vibrant"
  ],
  "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": [
    "royalblue"
  ],
  "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",
    "web-design",
    "css-color-systems",
    "ui-prototyping",
    "context-dependent"
  ],
  "popularity": 67,
  "rgb": [
    65,
    105,
    225
  ],
  "hsl": [
    225,
    73,
    57
  ],
  "cmyk": [
    71,
    53,
    0,
    12
  ],
  "luminance": 0.1666,
  "contrast": {
    "black": 4.33,
    "white": 4.85
  },
  "harmonies": {
    "complementary": "#E1B941",
    "analogous": [
      "#41B9E1",
      "#6941E1"
    ],
    "triadic": [
      "#E14169",
      "#69E141"
    ],
    "tetradic": [
      "#E141B9",
      "#E1B941",
      "#41E169"
    ],
    "splitComplementary": [
      "#E16941",
      "#B9E141"
    ],
    "monochromatic": [
      "#91A8EE",
      "#4169E1",
      "#1B3FAC"
    ]
  },
  "variants": {
    "light": "#91A8EE",
    "dark": "#1B3FAC",
    "saturated": "#295DFA",
    "desaturated": "#5975C9",
    "pastel": "#B6C4EC",
    "neon": "#4D79FF"
  },
  "wcag": {
    "AA": [
      "#FFFFFF"
    ],
    "AAA": []
  },
  "css": {
    "variable": "--color-royal-blue: #4169E1;",
    "utility": ".bg-royal-blue { background-color: #4169E1; }",
    "textUtility": ".text-royal-blue { color: #4169E1; }"
  },
  "nearestColors": [
    "iris",
    "slate-blue",
    "neon-blue",
    "steel-blue",
    "zircon-blue"
  ],
  "generatedPalettes": [
    "royal-blue"
  ],
  "generatedComparisons": [
    "iris-vs-royal-blue",
    "neon-blue-vs-royal-blue",
    "royal-blue-vs-slate-blue"
  ],
  "relatedFamilies": [
    "/colors/by-family/blue",
    "/colors/by-temperature/cool",
    "/colors/by-tone/vibrant"
  ],
  "relatedTools": [
    "/harmonies/royal-blue",
    "/wcag/royal-blue",
    "/css/colors/royal-blue",
    "/hex/4169e1"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/blue",
      "/colors/by-temperature/cool",
      "/colors/by-tone/vibrant"
    ],
    "narrower": [
      "/palettes/royal-blue"
    ],
    "related": [
      "/colors/iris",
      "/colors/slate-blue",
      "/colors/neon-blue",
      "/colors/steel-blue",
      "/colors/zircon-blue",
      "/compare/iris-vs-royal-blue",
      "/compare/neon-blue-vs-royal-blue",
      "/compare/royal-blue-vs-slate-blue",
      "/harmonies/royal-blue",
      "/wcag/royal-blue",
      "/css/colors/royal-blue",
      "/hex/4169e1"
    ]
  },
  "pairings": {
    "best": [
      "#FFFFFF",
      "#E1B941",
      "#41B9E1",
      "#6941E1"
    ],
    "avoid": [
      "#5975C9",
      "#91A8EE"
    ],
    "neutral": [
      "#1A1A1A",
      "#F5F5F5",
      "#E8E8E4"
    ],
    "highContrast": [
      "#FFFFFF"
    ],
    "lowContrast": [
      "#91A8EE",
      "#5975C9"
    ]
  }
}
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

Color meaning and use

About Royal Blue Color

Royal Blue sits in the blue family with cool temperature and vibrant 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, Royal 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.Royal Blue accessibilityCheck contrast and WCAG text options for #4169E1.Royal Blue CSS utilitiesUse Royal Blue in CSS variables and utility classes.#4169E1 HEX atlasOpen the permanent HEX atlas record for conversions and variants.Royal Blue paletteOpen the generated palette based on Royal Blue.Royal Blue harmoniesExplore complementary, analogous, triadic, and tetradic harmonies.

WCAG Accessibility

Contrast checks for Royal Blue against black and white text.

Black text4.33:1AA Fail
White text4.85:1AA Pass
AA text options#FFFFFF
AAA text optionsNone in seed set
Open WCAG pageDetailed contrast notes, warnings, alternatives, and UI examples

Similar Colors

Iris#5A4FCF
Slate Blue#6A5ACD
Neon Blue#1F51FF
Steel Blue#4682B4
Zircon Blue#2D9CDB

Color Harmonies

#E1B941#E1B941
#41B9E1#41B9E1
#6941E1#6941E1
#E14169#E14169
#69E141#69E141
Open full Royal Blue harmony pageComplementary, analogous, triadic, tetradic, split, and monochromatic sets

Variants

#91A8EE#91A8EE
#1B3FAC#1B3FAC
#295DFA#295DFA
#5975C9#5975C9
#B6C4EC#B6C4EC
#4D79FF#4D79FF

Pairings

White#FFFFFF
#E1B941#E1B941
#41B9E1#41B9E1
#6941E1#6941E1
Matte Black#1A1A1A
White Smoke#F5F5F5