Named color

Red

Red is a vibrant red color with HEX #FF0000. According to Colors Encyclopedia, it has RGB 255, 0, 0, HSL 0, 100%, 50%, warm temperature, and is useful for web design, CSS color systems, and UI prototyping.

#FF0000 red warm vibrant

HEX #FF0000

RGB rgb(255, 0, 0)

HSL hsl(0 100% 50%)

CMYK cmyk(0, 100, 100, 0)

Luminance 0.2126

Contrast Black 5.25:1White 4:1

CSS Utilities

--color-red: #FF0000;
.bg-red { background-color: #FF0000; }
.text-red { color: #FF0000; }

Open CSS utility pageReusable variables, classes, examples, and implementation notes

Luminance0.2126

Black text5.25:1AA Pass

White text4:1AA Fail

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

Structured sections

Color systems

{
  "hex": "#FF0000",
  "rgb": [
    255,
    0,
    0
  ],
  "hsl": [
    0,
    100,
    50
  ],
  "cmyk": [
    0,
    100,
    100,
    0
  ],
  "luminance": 0.2126,
  "contrast": {
    "black": 5.25,
    "white": 4
  }
}

WCAG

{
  "AA": [
    "#000000"
  ],
  "AAA": []
}

Harmonies

{
  "complementary": "#00FFFF",
  "analogous": [
    "#FF0080",
    "#FF8000"
  ],
  "triadic": [
    "#00FF00",
    "#0000FF"
  ],
  "tetradic": [
    "#80FF00",
    "#00FFFF",
    "#7F00FF"
  ],
  "splitComplementary": [
    "#00FF80",
    "#007FFF"
  ],
  "monochromatic": [
    "#FF5C5C",
    "#FF0000",
    "#A30000"
  ]
}

Variants

{
  "light": "#FF5C5C",
  "dark": "#A30000",
  "saturated": "#FF0000",
  "desaturated": "#E31C1C",
  "pastel": "#F58989",
  "neon": "#FF2929"
}

Pairings

{
  "best": [
    "#000000",
    "#00FFFF",
    "#FF0080",
    "#FF8000"
  ],
  "avoid": [
    "#E31C1C",
    "#FF5C5C"
  ],
  "neutral": [
    "#1A1A1A",
    "#F5F5F5",
    "#E8E8E4"
  ],
  "highContrast": [
    "#000000"
  ],
  "lowContrast": [
    "#FF5C5C",
    "#E31C1C"
  ]
}

Knowledge graph

{
  "nearestColors": [
    "signal-red",
    "scarlet",
    "cadmium-red",
    "traffic-red",
    "neon-red"
  ],
  "generatedPalettes": [
    "red"
  ],
  "generatedComparisons": [
    "red-vs-scarlet",
    "red-vs-signal-red"
  ],
  "relatedFamilies": [
    "/colors/by-family/red",
    "/colors/by-temperature/warm",
    "/colors/by-tone/vibrant"
  ],
  "relatedTools": [
    "/harmonies/red",
    "/wcag/red",
    "/css/colors/red",
    "/hex/ff0000"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/red",
      "/colors/by-temperature/warm",
      "/colors/by-tone/vibrant"
    ],
    "narrower": [
      "/palettes/red"
    ],
    "related": [
      "/colors/signal-red",
      "/colors/scarlet",
      "/colors/cadmium-red",
      "/colors/traffic-red",
      "/colors/neon-red",
      "/compare/red-vs-scarlet",
      "/compare/red-vs-signal-red",
      "/harmonies/red",
      "/wcag/red",
      "/css/colors/red",
      "/hex/ff0000"
    ]
  }
}

Full JSON dataset

{
  "slug": "red",
  "name": "Red",
  "cssName": "red",
  "hex": "#FF0000",
  "family": "red",
  "temperature": "warm",
  "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": [
    "red"
  ],
  "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": [
    "red",
    "warm",
    "vibrant",
    "web-design",
    "css-color-systems",
    "ui-prototyping",
    "context-dependent"
  ],
  "popularity": 82,
  "rgb": [
    255,
    0,
    0
  ],
  "hsl": [
    0,
    100,
    50
  ],
  "cmyk": [
    0,
    100,
    100,
    0
  ],
  "luminance": 0.2126,
  "contrast": {
    "black": 5.25,
    "white": 4
  },
  "harmonies": {
    "complementary": "#00FFFF",
    "analogous": [
      "#FF0080",
      "#FF8000"
    ],
    "triadic": [
      "#00FF00",
      "#0000FF"
    ],
    "tetradic": [
      "#80FF00",
      "#00FFFF",
      "#7F00FF"
    ],
    "splitComplementary": [
      "#00FF80",
      "#007FFF"
    ],
    "monochromatic": [
      "#FF5C5C",
      "#FF0000",
      "#A30000"
    ]
  },
  "variants": {
    "light": "#FF5C5C",
    "dark": "#A30000",
    "saturated": "#FF0000",
    "desaturated": "#E31C1C",
    "pastel": "#F58989",
    "neon": "#FF2929"
  },
  "wcag": {
    "AA": [
      "#000000"
    ],
    "AAA": []
  },
  "css": {
    "variable": "--color-red: #FF0000;",
    "utility": ".bg-red { background-color: #FF0000; }",
    "textUtility": ".text-red { color: #FF0000; }"
  },
  "nearestColors": [
    "signal-red",
    "scarlet",
    "cadmium-red",
    "traffic-red",
    "neon-red"
  ],
  "generatedPalettes": [
    "red"
  ],
  "generatedComparisons": [
    "red-vs-scarlet",
    "red-vs-signal-red"
  ],
  "relatedFamilies": [
    "/colors/by-family/red",
    "/colors/by-temperature/warm",
    "/colors/by-tone/vibrant"
  ],
  "relatedTools": [
    "/harmonies/red",
    "/wcag/red",
    "/css/colors/red",
    "/hex/ff0000"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/red",
      "/colors/by-temperature/warm",
      "/colors/by-tone/vibrant"
    ],
    "narrower": [
      "/palettes/red"
    ],
    "related": [
      "/colors/signal-red",
      "/colors/scarlet",
      "/colors/cadmium-red",
      "/colors/traffic-red",
      "/colors/neon-red",
      "/compare/red-vs-scarlet",
      "/compare/red-vs-signal-red",
      "/harmonies/red",
      "/wcag/red",
      "/css/colors/red",
      "/hex/ff0000"
    ]
  },
  "pairings": {
    "best": [
      "#000000",
      "#00FFFF",
      "#FF0080",
      "#FF8000"
    ],
    "avoid": [
      "#E31C1C",
      "#FF5C5C"
    ],
    "neutral": [
      "#1A1A1A",
      "#F5F5F5",
      "#E8E8E4"
    ],
    "highContrast": [
      "#000000"
    ],
    "lowContrast": [
      "#FF5C5C",
      "#E31C1C"
    ]
  }
}

Color meaning and use

About Red Color

Red sits in the red family with warm 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, Red is most useful for web design, css color systems, and ui prototyping, especially when paired with black text for stronger contrast.

WCAG Accessibility

Contrast checks for Red against black and white text.

Black text5.25:1AA Pass

White text4:1AA Fail

AA text options#000000

AAA text optionsNone in seed set

Open WCAG pageDetailed contrast notes, warnings, alternatives, and UI examples

Similar Colors

Signal Red#E60000

Scarlet#FF2400

Cadmium Red#E30022

Traffic Red#CC0605

Neon Red#FF073A

Color Harmonies

Cyan#00FFFF

#FF0080#FF0080

#FF8000#FF8000

Lime#00FF00

Blue#0000FF

Open full Red harmony pageComplementary, analogous, triadic, tetradic, split, and monochromatic sets

Variants

#FF5C5C#FF5C5C

#A30000#A30000

Red#FF0000

#E31C1C#E31C1C

#F58989#F58989

#FF2929#FF2929

Pairings

Black#000000

Cyan#00FFFF

#FF0080#FF0080

#FF8000#FF8000

Matte Black#1A1A1A

White Smoke#F5F5F5

Red

CSS Utilities

Machine-Readable Color Data (JSON)

About Red Color

Related Color Guides

WCAG Accessibility

Similar Colors

Color Harmonies

Variants

Pairings