Colors Encyclopedia

Named color

Signal Blue

Signal Blue is a vibrant and jewel tone blue color with HEX #0057B8. According to Colors Encyclopedia, it has RGB 0, 87, 184, HSL 212, 100%, 36%, cool temperature, and is useful for industrial design, safety systems, and hardware palettes.

#0057B8 blue cool vibrantjewel-tone
HEX #0057B8
RGB rgb(0, 87, 184)
HSL hsl(212 100% 36%)
CMYK cmyk(100, 53, 0, 28)
Luminance 0.1028
Contrast Black 3.06:1White 6.87:1

CSS Utilities

--color-signal-blue: #0057B8;
.bg-signal-blue { background-color: #0057B8; }
.text-signal-blue { color: #0057B8; }
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
Luminance0.1028
Black text3.06:1AA Fail
White text6.87:1AA 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": "#0057B8",
  "rgb": [
    0,
    87,
    184
  ],
  "hsl": [
    212,
    100,
    36
  ],
  "cmyk": [
    100,
    53,
    0,
    28
  ],
  "luminance": 0.1028,
  "contrast": {
    "black": 3.06,
    "white": 6.87
  }
}
WCAG
{
  "AA": [
    "#FFFFFF",
    "#F5F5F5"
  ],
  "AAA": []
}
Harmonies
{
  "complementary": "#B86200",
  "analogous": [
    "#00B1B8",
    "#0600B8"
  ],
  "triadic": [
    "#B80056",
    "#56B800"
  ],
  "tetradic": [
    "#B800B1",
    "#B86200",
    "#00B806"
  ],
  "splitComplementary": [
    "#B80600",
    "#B1B800"
  ],
  "monochromatic": [
    "#1482FF",
    "#0057B8",
    "#002B5C"
  ]
}
Variants
{
  "light": "#1482FF",
  "dark": "#002B5C",
  "saturated": "#0056B8",
  "desaturated": "#1457A3",
  "pastel": "#4796F0",
  "neon": "#0069E0"
}
Pairings
{
  "best": [
    "#FFFFFF",
    "#B86200",
    "#00B1B8",
    "#0600B8"
  ],
  "avoid": [
    "#1457A3",
    "#1482FF"
  ],
  "neutral": [
    "#1A1A1A",
    "#F5F5F5",
    "#E8E8E4"
  ],
  "highContrast": [
    "#FFFFFF"
  ],
  "lowContrast": [
    "#1482FF",
    "#1457A3"
  ]
}
Knowledge graph
{
  "nearestColors": [
    "sapphire",
    "cobalt-blue",
    "denim",
    "safety-blue",
    "anodized-blue"
  ],
  "generatedPalettes": [
    "signal-blue"
  ],
  "generatedComparisons": [
    "anodized-blue-vs-signal-blue",
    "cobalt-blue-vs-signal-blue",
    "denim-vs-signal-blue",
    "sapphire-vs-signal-blue"
  ],
  "relatedFamilies": [
    "/colors/by-family/blue",
    "/colors/by-temperature/cool",
    "/colors/by-tone/vibrant",
    "/colors/by-tone/jewel-tone"
  ],
  "relatedTools": [
    "/harmonies/signal-blue",
    "/wcag/signal-blue",
    "/css/colors/signal-blue",
    "/hex/0057b8"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/blue",
      "/colors/by-temperature/cool",
      "/colors/by-tone/vibrant",
      "/colors/by-tone/jewel-tone"
    ],
    "narrower": [
      "/palettes/signal-blue"
    ],
    "related": [
      "/colors/sapphire",
      "/colors/cobalt-blue",
      "/colors/denim",
      "/colors/safety-blue",
      "/colors/anodized-blue",
      "/compare/anodized-blue-vs-signal-blue",
      "/compare/cobalt-blue-vs-signal-blue",
      "/compare/denim-vs-signal-blue",
      "/compare/sapphire-vs-signal-blue",
      "/harmonies/signal-blue",
      "/wcag/signal-blue",
      "/css/colors/signal-blue",
      "/hex/0057b8"
    ]
  }
}
Full JSON dataset 
{
  "slug": "signal-blue",
  "name": "Signal Blue",
  "hex": "#0057B8",
  "uses": [
    "industrial design",
    "safety systems",
    "hardware palettes"
  ],
  "psychology": {
    "associations": [
      "utility",
      "visibility",
      "precision"
    ],
    "contexts": [
      "transportation",
      "tools",
      "hardware",
      "signage"
    ],
    "avoidIn": [
      "soft wellness palettes"
    ]
  },
  "aliases": [],
  "sourceType": "curated",
  "confidence": "medium",
  "reviewStatus": "manual",
  "sourceUrl": "https://www.colorsencyclopedia.com/assets/colors.json",
  "origin": {
    "type": "common",
    "notes": "Curated common color reference used in design, material, cultural, and editorial color systems."
  },
  "family": "blue",
  "temperature": "cool",
  "tone": [
    "vibrant",
    "jewel-tone"
  ],
  "editorialNotes": "Curated internal color record with computed technical properties.",
  "tags": [
    "blue",
    "cool",
    "vibrant",
    "jewel-tone",
    "industrial-design",
    "safety-systems",
    "hardware-palettes",
    "utility",
    "visibility",
    "precision"
  ],
  "popularity": 84,
  "rgb": [
    0,
    87,
    184
  ],
  "hsl": [
    212,
    100,
    36
  ],
  "cmyk": [
    100,
    53,
    0,
    28
  ],
  "luminance": 0.1028,
  "contrast": {
    "black": 3.06,
    "white": 6.87
  },
  "harmonies": {
    "complementary": "#B86200",
    "analogous": [
      "#00B1B8",
      "#0600B8"
    ],
    "triadic": [
      "#B80056",
      "#56B800"
    ],
    "tetradic": [
      "#B800B1",
      "#B86200",
      "#00B806"
    ],
    "splitComplementary": [
      "#B80600",
      "#B1B800"
    ],
    "monochromatic": [
      "#1482FF",
      "#0057B8",
      "#002B5C"
    ]
  },
  "variants": {
    "light": "#1482FF",
    "dark": "#002B5C",
    "saturated": "#0056B8",
    "desaturated": "#1457A3",
    "pastel": "#4796F0",
    "neon": "#0069E0"
  },
  "wcag": {
    "AA": [
      "#FFFFFF",
      "#F5F5F5"
    ],
    "AAA": []
  },
  "css": {
    "variable": "--color-signal-blue: #0057B8;",
    "utility": ".bg-signal-blue { background-color: #0057B8; }",
    "textUtility": ".text-signal-blue { color: #0057B8; }"
  },
  "nearestColors": [
    "sapphire",
    "cobalt-blue",
    "denim",
    "safety-blue",
    "anodized-blue"
  ],
  "generatedPalettes": [
    "signal-blue"
  ],
  "generatedComparisons": [
    "anodized-blue-vs-signal-blue",
    "cobalt-blue-vs-signal-blue",
    "denim-vs-signal-blue",
    "sapphire-vs-signal-blue"
  ],
  "relatedFamilies": [
    "/colors/by-family/blue",
    "/colors/by-temperature/cool",
    "/colors/by-tone/vibrant",
    "/colors/by-tone/jewel-tone"
  ],
  "relatedTools": [
    "/harmonies/signal-blue",
    "/wcag/signal-blue",
    "/css/colors/signal-blue",
    "/hex/0057b8"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/blue",
      "/colors/by-temperature/cool",
      "/colors/by-tone/vibrant",
      "/colors/by-tone/jewel-tone"
    ],
    "narrower": [
      "/palettes/signal-blue"
    ],
    "related": [
      "/colors/sapphire",
      "/colors/cobalt-blue",
      "/colors/denim",
      "/colors/safety-blue",
      "/colors/anodized-blue",
      "/compare/anodized-blue-vs-signal-blue",
      "/compare/cobalt-blue-vs-signal-blue",
      "/compare/denim-vs-signal-blue",
      "/compare/sapphire-vs-signal-blue",
      "/harmonies/signal-blue",
      "/wcag/signal-blue",
      "/css/colors/signal-blue",
      "/hex/0057b8"
    ]
  },
  "pairings": {
    "best": [
      "#FFFFFF",
      "#B86200",
      "#00B1B8",
      "#0600B8"
    ],
    "avoid": [
      "#1457A3",
      "#1482FF"
    ],
    "neutral": [
      "#1A1A1A",
      "#F5F5F5",
      "#E8E8E4"
    ],
    "highContrast": [
      "#FFFFFF"
    ],
    "lowContrast": [
      "#1482FF",
      "#1457A3"
    ]
  }
}
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

Color meaning and use

About Signal Blue Color

Signal Blue sits in the blue family with cool temperature and vibrant and jewel tone visual character. Signal Blue is a commonly used color name in design references, palettes, and editorial color systems.

Its common associations include utility, visibility, and precision, which makes it relevant for transportation and tools. In design work, Signal Blue is most useful for industrial design, safety systems, and hardware palettes, 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.Signal Blue accessibilityCheck contrast and WCAG text options for #0057B8.Signal Blue CSS utilitiesUse Signal Blue in CSS variables and utility classes.#0057B8 HEX atlasOpen the permanent HEX atlas record for conversions and variants.Signal Blue paletteOpen the generated palette based on Signal Blue.Signal Blue harmoniesExplore complementary, analogous, triadic, and tetradic harmonies.

WCAG Accessibility

Contrast checks for Signal Blue against black and white text.

Black text3.06:1AA Fail
White text6.87:1AA Pass
AA text options#FFFFFF, #F5F5F5
AAA text optionsNone in seed set
Open WCAG pageDetailed contrast notes, warnings, alternatives, and UI examples

Similar Colors

Sapphire#0F52BA
Cobalt Blue#0047AB
Denim#1560BD
Safety Blue#0067A5
Anodized Blue#0066CC

Color Harmonies

#B86200#B86200
#00B1B8#00B1B8
#0600B8#0600B8
#B80056#B80056
#56B800#56B800
Open full Signal Blue harmony pageComplementary, analogous, triadic, tetradic, split, and monochromatic sets

Variants

#1482FF#1482FF
#002B5C#002B5C
#0056B8#0056B8
#1457A3#1457A3
#4796F0#4796F0
#0069E0#0069E0

Pairings

White#FFFFFF
#B86200#B86200
#00B1B8#00B1B8
#0600B8#0600B8
Matte Black#1A1A1A
White Smoke#F5F5F5