Nearest-color comparison

Sapphire vs Signal Blue

Sapphire and Signal Blue are different blue colors with HEX values #0F52BA and #0057B8. According to Colors Encyclopedia, their RGB distance is 15.9, their contrast ratio is 1.04:1, and the comparison helps choose between tone, temperature, and accessibility behavior.

Sapphire and Signal Blue are very close colors. Signal Blue is the lighter option. They share similar temperature behavior. Their mutual contrast is 1.04:1, so the pair is too low for text and better treated as a palette relationship.

Differences Use cases Accessibility JSON

Sapphire#0F52BA

Signal Blue#0057B8

Quick Difference Summary

The main measurable differences between Sapphire and Signal Blue across RGB distance, luminance, hue, saturation, and contrast.

RGB distance15.9

Pair contrast1.04:1

Luminance delta0.006

Hue delta4 deg

Lighter colorSignal Blue

More saturatedSignal Blue

Side-by-Side Color Profiles

blue color

Sapphire

Sapphire is #0F52BA, a cool blue color with vibrant and jewel tone character. Compared with Signal Blue, it is darker and less saturated. Use it for interfaces, brand systems, and technical design, with white text as the safer foreground option.

HEX#0F52BA RGB15, 82, 186 HSL216, 85, 39 CMYK92, 56, 0, 27 Luminance0.0968 Best textwhite text

Color page WCAG HEX atlas

blue color

Signal Blue

Signal Blue is #0057B8, a cool blue color with vibrant and jewel tone character. Compared with Sapphire, it is lighter and more saturated. Use it for industrial design, safety systems, and hardware palettes, with white text as the safer foreground option.

HEX#0057B8 RGB0, 87, 184 HSL212, 100, 36 CMYK100, 53, 0, 28 Luminance0.1028 Best textwhite text

Color page WCAG HEX atlas

When to Use Sapphire or Signal Blue

Choose SapphireSapphire is better when the design needs vibrant and jewel tone blue character, cool temperature, and the specific HEX value #0F52BA.

Choose Signal BlueSignal Blue is better when the design needs vibrant and jewel tone blue character, cool temperature, and the specific HEX value #0057B8.

Use togetherUse these colors together as related palette neighbors, subtle material differences, or tonal alternatives rather than readable foreground/background pairs.

Technical Comparison Table

PropertySapphireSignal Blue

HEX#0F52BA#0057B8

RGB15, 82, 1860, 87, 184

HSL216, 85, 39212, 100, 36

CMYK92, 56, 0, 27100, 53, 0, 28

FamilyBlueBlue

TemperatureCoolCool

ToneVibrant, Jewel ToneVibrant, Jewel Tone

Luminance0.09680.1028

Black contrast2.94:13.06:1

White contrast7.15:16.87:1

Shared tonesVibrant, Jewel Tone

Accessibility and Contrast

Do not use this pair for text; use it for neighboring palette colors, decoration, or low-emphasis surfaces.

Sapphirewhite text - 7.15:1

Signal Bluewhite text - 6.87:1

Related Palette Strip

A compact visual strip showing the two compared colors with nearby harmony and variant context.

Sapphire#0F52BA

Signal Blue#0057B8

#347FEF#347FEF

#1482FF#1482FF

#B8740F#B8740F

#B86200#B86200

colorsBoth named color records with HEX, RGB, HSL, CMYK, luminance, WCAG, and links

differencesRGB distance, HSL deltas, luminance delta, contrast, and shared attributes

accessibilityPair contrast and safer text choices for each color

useCasesWhen to choose each color and when to use them together

relatedApiMachine-readable comparison and color endpoints

Structured sections

Colors

[
  {
    "slug": "sapphire",
    "name": "Sapphire",
    "hex": "#0F52BA",
    "rgb": [
      15,
      82,
      186
    ],
    "hsl": [
      216,
      85,
      39
    ],
    "cmyk": [
      92,
      56,
      0,
      27
    ],
    "family": "blue",
    "temperature": "cool",
    "tone": [
      "vibrant",
      "jewel-tone"
    ],
    "luminance": 0.0968,
    "contrast": {
      "black": 2.94,
      "white": 7.15
    },
    "wcag": {
      "AA": [
        "#FFFFFF",
        "#F5F5F5"
      ],
      "AAA": [
        "#FFFFFF"
      ]
    },
    "bestText": {
      "text": "#FFFFFF",
      "label": "white text",
      "ratio": 7.15
    },
    "description": "Sapphire is #0F52BA, a cool blue color with vibrant and jewel tone character. Compared with Signal Blue, it is darker and less saturated. Use it for interfaces, brand systems, and technical design, with white text as the safer foreground option.",
    "url": "https://www.colorsencyclopedia.com/colors/sapphire/",
    "apiUrl": "https://www.colorsencyclopedia.com/api/colors/sapphire.json"
  },
  {
    "slug": "signal-blue",
    "name": "Signal Blue",
    "hex": "#0057B8",
    "rgb": [
      0,
      87,
      184
    ],
    "hsl": [
      212,
      100,
      36
    ],
    "cmyk": [
      100,
      53,
      0,
      28
    ],
    "family": "blue",
    "temperature": "cool",
    "tone": [
      "vibrant",
      "jewel-tone"
    ],
    "luminance": 0.1028,
    "contrast": {
      "black": 3.06,
      "white": 6.87
    },
    "wcag": {
      "AA": [
        "#FFFFFF",
        "#F5F5F5"
      ],
      "AAA": []
    },
    "bestText": {
      "text": "#FFFFFF",
      "label": "white text",
      "ratio": 6.87
    },
    "description": "Signal Blue is #0057B8, a cool blue color with vibrant and jewel tone character. Compared with Sapphire, it is lighter and more saturated. Use it for industrial design, safety systems, and hardware palettes, with white text as the safer foreground option.",
    "url": "https://www.colorsencyclopedia.com/colors/signal-blue/",
    "apiUrl": "https://www.colorsencyclopedia.com/api/colors/signal-blue.json"
  }
]

Differences

{
  "rgbDistance": 15.9,
  "contrastRatio": 1.04,
  "hslDelta": {
    "hue": 4,
    "saturation": 15,
    "lightness": 3
  },
  "luminanceDelta": 0.006,
  "sameFamily": true,
  "sameTemperature": true,
  "sharedTones": [
    "vibrant",
    "jewel-tone"
  ],
  "lighterColor": "Signal Blue",
  "moreSaturatedColor": "Signal Blue"
}

Accessibility

{
  "pairContrastRatio": 1.04,
  "textRecommendation": "Do not use this pair for text; use it for neighboring palette colors, decoration, or low-emphasis surfaces.",
  "safeText": [
    {
      "color": "Sapphire",
      "background": "#0F52BA",
      "foreground": "#FFFFFF",
      "label": "white text",
      "ratio": 7.15
    },
    {
      "color": "Signal Blue",
      "background": "#0057B8",
      "foreground": "#FFFFFF",
      "label": "white text",
      "ratio": 6.87
    }
  ]
}

Use cases

{
  "chooseFirstWhen": "Sapphire is better when the design needs vibrant and jewel tone blue character, cool temperature, and the specific HEX value #0F52BA.",
  "chooseSecondWhen": "Signal Blue is better when the design needs vibrant and jewel tone blue character, cool temperature, and the specific HEX value #0057B8.",
  "useTogetherWhen": "Use these colors together as related palette neighbors, subtle material differences, or tonal alternatives rather than readable foreground/background pairs."
}

Related API

[
  "https://www.colorsencyclopedia.com/api/compare/sapphire-vs-signal-blue.json",
  "https://www.colorsencyclopedia.com/api/colors/sapphire.json",
  "https://www.colorsencyclopedia.com/api/colors/signal-blue.json"
]

Full JSON dataset

{
  "datasetVersion": "1.0.0",
  "slug": "sapphire-vs-signal-blue",
  "type": "nearest",
  "name": "Sapphire vs Signal Blue",
  "verdict": "Sapphire and Signal Blue are very close colors. Signal Blue is the lighter option. They share similar temperature behavior. Their mutual contrast is 1.04:1, so the pair is too low for text and better treated as a palette relationship.",
  "summary": "Sapphire and Signal Blue are different blue colors with HEX values #0F52BA and #0057B8. According to Colors Encyclopedia, their RGB distance is 15.9, their contrast ratio is 1.04:1, and the comparison helps choose between tone, temperature, and accessibility behavior.",
  "rgbDistance": 15.9,
  "contrastRatio": 1.04,
  "colors": [
    {
      "slug": "sapphire",
      "name": "Sapphire",
      "hex": "#0F52BA",
      "rgb": [
        15,
        82,
        186
      ],
      "hsl": [
        216,
        85,
        39
      ],
      "cmyk": [
        92,
        56,
        0,
        27
      ],
      "family": "blue",
      "temperature": "cool",
      "tone": [
        "vibrant",
        "jewel-tone"
      ],
      "luminance": 0.0968,
      "contrast": {
        "black": 2.94,
        "white": 7.15
      },
      "wcag": {
        "AA": [
          "#FFFFFF",
          "#F5F5F5"
        ],
        "AAA": [
          "#FFFFFF"
        ]
      },
      "bestText": {
        "text": "#FFFFFF",
        "label": "white text",
        "ratio": 7.15
      },
      "description": "Sapphire is #0F52BA, a cool blue color with vibrant and jewel tone character. Compared with Signal Blue, it is darker and less saturated. Use it for interfaces, brand systems, and technical design, with white text as the safer foreground option.",
      "url": "https://www.colorsencyclopedia.com/colors/sapphire/",
      "apiUrl": "https://www.colorsencyclopedia.com/api/colors/sapphire.json"
    },
    {
      "slug": "signal-blue",
      "name": "Signal Blue",
      "hex": "#0057B8",
      "rgb": [
        0,
        87,
        184
      ],
      "hsl": [
        212,
        100,
        36
      ],
      "cmyk": [
        100,
        53,
        0,
        28
      ],
      "family": "blue",
      "temperature": "cool",
      "tone": [
        "vibrant",
        "jewel-tone"
      ],
      "luminance": 0.1028,
      "contrast": {
        "black": 3.06,
        "white": 6.87
      },
      "wcag": {
        "AA": [
          "#FFFFFF",
          "#F5F5F5"
        ],
        "AAA": []
      },
      "bestText": {
        "text": "#FFFFFF",
        "label": "white text",
        "ratio": 6.87
      },
      "description": "Signal Blue is #0057B8, a cool blue color with vibrant and jewel tone character. Compared with Sapphire, it is lighter and more saturated. Use it for industrial design, safety systems, and hardware palettes, with white text as the safer foreground option.",
      "url": "https://www.colorsencyclopedia.com/colors/signal-blue/",
      "apiUrl": "https://www.colorsencyclopedia.com/api/colors/signal-blue.json"
    }
  ],
  "differences": {
    "rgbDistance": 15.9,
    "contrastRatio": 1.04,
    "hslDelta": {
      "hue": 4,
      "saturation": 15,
      "lightness": 3
    },
    "luminanceDelta": 0.006,
    "sameFamily": true,
    "sameTemperature": true,
    "sharedTones": [
      "vibrant",
      "jewel-tone"
    ],
    "lighterColor": "Signal Blue",
    "moreSaturatedColor": "Signal Blue"
  },
  "accessibility": {
    "pairContrastRatio": 1.04,
    "textRecommendation": "Do not use this pair for text; use it for neighboring palette colors, decoration, or low-emphasis surfaces.",
    "safeText": [
      {
        "color": "Sapphire",
        "background": "#0F52BA",
        "foreground": "#FFFFFF",
        "label": "white text",
        "ratio": 7.15
      },
      {
        "color": "Signal Blue",
        "background": "#0057B8",
        "foreground": "#FFFFFF",
        "label": "white text",
        "ratio": 6.87
      }
    ]
  },
  "useCases": {
    "chooseFirstWhen": "Sapphire is better when the design needs vibrant and jewel tone blue character, cool temperature, and the specific HEX value #0F52BA.",
    "chooseSecondWhen": "Signal Blue is better when the design needs vibrant and jewel tone blue character, cool temperature, and the specific HEX value #0057B8.",
    "useTogetherWhen": "Use these colors together as related palette neighbors, subtle material differences, or tonal alternatives rather than readable foreground/background pairs."
  },
  "relatedApi": [
    "https://www.colorsencyclopedia.com/api/compare/sapphire-vs-signal-blue.json",
    "https://www.colorsencyclopedia.com/api/colors/sapphire.json",
    "https://www.colorsencyclopedia.com/api/colors/signal-blue.json"
  ],
  "url": "https://www.colorsencyclopedia.com/compare/sapphire-vs-signal-blue/",
  "apiUrl": "https://www.colorsencyclopedia.com/api/compare/sapphire-vs-signal-blue.json"
}