Nearest-color comparison

Cobalt Blue vs Sapphire

Cobalt Blue and Sapphire are different blue colors with HEX values #0047AB and #0F52BA. According to Colors Encyclopedia, their RGB distance is 23.9, their contrast ratio is 1.18:1, and the comparison helps choose between tone, temperature, and accessibility behavior.

Cobalt Blue and Sapphire are very close colors. Sapphire is the lighter option. They share similar temperature behavior. Their mutual contrast is 1.18:1, so the pair is too low for text and better treated as a palette relationship.

Differences Use cases Accessibility JSON

Cobalt Blue#0047AB

Sapphire#0F52BA

Quick Difference Summary

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

RGB distance23.9

Pair contrast1.18:1

Luminance delta0.0223

Hue delta1 deg

Lighter colorSapphire

More saturatedCobalt Blue

Side-by-Side Color Profiles

blue color

Cobalt Blue

Cobalt Blue is #0047AB, a cool blue color with jewel tone character. Compared with Sapphire, it is darker and more saturated. Use it for interfaces, brand systems, and technical design, with white text as the safer foreground option.

HEX#0047AB RGB0, 71, 171 HSL215, 100, 34 CMYK100, 58, 0, 33 Luminance0.0745 Best textwhite text

Color page WCAG HEX atlas

blue color

Sapphire

Sapphire is #0F52BA, a cool blue color with vibrant and jewel tone character. Compared with Cobalt Blue, it is lighter 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

When to Use Cobalt Blue or Sapphire

Choose Cobalt BlueCobalt Blue is better when the design needs jewel tone blue character, cool temperature, and the specific HEX value #0047AB.

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

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

Technical Comparison Table

PropertyCobalt BlueSapphire

HEX#0047AB#0F52BA

RGB0, 71, 17115, 82, 186

HSL215, 100, 34216, 85, 39

CMYK100, 58, 0, 3392, 56, 0, 27

FamilyBlueBlue

TemperatureCoolCool

ToneJewel ToneVibrant, Jewel Tone

Luminance0.07450.0968

Black contrast2.49:12.94:1

White contrast8.43:17.15:1

Shared tonesJewel Tone

Accessibility and Contrast

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

Cobalt Bluewhite text - 8.43:1

Sapphirewhite text - 7.15:1

Related Palette Strip

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

Cobalt Blue#0047AB

Sapphire#0F52BA

#0A70FF#0A70FF

#347FEF#347FEF

#AD6500#AD6500

#B8740F#B8740F

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": "cobalt-blue",
    "name": "Cobalt Blue",
    "hex": "#0047AB",
    "rgb": [
      0,
      71,
      171
    ],
    "hsl": [
      215,
      100,
      34
    ],
    "cmyk": [
      100,
      58,
      0,
      33
    ],
    "family": "blue",
    "temperature": "cool",
    "tone": [
      "jewel-tone"
    ],
    "luminance": 0.0745,
    "contrast": {
      "black": 2.49,
      "white": 8.43
    },
    "wcag": {
      "AA": [
        "#FFFFFF",
        "#F5F5F5"
      ],
      "AAA": [
        "#FFFFFF",
        "#F5F5F5"
      ]
    },
    "bestText": {
      "text": "#FFFFFF",
      "label": "white text",
      "ratio": 8.43
    },
    "description": "Cobalt Blue is #0047AB, a cool blue color with jewel tone character. Compared with Sapphire, it is darker and more saturated. Use it for interfaces, brand systems, and technical design, with white text as the safer foreground option.",
    "url": "https://www.colorsencyclopedia.com/colors/cobalt-blue/",
    "apiUrl": "https://www.colorsencyclopedia.com/api/colors/cobalt-blue.json"
  },
  {
    "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 Cobalt Blue, it is lighter 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"
  }
]

Differences

{
  "rgbDistance": 23.9,
  "contrastRatio": 1.18,
  "hslDelta": {
    "hue": 1,
    "saturation": 15,
    "lightness": 5
  },
  "luminanceDelta": 0.0223,
  "sameFamily": true,
  "sameTemperature": true,
  "sharedTones": [
    "jewel-tone"
  ],
  "lighterColor": "Sapphire",
  "moreSaturatedColor": "Cobalt Blue"
}

Accessibility

{
  "pairContrastRatio": 1.18,
  "textRecommendation": "Do not use this pair for text; use it for neighboring palette colors, decoration, or low-emphasis surfaces.",
  "safeText": [
    {
      "color": "Cobalt Blue",
      "background": "#0047AB",
      "foreground": "#FFFFFF",
      "label": "white text",
      "ratio": 8.43
    },
    {
      "color": "Sapphire",
      "background": "#0F52BA",
      "foreground": "#FFFFFF",
      "label": "white text",
      "ratio": 7.15
    }
  ]
}

Use cases

{
  "chooseFirstWhen": "Cobalt Blue is better when the design needs jewel tone blue character, cool temperature, and the specific HEX value #0047AB.",
  "chooseSecondWhen": "Sapphire is better when the design needs vibrant and jewel tone blue character, cool temperature, and the specific HEX value #0F52BA.",
  "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/cobalt-blue-vs-sapphire.json",
  "https://www.colorsencyclopedia.com/api/colors/cobalt-blue.json",
  "https://www.colorsencyclopedia.com/api/colors/sapphire.json"
]

Full JSON dataset

{
  "datasetVersion": "1.0.0",
  "slug": "cobalt-blue-vs-sapphire",
  "type": "nearest",
  "name": "Cobalt Blue vs Sapphire",
  "verdict": "Cobalt Blue and Sapphire are very close colors. Sapphire is the lighter option. They share similar temperature behavior. Their mutual contrast is 1.18:1, so the pair is too low for text and better treated as a palette relationship.",
  "summary": "Cobalt Blue and Sapphire are different blue colors with HEX values #0047AB and #0F52BA. According to Colors Encyclopedia, their RGB distance is 23.9, their contrast ratio is 1.18:1, and the comparison helps choose between tone, temperature, and accessibility behavior.",
  "rgbDistance": 23.9,
  "contrastRatio": 1.18,
  "colors": [
    {
      "slug": "cobalt-blue",
      "name": "Cobalt Blue",
      "hex": "#0047AB",
      "rgb": [
        0,
        71,
        171
      ],
      "hsl": [
        215,
        100,
        34
      ],
      "cmyk": [
        100,
        58,
        0,
        33
      ],
      "family": "blue",
      "temperature": "cool",
      "tone": [
        "jewel-tone"
      ],
      "luminance": 0.0745,
      "contrast": {
        "black": 2.49,
        "white": 8.43
      },
      "wcag": {
        "AA": [
          "#FFFFFF",
          "#F5F5F5"
        ],
        "AAA": [
          "#FFFFFF",
          "#F5F5F5"
        ]
      },
      "bestText": {
        "text": "#FFFFFF",
        "label": "white text",
        "ratio": 8.43
      },
      "description": "Cobalt Blue is #0047AB, a cool blue color with jewel tone character. Compared with Sapphire, it is darker and more saturated. Use it for interfaces, brand systems, and technical design, with white text as the safer foreground option.",
      "url": "https://www.colorsencyclopedia.com/colors/cobalt-blue/",
      "apiUrl": "https://www.colorsencyclopedia.com/api/colors/cobalt-blue.json"
    },
    {
      "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 Cobalt Blue, it is lighter 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"
    }
  ],
  "differences": {
    "rgbDistance": 23.9,
    "contrastRatio": 1.18,
    "hslDelta": {
      "hue": 1,
      "saturation": 15,
      "lightness": 5
    },
    "luminanceDelta": 0.0223,
    "sameFamily": true,
    "sameTemperature": true,
    "sharedTones": [
      "jewel-tone"
    ],
    "lighterColor": "Sapphire",
    "moreSaturatedColor": "Cobalt Blue"
  },
  "accessibility": {
    "pairContrastRatio": 1.18,
    "textRecommendation": "Do not use this pair for text; use it for neighboring palette colors, decoration, or low-emphasis surfaces.",
    "safeText": [
      {
        "color": "Cobalt Blue",
        "background": "#0047AB",
        "foreground": "#FFFFFF",
        "label": "white text",
        "ratio": 8.43
      },
      {
        "color": "Sapphire",
        "background": "#0F52BA",
        "foreground": "#FFFFFF",
        "label": "white text",
        "ratio": 7.15
      }
    ]
  },
  "useCases": {
    "chooseFirstWhen": "Cobalt Blue is better when the design needs jewel tone blue character, cool temperature, and the specific HEX value #0047AB.",
    "chooseSecondWhen": "Sapphire is better when the design needs vibrant and jewel tone blue character, cool temperature, and the specific HEX value #0F52BA.",
    "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/cobalt-blue-vs-sapphire.json",
    "https://www.colorsencyclopedia.com/api/colors/cobalt-blue.json",
    "https://www.colorsencyclopedia.com/api/colors/sapphire.json"
  ],
  "url": "https://www.colorsencyclopedia.com/compare/cobalt-blue-vs-sapphire/",
  "apiUrl": "https://www.colorsencyclopedia.com/api/compare/cobalt-blue-vs-sapphire.json"
}