Nearest-color comparison

Slate Blue vs Royal Purple

Slate Blue and Royal Purple are different blue and purple colors with HEX values #6A5ACD and #7851A9. According to Colors Encyclopedia, their RGB distance is 39.7, their contrast ratio is 1.11:1, and the comparison helps choose between tone, temperature, and accessibility behavior.

Slate Blue and Royal Purple are visually related colors. Slate Blue is the lighter option. They share similar temperature behavior. Their mutual contrast is 1.11:1, so the pair is too low for text and better treated as a palette relationship.

Differences Use cases Accessibility JSON

Slate Blue#6A5ACD

Royal Purple#7851A9

Quick Difference Summary

The main measurable differences between Slate Blue and Royal Purple across RGB distance, luminance, hue, saturation, and contrast.

RGB distance39.7

Pair contrast1.11:1

Luminance delta0.0204

Hue delta19 deg

Lighter colorSlate Blue

More saturatedSlate Blue

Side-by-Side Color Profiles

blue color

Slate Blue

Slate Blue is #6A5ACD, a cool blue color with balanced character. Compared with Royal Purple, it is lighter and more saturated. Use it for web design, css color systems, and ui prototyping, with white text as the safer foreground option.

HEX#6A5ACD RGB106, 90, 205 HSL248, 53, 58 CMYK48, 56, 0, 20 Luminance0.1478 Best textwhite text

Color page WCAG HEX atlas

purple color

Royal Purple

Royal Purple is #7851A9, a cool purple color with balanced character. Compared with Slate Blue, it is darker and less saturated. Use it for beauty branding, creative systems, and premium accents, with white text as the safer foreground option.

HEX#7851A9 RGB120, 81, 169 HSL267, 35, 49 CMYK29, 52, 0, 34 Luminance0.1274 Best textwhite text

Color page WCAG HEX atlas

When to Use Slate Blue or Royal Purple

Choose Slate BlueSlate Blue is better when the design needs balanced blue character, cool temperature, and the specific HEX value #6A5ACD.

Choose Royal PurpleRoyal Purple is better when the design needs balanced purple character, cool temperature, and the specific HEX value #7851A9.

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

Technical Comparison Table

PropertySlate BlueRoyal Purple

HEX#6A5ACD#7851A9

RGB106, 90, 205120, 81, 169

HSL248, 53, 58267, 35, 49

CMYK48, 56, 0, 2029, 52, 0, 34

FamilyBluePurple

TemperatureCoolCool

ToneBalancedBalanced

Luminance0.14780.1274

Black contrast3.96:13.55:1

White contrast5.31:15.92:1

Shared tonesBalanced

Accessibility and Contrast

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

Slate Bluewhite text - 5.31:1

Royal Purplewhite text - 5.92:1

Related Palette Strip

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

Slate Blue#6A5ACD

Royal Purple#7851A9

#AAA1E2#AAA1E2

#A88DC8#A88DC8

#BECD5B#BECD5B

#81A951#81A951

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": "slate-blue",
    "name": "Slate Blue",
    "hex": "#6A5ACD",
    "rgb": [
      106,
      90,
      205
    ],
    "hsl": [
      248,
      53,
      58
    ],
    "cmyk": [
      48,
      56,
      0,
      20
    ],
    "family": "blue",
    "temperature": "cool",
    "tone": [
      "balanced"
    ],
    "luminance": 0.1478,
    "contrast": {
      "black": 3.96,
      "white": 5.31
    },
    "wcag": {
      "AA": [
        "#FFFFFF",
        "#F5F5F5"
      ],
      "AAA": []
    },
    "bestText": {
      "text": "#FFFFFF",
      "label": "white text",
      "ratio": 5.31
    },
    "description": "Slate Blue is #6A5ACD, a cool blue color with balanced character. Compared with Royal Purple, it is lighter and more saturated. Use it for web design, css color systems, and ui prototyping, with white text as the safer foreground option.",
    "url": "https://www.colorsencyclopedia.com/colors/slate-blue/",
    "apiUrl": "https://www.colorsencyclopedia.com/api/colors/slate-blue.json"
  },
  {
    "slug": "royal-purple",
    "name": "Royal Purple",
    "hex": "#7851A9",
    "rgb": [
      120,
      81,
      169
    ],
    "hsl": [
      267,
      35,
      49
    ],
    "cmyk": [
      29,
      52,
      0,
      34
    ],
    "family": "purple",
    "temperature": "cool",
    "tone": [
      "balanced"
    ],
    "luminance": 0.1274,
    "contrast": {
      "black": 3.55,
      "white": 5.92
    },
    "wcag": {
      "AA": [
        "#FFFFFF",
        "#F5F5F5"
      ],
      "AAA": []
    },
    "bestText": {
      "text": "#FFFFFF",
      "label": "white text",
      "ratio": 5.92
    },
    "description": "Royal Purple is #7851A9, a cool purple color with balanced character. Compared with Slate Blue, it is darker and less saturated. Use it for beauty branding, creative systems, and premium accents, with white text as the safer foreground option.",
    "url": "https://www.colorsencyclopedia.com/colors/royal-purple/",
    "apiUrl": "https://www.colorsencyclopedia.com/api/colors/royal-purple.json"
  }
]

Differences

{
  "rgbDistance": 39.7,
  "contrastRatio": 1.11,
  "hslDelta": {
    "hue": 19,
    "saturation": 18,
    "lightness": 9
  },
  "luminanceDelta": 0.0204,
  "sameFamily": false,
  "sameTemperature": true,
  "sharedTones": [
    "balanced"
  ],
  "lighterColor": "Slate Blue",
  "moreSaturatedColor": "Slate Blue"
}

Accessibility

{
  "pairContrastRatio": 1.11,
  "textRecommendation": "Do not use this pair for text; use it for neighboring palette colors, decoration, or low-emphasis surfaces.",
  "safeText": [
    {
      "color": "Slate Blue",
      "background": "#6A5ACD",
      "foreground": "#FFFFFF",
      "label": "white text",
      "ratio": 5.31
    },
    {
      "color": "Royal Purple",
      "background": "#7851A9",
      "foreground": "#FFFFFF",
      "label": "white text",
      "ratio": 5.92
    }
  ]
}

Use cases

{
  "chooseFirstWhen": "Slate Blue is better when the design needs balanced blue character, cool temperature, and the specific HEX value #6A5ACD.",
  "chooseSecondWhen": "Royal Purple is better when the design needs balanced purple character, cool temperature, and the specific HEX value #7851A9.",
  "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/slate-blue-vs-royal-purple.json",
  "https://www.colorsencyclopedia.com/api/colors/slate-blue.json",
  "https://www.colorsencyclopedia.com/api/colors/royal-purple.json"
]

Full JSON dataset

{
  "datasetVersion": "1.0.0",
  "slug": "slate-blue-vs-royal-purple",
  "type": "nearest",
  "name": "Slate Blue vs Royal Purple",
  "verdict": "Slate Blue and Royal Purple are visually related colors. Slate Blue is the lighter option. They share similar temperature behavior. Their mutual contrast is 1.11:1, so the pair is too low for text and better treated as a palette relationship.",
  "summary": "Slate Blue and Royal Purple are different blue and purple colors with HEX values #6A5ACD and #7851A9. According to Colors Encyclopedia, their RGB distance is 39.7, their contrast ratio is 1.11:1, and the comparison helps choose between tone, temperature, and accessibility behavior.",
  "rgbDistance": 39.7,
  "contrastRatio": 1.11,
  "colors": [
    {
      "slug": "slate-blue",
      "name": "Slate Blue",
      "hex": "#6A5ACD",
      "rgb": [
        106,
        90,
        205
      ],
      "hsl": [
        248,
        53,
        58
      ],
      "cmyk": [
        48,
        56,
        0,
        20
      ],
      "family": "blue",
      "temperature": "cool",
      "tone": [
        "balanced"
      ],
      "luminance": 0.1478,
      "contrast": {
        "black": 3.96,
        "white": 5.31
      },
      "wcag": {
        "AA": [
          "#FFFFFF",
          "#F5F5F5"
        ],
        "AAA": []
      },
      "bestText": {
        "text": "#FFFFFF",
        "label": "white text",
        "ratio": 5.31
      },
      "description": "Slate Blue is #6A5ACD, a cool blue color with balanced character. Compared with Royal Purple, it is lighter and more saturated. Use it for web design, css color systems, and ui prototyping, with white text as the safer foreground option.",
      "url": "https://www.colorsencyclopedia.com/colors/slate-blue/",
      "apiUrl": "https://www.colorsencyclopedia.com/api/colors/slate-blue.json"
    },
    {
      "slug": "royal-purple",
      "name": "Royal Purple",
      "hex": "#7851A9",
      "rgb": [
        120,
        81,
        169
      ],
      "hsl": [
        267,
        35,
        49
      ],
      "cmyk": [
        29,
        52,
        0,
        34
      ],
      "family": "purple",
      "temperature": "cool",
      "tone": [
        "balanced"
      ],
      "luminance": 0.1274,
      "contrast": {
        "black": 3.55,
        "white": 5.92
      },
      "wcag": {
        "AA": [
          "#FFFFFF",
          "#F5F5F5"
        ],
        "AAA": []
      },
      "bestText": {
        "text": "#FFFFFF",
        "label": "white text",
        "ratio": 5.92
      },
      "description": "Royal Purple is #7851A9, a cool purple color with balanced character. Compared with Slate Blue, it is darker and less saturated. Use it for beauty branding, creative systems, and premium accents, with white text as the safer foreground option.",
      "url": "https://www.colorsencyclopedia.com/colors/royal-purple/",
      "apiUrl": "https://www.colorsencyclopedia.com/api/colors/royal-purple.json"
    }
  ],
  "differences": {
    "rgbDistance": 39.7,
    "contrastRatio": 1.11,
    "hslDelta": {
      "hue": 19,
      "saturation": 18,
      "lightness": 9
    },
    "luminanceDelta": 0.0204,
    "sameFamily": false,
    "sameTemperature": true,
    "sharedTones": [
      "balanced"
    ],
    "lighterColor": "Slate Blue",
    "moreSaturatedColor": "Slate Blue"
  },
  "accessibility": {
    "pairContrastRatio": 1.11,
    "textRecommendation": "Do not use this pair for text; use it for neighboring palette colors, decoration, or low-emphasis surfaces.",
    "safeText": [
      {
        "color": "Slate Blue",
        "background": "#6A5ACD",
        "foreground": "#FFFFFF",
        "label": "white text",
        "ratio": 5.31
      },
      {
        "color": "Royal Purple",
        "background": "#7851A9",
        "foreground": "#FFFFFF",
        "label": "white text",
        "ratio": 5.92
      }
    ]
  },
  "useCases": {
    "chooseFirstWhen": "Slate Blue is better when the design needs balanced blue character, cool temperature, and the specific HEX value #6A5ACD.",
    "chooseSecondWhen": "Royal Purple is better when the design needs balanced purple character, cool temperature, and the specific HEX value #7851A9.",
    "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/slate-blue-vs-royal-purple.json",
    "https://www.colorsencyclopedia.com/api/colors/slate-blue.json",
    "https://www.colorsencyclopedia.com/api/colors/royal-purple.json"
  ],
  "url": "https://www.colorsencyclopedia.com/compare/slate-blue-vs-royal-purple/",
  "apiUrl": "https://www.colorsencyclopedia.com/api/compare/slate-blue-vs-royal-purple.json"
}