Nearest-color comparison

Neon Blue vs Royal Blue

Neon Blue and Royal Blue are different blue colors with HEX values #1F51FF and #4169E1. According to Colors Encyclopedia, their RGB distance is 51.3, their contrast ratio is 1.18:1, and the comparison helps choose between tone, temperature, and accessibility behavior.

Neon Blue and Royal Blue are visually related colors. Royal Blue 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

Neon Blue#1F51FF

Royal Blue#4169E1

Quick Difference Summary

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

RGB distance51.3

Pair contrast1.18:1

Luminance delta0.0326

Hue delta2 deg

Lighter colorRoyal Blue

More saturatedNeon Blue

Side-by-Side Color Profiles

blue color

Neon Blue

Neon Blue is #1F51FF, a cool blue color with vibrant character. Compared with Royal Blue, it is darker and more saturated. Use it for neon accents, event graphics, and high-energy digital design, with white text as the safer foreground option.

HEX#1F51FF RGB31, 81, 255 HSL227, 100, 56 CMYK88, 68, 0, 0 Luminance0.134 Best textwhite text

Color page WCAG HEX atlas

blue color

Royal Blue

Royal Blue is #4169E1, a cool blue color with vibrant character. Compared with Neon Blue, it is lighter and less saturated. Use it for web design, css color systems, and ui prototyping, with white text as the safer foreground option.

HEX#4169E1 RGB65, 105, 225 HSL225, 73, 57 CMYK71, 53, 0, 12 Luminance0.1666 Best textwhite text

Color page WCAG HEX atlas

When to Use Neon Blue or Royal Blue

Choose Neon BlueNeon Blue is better when the design needs vibrant blue character, cool temperature, and the specific HEX value #1F51FF.

Choose Royal BlueRoyal Blue is better when the design needs vibrant blue character, cool temperature, and the specific HEX value #4169E1.

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

Technical Comparison Table

PropertyNeon BlueRoyal Blue

HEX#1F51FF#4169E1

RGB31, 81, 25565, 105, 225

HSL227, 100, 56225, 73, 57

CMYK88, 68, 0, 071, 53, 0, 12

FamilyBlueBlue

TemperatureCoolCool

ToneVibrantVibrant

Luminance0.1340.1666

Black contrast3.68:14.33:1

White contrast5.71:14.85:1

Shared tonesVibrant

Accessibility and Contrast

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

Neon Bluewhite text - 5.71:1

Royal Bluewhite text - 4.85:1

Related Palette Strip

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

Neon Blue#1F51FF

Royal Blue#4169E1

#7A97FF#7A97FF

#91A8EE#91A8EE

#FFCE1F#FFCE1F

#E1B941#E1B941

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": "neon-blue",
    "name": "Neon Blue",
    "hex": "#1F51FF",
    "rgb": [
      31,
      81,
      255
    ],
    "hsl": [
      227,
      100,
      56
    ],
    "cmyk": [
      88,
      68,
      0,
      0
    ],
    "family": "blue",
    "temperature": "cool",
    "tone": [
      "vibrant"
    ],
    "luminance": 0.134,
    "contrast": {
      "black": 3.68,
      "white": 5.71
    },
    "wcag": {
      "AA": [
        "#FFFFFF",
        "#F5F5F5"
      ],
      "AAA": []
    },
    "bestText": {
      "text": "#FFFFFF",
      "label": "white text",
      "ratio": 5.71
    },
    "description": "Neon Blue is #1F51FF, a cool blue color with vibrant character. Compared with Royal Blue, it is darker and more saturated. Use it for neon accents, event graphics, and high-energy digital design, with white text as the safer foreground option.",
    "url": "https://www.colorsencyclopedia.com/colors/neon-blue/",
    "apiUrl": "https://www.colorsencyclopedia.com/api/colors/neon-blue.json"
  },
  {
    "slug": "royal-blue",
    "name": "Royal Blue",
    "hex": "#4169E1",
    "rgb": [
      65,
      105,
      225
    ],
    "hsl": [
      225,
      73,
      57
    ],
    "cmyk": [
      71,
      53,
      0,
      12
    ],
    "family": "blue",
    "temperature": "cool",
    "tone": [
      "vibrant"
    ],
    "luminance": 0.1666,
    "contrast": {
      "black": 4.33,
      "white": 4.85
    },
    "wcag": {
      "AA": [
        "#FFFFFF"
      ],
      "AAA": []
    },
    "bestText": {
      "text": "#FFFFFF",
      "label": "white text",
      "ratio": 4.85
    },
    "description": "Royal Blue is #4169E1, a cool blue color with vibrant character. Compared with Neon Blue, it is lighter and less 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/royal-blue/",
    "apiUrl": "https://www.colorsencyclopedia.com/api/colors/royal-blue.json"
  }
]

Differences

{
  "rgbDistance": 51.3,
  "contrastRatio": 1.18,
  "hslDelta": {
    "hue": 2,
    "saturation": 27,
    "lightness": 1
  },
  "luminanceDelta": 0.0326,
  "sameFamily": true,
  "sameTemperature": true,
  "sharedTones": [
    "vibrant"
  ],
  "lighterColor": "Royal Blue",
  "moreSaturatedColor": "Neon 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": "Neon Blue",
      "background": "#1F51FF",
      "foreground": "#FFFFFF",
      "label": "white text",
      "ratio": 5.71
    },
    {
      "color": "Royal Blue",
      "background": "#4169E1",
      "foreground": "#FFFFFF",
      "label": "white text",
      "ratio": 4.85
    }
  ]
}

Use cases

{
  "chooseFirstWhen": "Neon Blue is better when the design needs vibrant blue character, cool temperature, and the specific HEX value #1F51FF.",
  "chooseSecondWhen": "Royal Blue is better when the design needs vibrant blue character, cool temperature, and the specific HEX value #4169E1.",
  "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/neon-blue-vs-royal-blue.json",
  "https://www.colorsencyclopedia.com/api/colors/neon-blue.json",
  "https://www.colorsencyclopedia.com/api/colors/royal-blue.json"
]

Full JSON dataset

{
  "datasetVersion": "1.0.0",
  "slug": "neon-blue-vs-royal-blue",
  "type": "nearest",
  "name": "Neon Blue vs Royal Blue",
  "verdict": "Neon Blue and Royal Blue are visually related colors. Royal Blue 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": "Neon Blue and Royal Blue are different blue colors with HEX values #1F51FF and #4169E1. According to Colors Encyclopedia, their RGB distance is 51.3, their contrast ratio is 1.18:1, and the comparison helps choose between tone, temperature, and accessibility behavior.",
  "rgbDistance": 51.3,
  "contrastRatio": 1.18,
  "colors": [
    {
      "slug": "neon-blue",
      "name": "Neon Blue",
      "hex": "#1F51FF",
      "rgb": [
        31,
        81,
        255
      ],
      "hsl": [
        227,
        100,
        56
      ],
      "cmyk": [
        88,
        68,
        0,
        0
      ],
      "family": "blue",
      "temperature": "cool",
      "tone": [
        "vibrant"
      ],
      "luminance": 0.134,
      "contrast": {
        "black": 3.68,
        "white": 5.71
      },
      "wcag": {
        "AA": [
          "#FFFFFF",
          "#F5F5F5"
        ],
        "AAA": []
      },
      "bestText": {
        "text": "#FFFFFF",
        "label": "white text",
        "ratio": 5.71
      },
      "description": "Neon Blue is #1F51FF, a cool blue color with vibrant character. Compared with Royal Blue, it is darker and more saturated. Use it for neon accents, event graphics, and high-energy digital design, with white text as the safer foreground option.",
      "url": "https://www.colorsencyclopedia.com/colors/neon-blue/",
      "apiUrl": "https://www.colorsencyclopedia.com/api/colors/neon-blue.json"
    },
    {
      "slug": "royal-blue",
      "name": "Royal Blue",
      "hex": "#4169E1",
      "rgb": [
        65,
        105,
        225
      ],
      "hsl": [
        225,
        73,
        57
      ],
      "cmyk": [
        71,
        53,
        0,
        12
      ],
      "family": "blue",
      "temperature": "cool",
      "tone": [
        "vibrant"
      ],
      "luminance": 0.1666,
      "contrast": {
        "black": 4.33,
        "white": 4.85
      },
      "wcag": {
        "AA": [
          "#FFFFFF"
        ],
        "AAA": []
      },
      "bestText": {
        "text": "#FFFFFF",
        "label": "white text",
        "ratio": 4.85
      },
      "description": "Royal Blue is #4169E1, a cool blue color with vibrant character. Compared with Neon Blue, it is lighter and less 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/royal-blue/",
      "apiUrl": "https://www.colorsencyclopedia.com/api/colors/royal-blue.json"
    }
  ],
  "differences": {
    "rgbDistance": 51.3,
    "contrastRatio": 1.18,
    "hslDelta": {
      "hue": 2,
      "saturation": 27,
      "lightness": 1
    },
    "luminanceDelta": 0.0326,
    "sameFamily": true,
    "sameTemperature": true,
    "sharedTones": [
      "vibrant"
    ],
    "lighterColor": "Royal Blue",
    "moreSaturatedColor": "Neon 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": "Neon Blue",
        "background": "#1F51FF",
        "foreground": "#FFFFFF",
        "label": "white text",
        "ratio": 5.71
      },
      {
        "color": "Royal Blue",
        "background": "#4169E1",
        "foreground": "#FFFFFF",
        "label": "white text",
        "ratio": 4.85
      }
    ]
  },
  "useCases": {
    "chooseFirstWhen": "Neon Blue is better when the design needs vibrant blue character, cool temperature, and the specific HEX value #1F51FF.",
    "chooseSecondWhen": "Royal Blue is better when the design needs vibrant blue character, cool temperature, and the specific HEX value #4169E1.",
    "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/neon-blue-vs-royal-blue.json",
    "https://www.colorsencyclopedia.com/api/colors/neon-blue.json",
    "https://www.colorsencyclopedia.com/api/colors/royal-blue.json"
  ],
  "url": "https://www.colorsencyclopedia.com/compare/neon-blue-vs-royal-blue/",
  "apiUrl": "https://www.colorsencyclopedia.com/api/compare/neon-blue-vs-royal-blue.json"
}