Nearest-color comparison
Neon Blue #1F51FF vs Royal Blue #4169E1: RGB distance 51.3 and contrast 1.18:1. Compare hue, luminance, saturation, WCAG and practical use.
Neon Blue and Royal Blue are related but distinguishable, with an RGB distance of 51.3. Royal Blue is lighter by 0.0326, and Neon Blue is more saturated by 27 percentage points. Their mutual contrast is 1.18:1. The pair is too close for a readable foreground/background combination and works better as neighboring palette colors.
The main measurable differences between Neon Blue and Royal Blue across RGB distance, luminance, hue, saturation, and contrast.
blue color
Neon Blue is #1F51FF, a cool blue with hue 227°, saturation 100% and luminance 0.134. Beside Royal Blue, it is darker and more saturated. Of the two standard text choices, white text gives the higher contrast at 5.71:1.
blue color
Royal Blue is #4169E1, a cool blue with hue 225°, saturation 73% and luminance 0.1666. Beside Neon Blue, it is lighter and less saturated. Of the two standard text choices, white text gives the higher contrast at 4.85:1.
Do not use this pair for text; use it for neighboring palette colors, decoration, or low-emphasis surfaces.
Downloadable color comparison infographic
Save a high-resolution comparison infographic with both HEX colors, visual distance, mutual contrast, and accessibility guidance.
A compact visual strip showing the two compared colors with nearby harmony and variant context.
Machine-readable data
Structured comparison data for Neon Blue and Royal Blue, including color systems, RGB distance, HSL deltas, contrast, accessibility guidance, use cases, and API links.
Colors Encyclopedia
colorsBoth named color records with HEX, RGB, HSL, CMYK, luminance, WCAG, and linksdifferencesRGB distance, HSL deltas, luminance delta, contrast, and shared attributesaccessibilityPair contrast and safer text choices for each coloruseCasesWhen to choose each color and when to use them togetherrelatedApiMachine-readable comparison and color endpoints[
{
"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"
}
]{
"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"
}{
"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
}
]
}{
"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."
}[
"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"
]{
"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"
}