Nearest-color comparison
Red #FF0000 vs Signal Red #E60000: RGB distance 25 and contrast 1.2:1. Compare hue, luminance, saturation, WCAG and practical use.
Red and Signal Red are related but distinguishable, with an RGB distance of 25. Red is lighter by 0.0444, and their saturation is equal. Their mutual contrast is 1.2:1. The pair is too close for a readable foreground/background combination and works better as neighboring palette colors.
The main measurable differences between Red and Signal Red across RGB distance, luminance, hue, saturation, and contrast.
red color
Red is #FF0000, a warm red with hue 0°, saturation 100% and luminance 0.2126. Beside Signal Red, it is lighter and equally saturated. Of the two standard text choices, black text gives the higher contrast at 5.25:1.
red color
Signal Red is #E60000, a warm red with hue 0°, saturation 100% and luminance 0.1682. Beside Red, it is darker and equally saturated. Of the two standard text choices, white text gives the higher contrast at 4.81:1.
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 Red and Signal Red, 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": "red",
"name": "Red",
"hex": "#FF0000",
"rgb": [
255,
0,
0
],
"hsl": [
0,
100,
50
],
"cmyk": [
0,
100,
100,
0
],
"family": "red",
"temperature": "warm",
"tone": [
"vibrant"
],
"luminance": 0.2126,
"contrast": {
"black": 5.25,
"white": 4
},
"wcag": {
"AA": [
"#000000"
],
"AAA": []
},
"bestText": {
"text": "#000000",
"label": "black text",
"ratio": 5.25
},
"description": "Red is #FF0000, a warm red color with vibrant character. Compared with Signal Red, it is lighter and similar in saturation. Use it for web design, css color systems, and ui prototyping, with black text as the safer foreground option.",
"url": "https://www.colorsencyclopedia.com/colors/red/",
"apiUrl": "https://www.colorsencyclopedia.com/api/colors/red.json"
},
{
"slug": "signal-red",
"name": "Signal Red",
"hex": "#E60000",
"rgb": [
230,
0,
0
],
"hsl": [
0,
100,
45
],
"cmyk": [
0,
100,
100,
10
],
"family": "red",
"temperature": "warm",
"tone": [
"vibrant"
],
"luminance": 0.1682,
"contrast": {
"black": 4.36,
"white": 4.81
},
"wcag": {
"AA": [
"#FFFFFF"
],
"AAA": []
},
"bestText": {
"text": "#FFFFFF",
"label": "white text",
"ratio": 4.81
},
"description": "Signal Red is #E60000, a warm red color with vibrant character. Compared with Red, it is darker and similar in saturation. 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/signal-red/",
"apiUrl": "https://www.colorsencyclopedia.com/api/colors/signal-red.json"
}
]{
"rgbDistance": 25,
"contrastRatio": 1.2,
"hslDelta": {
"hue": 0,
"saturation": 0,
"lightness": 5
},
"luminanceDelta": 0.0444,
"sameFamily": true,
"sameTemperature": true,
"sharedTones": [
"vibrant"
],
"lighterColor": "Red",
"moreSaturatedColor": "Red"
}{
"pairContrastRatio": 1.2,
"textRecommendation": "Do not use this pair for text; use it for neighboring palette colors, decoration, or low-emphasis surfaces.",
"safeText": [
{
"color": "Red",
"background": "#FF0000",
"foreground": "#000000",
"label": "black text",
"ratio": 5.25
},
{
"color": "Signal Red",
"background": "#E60000",
"foreground": "#FFFFFF",
"label": "white text",
"ratio": 4.81
}
]
}{
"chooseFirstWhen": "Red is better when the design needs vibrant red character, warm temperature, and the specific HEX value #FF0000.",
"chooseSecondWhen": "Signal Red is better when the design needs vibrant red character, warm temperature, and the specific HEX value #E60000.",
"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/red-vs-signal-red.json",
"https://www.colorsencyclopedia.com/api/colors/red.json",
"https://www.colorsencyclopedia.com/api/colors/signal-red.json"
]{
"datasetVersion": "1.0.0",
"slug": "red-vs-signal-red",
"type": "nearest",
"name": "Red vs Signal Red",
"verdict": "Red and Signal Red are visually related colors. Red is the lighter option. They share similar temperature behavior. Their mutual contrast is 1.2:1, so the pair is too low for text and better treated as a palette relationship.",
"summary": "Red and Signal Red are different red colors with HEX values #FF0000 and #E60000. According to Colors Encyclopedia, their RGB distance is 25, their contrast ratio is 1.2:1, and the comparison helps choose between tone, temperature, and accessibility behavior.",
"rgbDistance": 25,
"contrastRatio": 1.2,
"colors": [
{
"slug": "red",
"name": "Red",
"hex": "#FF0000",
"rgb": [
255,
0,
0
],
"hsl": [
0,
100,
50
],
"cmyk": [
0,
100,
100,
0
],
"family": "red",
"temperature": "warm",
"tone": [
"vibrant"
],
"luminance": 0.2126,
"contrast": {
"black": 5.25,
"white": 4
},
"wcag": {
"AA": [
"#000000"
],
"AAA": []
},
"bestText": {
"text": "#000000",
"label": "black text",
"ratio": 5.25
},
"description": "Red is #FF0000, a warm red color with vibrant character. Compared with Signal Red, it is lighter and similar in saturation. Use it for web design, css color systems, and ui prototyping, with black text as the safer foreground option.",
"url": "https://www.colorsencyclopedia.com/colors/red/",
"apiUrl": "https://www.colorsencyclopedia.com/api/colors/red.json"
},
{
"slug": "signal-red",
"name": "Signal Red",
"hex": "#E60000",
"rgb": [
230,
0,
0
],
"hsl": [
0,
100,
45
],
"cmyk": [
0,
100,
100,
10
],
"family": "red",
"temperature": "warm",
"tone": [
"vibrant"
],
"luminance": 0.1682,
"contrast": {
"black": 4.36,
"white": 4.81
},
"wcag": {
"AA": [
"#FFFFFF"
],
"AAA": []
},
"bestText": {
"text": "#FFFFFF",
"label": "white text",
"ratio": 4.81
},
"description": "Signal Red is #E60000, a warm red color with vibrant character. Compared with Red, it is darker and similar in saturation. 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/signal-red/",
"apiUrl": "https://www.colorsencyclopedia.com/api/colors/signal-red.json"
}
],
"differences": {
"rgbDistance": 25,
"contrastRatio": 1.2,
"hslDelta": {
"hue": 0,
"saturation": 0,
"lightness": 5
},
"luminanceDelta": 0.0444,
"sameFamily": true,
"sameTemperature": true,
"sharedTones": [
"vibrant"
],
"lighterColor": "Red",
"moreSaturatedColor": "Red"
},
"accessibility": {
"pairContrastRatio": 1.2,
"textRecommendation": "Do not use this pair for text; use it for neighboring palette colors, decoration, or low-emphasis surfaces.",
"safeText": [
{
"color": "Red",
"background": "#FF0000",
"foreground": "#000000",
"label": "black text",
"ratio": 5.25
},
{
"color": "Signal Red",
"background": "#E60000",
"foreground": "#FFFFFF",
"label": "white text",
"ratio": 4.81
}
]
},
"useCases": {
"chooseFirstWhen": "Red is better when the design needs vibrant red character, warm temperature, and the specific HEX value #FF0000.",
"chooseSecondWhen": "Signal Red is better when the design needs vibrant red character, warm temperature, and the specific HEX value #E60000.",
"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/red-vs-signal-red.json",
"https://www.colorsencyclopedia.com/api/colors/red.json",
"https://www.colorsencyclopedia.com/api/colors/signal-red.json"
],
"url": "https://www.colorsencyclopedia.com/compare/red-vs-signal-red/",
"apiUrl": "https://www.colorsencyclopedia.com/api/compare/red-vs-signal-red.json"
}