Nearest-color comparison
Amethyst Deep #5D3A9B vs Rebecca Purple #663399: RGB distance 11.6 and contrast 1.02:1. Compare hue, luminance, saturation, WCAG and practical use.
Amethyst Deep and Rebecca Purple are very close, with an RGB distance of 11.6. Amethyst Deep is lighter by 0.0023, and Rebecca Purple is more saturated by 4 percentage points. Their mutual contrast is 1.02:1. The pair is too close for a readable foreground/background combination and works better as neighboring palette colors.
The main measurable differences between Amethyst Deep and Rebecca Purple across RGB distance, luminance, hue, saturation, and contrast.
purple color
Amethyst Deep is #5D3A9B, a cool purple with hue 262°, saturation 46% and luminance 0.0772. Beside Rebecca Purple, it is lighter and less saturated. Of the two standard text choices, white text gives the higher contrast at 8.25:1.
purple color
Rebecca Purple is #663399, a cool purple with hue 270°, saturation 50% and luminance 0.0749. Beside Amethyst Deep, it is darker and more saturated. Of the two standard text choices, white text gives the higher contrast at 8.41:1.
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 Amethyst Deep and Rebecca Purple, 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": "amethyst-deep",
"name": "Amethyst Deep",
"hex": "#5D3A9B",
"rgb": [
93,
58,
155
],
"hsl": [
262,
46,
42
],
"cmyk": [
40,
63,
0,
39
],
"family": "purple",
"temperature": "cool",
"tone": [
"jewel-tone"
],
"luminance": 0.0772,
"contrast": {
"black": 2.54,
"white": 8.25
},
"wcag": {
"AA": [
"#FFFFFF",
"#F5F5F5"
],
"AAA": [
"#FFFFFF",
"#F5F5F5"
]
},
"bestText": {
"text": "#FFFFFF",
"label": "white text",
"ratio": 8.25
},
"description": "Amethyst Deep is #5D3A9B, a cool purple color with jewel tone character. Compared with Rebecca Purple, it is lighter and less saturated. Use it for jewel-tone palettes, luxury branding, and premium interface accents, with white text as the safer foreground option.",
"url": "https://www.colorsencyclopedia.com/colors/amethyst-deep/",
"apiUrl": "https://www.colorsencyclopedia.com/api/colors/amethyst-deep.json"
},
{
"slug": "rebecca-purple",
"name": "Rebecca Purple",
"hex": "#663399",
"rgb": [
102,
51,
153
],
"hsl": [
270,
50,
40
],
"cmyk": [
33,
67,
0,
40
],
"family": "purple",
"temperature": "cool",
"tone": [
"jewel-tone"
],
"luminance": 0.0749,
"contrast": {
"black": 2.5,
"white": 8.41
},
"wcag": {
"AA": [
"#FFFFFF",
"#F5F5F5"
],
"AAA": [
"#FFFFFF",
"#F5F5F5"
]
},
"bestText": {
"text": "#FFFFFF",
"label": "white text",
"ratio": 8.41
},
"description": "Rebecca Purple is #663399, a cool purple color with jewel tone character. Compared with Amethyst Deep, it is darker 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/rebecca-purple/",
"apiUrl": "https://www.colorsencyclopedia.com/api/colors/rebecca-purple.json"
}
]{
"rgbDistance": 11.6,
"contrastRatio": 1.02,
"hslDelta": {
"hue": 8,
"saturation": 4,
"lightness": 2
},
"luminanceDelta": 0.0023,
"sameFamily": true,
"sameTemperature": true,
"sharedTones": [
"jewel-tone"
],
"lighterColor": "Amethyst Deep",
"moreSaturatedColor": "Rebecca Purple"
}{
"pairContrastRatio": 1.02,
"textRecommendation": "Do not use this pair for text; use it for neighboring palette colors, decoration, or low-emphasis surfaces.",
"safeText": [
{
"color": "Amethyst Deep",
"background": "#5D3A9B",
"foreground": "#FFFFFF",
"label": "white text",
"ratio": 8.25
},
{
"color": "Rebecca Purple",
"background": "#663399",
"foreground": "#FFFFFF",
"label": "white text",
"ratio": 8.41
}
]
}{
"chooseFirstWhen": "Amethyst Deep is better when the design needs jewel tone purple character, cool temperature, and the specific HEX value #5D3A9B.",
"chooseSecondWhen": "Rebecca Purple is better when the design needs jewel tone purple character, cool temperature, and the specific HEX value #663399.",
"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/amethyst-deep-vs-rebecca-purple.json",
"https://www.colorsencyclopedia.com/api/colors/amethyst-deep.json",
"https://www.colorsencyclopedia.com/api/colors/rebecca-purple.json"
]{
"datasetVersion": "1.0.0",
"slug": "amethyst-deep-vs-rebecca-purple",
"type": "nearest",
"name": "Amethyst Deep vs Rebecca Purple",
"verdict": "Amethyst Deep and Rebecca Purple are very close colors. Amethyst Deep is the lighter option. They share similar temperature behavior. Their mutual contrast is 1.02:1, so the pair is too low for text and better treated as a palette relationship.",
"summary": "Amethyst Deep and Rebecca Purple are different purple colors with HEX values #5D3A9B and #663399. According to Colors Encyclopedia, their RGB distance is 11.6, their contrast ratio is 1.02:1, and the comparison helps choose between tone, temperature, and accessibility behavior.",
"rgbDistance": 11.6,
"contrastRatio": 1.02,
"colors": [
{
"slug": "amethyst-deep",
"name": "Amethyst Deep",
"hex": "#5D3A9B",
"rgb": [
93,
58,
155
],
"hsl": [
262,
46,
42
],
"cmyk": [
40,
63,
0,
39
],
"family": "purple",
"temperature": "cool",
"tone": [
"jewel-tone"
],
"luminance": 0.0772,
"contrast": {
"black": 2.54,
"white": 8.25
},
"wcag": {
"AA": [
"#FFFFFF",
"#F5F5F5"
],
"AAA": [
"#FFFFFF",
"#F5F5F5"
]
},
"bestText": {
"text": "#FFFFFF",
"label": "white text",
"ratio": 8.25
},
"description": "Amethyst Deep is #5D3A9B, a cool purple color with jewel tone character. Compared with Rebecca Purple, it is lighter and less saturated. Use it for jewel-tone palettes, luxury branding, and premium interface accents, with white text as the safer foreground option.",
"url": "https://www.colorsencyclopedia.com/colors/amethyst-deep/",
"apiUrl": "https://www.colorsencyclopedia.com/api/colors/amethyst-deep.json"
},
{
"slug": "rebecca-purple",
"name": "Rebecca Purple",
"hex": "#663399",
"rgb": [
102,
51,
153
],
"hsl": [
270,
50,
40
],
"cmyk": [
33,
67,
0,
40
],
"family": "purple",
"temperature": "cool",
"tone": [
"jewel-tone"
],
"luminance": 0.0749,
"contrast": {
"black": 2.5,
"white": 8.41
},
"wcag": {
"AA": [
"#FFFFFF",
"#F5F5F5"
],
"AAA": [
"#FFFFFF",
"#F5F5F5"
]
},
"bestText": {
"text": "#FFFFFF",
"label": "white text",
"ratio": 8.41
},
"description": "Rebecca Purple is #663399, a cool purple color with jewel tone character. Compared with Amethyst Deep, it is darker 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/rebecca-purple/",
"apiUrl": "https://www.colorsencyclopedia.com/api/colors/rebecca-purple.json"
}
],
"differences": {
"rgbDistance": 11.6,
"contrastRatio": 1.02,
"hslDelta": {
"hue": 8,
"saturation": 4,
"lightness": 2
},
"luminanceDelta": 0.0023,
"sameFamily": true,
"sameTemperature": true,
"sharedTones": [
"jewel-tone"
],
"lighterColor": "Amethyst Deep",
"moreSaturatedColor": "Rebecca Purple"
},
"accessibility": {
"pairContrastRatio": 1.02,
"textRecommendation": "Do not use this pair for text; use it for neighboring palette colors, decoration, or low-emphasis surfaces.",
"safeText": [
{
"color": "Amethyst Deep",
"background": "#5D3A9B",
"foreground": "#FFFFFF",
"label": "white text",
"ratio": 8.25
},
{
"color": "Rebecca Purple",
"background": "#663399",
"foreground": "#FFFFFF",
"label": "white text",
"ratio": 8.41
}
]
},
"useCases": {
"chooseFirstWhen": "Amethyst Deep is better when the design needs jewel tone purple character, cool temperature, and the specific HEX value #5D3A9B.",
"chooseSecondWhen": "Rebecca Purple is better when the design needs jewel tone purple character, cool temperature, and the specific HEX value #663399.",
"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/amethyst-deep-vs-rebecca-purple.json",
"https://www.colorsencyclopedia.com/api/colors/amethyst-deep.json",
"https://www.colorsencyclopedia.com/api/colors/rebecca-purple.json"
],
"url": "https://www.colorsencyclopedia.com/compare/amethyst-deep-vs-rebecca-purple/",
"apiUrl": "https://www.colorsencyclopedia.com/api/compare/amethyst-deep-vs-rebecca-purple.json"
}