Nearest-color comparison
Primer Gray #8B8C89 vs River Stone #7E8A8A: RGB distance 13.2 and contrast 1.05:1. Compare hue, luminance, saturation, WCAG and practical use.
Primer Gray and River Stone are very close, with an RGB distance of 13.2. Primer Gray is lighter by 0.016, and River Stone is more saturated by 4 percentage points. Their mutual contrast is 1.05:1. The pair is too close for a readable foreground/background combination and works better as neighboring palette colors.
The main measurable differences between Primer Gray and River Stone across RGB distance, luminance, hue, saturation, and contrast.
gray color
Primer Gray is #8B8C89, a neutral gray with hue 80°, saturation 1% and luminance 0.2605. Beside River Stone, it is lighter and less saturated. Of the two standard text choices, black text gives the higher contrast at 6.21:1.
gray color
River Stone is #7E8A8A, a neutral gray with hue 180°, saturation 5% and luminance 0.2445. Beside Primer Gray, it is darker and more saturated. Of the two standard text choices, black text gives the higher contrast at 5.89:1.
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 Primer Gray and River Stone, 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": "primer-gray",
"name": "Primer Gray",
"hex": "#8B8C89",
"rgb": [
139,
140,
137
],
"hsl": [
80,
1,
54
],
"cmyk": [
1,
0,
2,
45
],
"family": "gray",
"temperature": "neutral",
"tone": [
"muted"
],
"luminance": 0.2605,
"contrast": {
"black": 6.21,
"white": 3.38
},
"wcag": {
"AA": [
"#000000",
"#1A1A1A"
],
"AAA": []
},
"bestText": {
"text": "#000000",
"label": "black text",
"ratio": 6.21
},
"description": "Primer Gray is #8B8C89, a neutral gray color with muted character. Compared with River Stone, it is lighter and less saturated. Use it for industrial design, safety systems, and hardware palettes, with black text as the safer foreground option.",
"url": "https://www.colorsencyclopedia.com/colors/primer-gray/",
"apiUrl": "https://www.colorsencyclopedia.com/api/colors/primer-gray.json"
},
{
"slug": "river-stone",
"name": "River Stone",
"hex": "#7E8A8A",
"rgb": [
126,
138,
138
],
"hsl": [
180,
5,
52
],
"cmyk": [
9,
0,
0,
46
],
"family": "gray",
"temperature": "neutral",
"tone": [
"muted"
],
"luminance": 0.2445,
"contrast": {
"black": 5.89,
"white": 3.57
},
"wcag": {
"AA": [
"#000000",
"#1A1A1A"
],
"AAA": []
},
"bestText": {
"text": "#000000",
"label": "black text",
"ratio": 5.89
},
"description": "River Stone is #7E8A8A, a neutral gray color with muted character. Compared with Primer Gray, it is darker and more saturated. Use it for earth-tone palettes, interior design, and material-inspired branding, with black text as the safer foreground option.",
"url": "https://www.colorsencyclopedia.com/colors/river-stone/",
"apiUrl": "https://www.colorsencyclopedia.com/api/colors/river-stone.json"
}
]{
"rgbDistance": 13.2,
"contrastRatio": 1.05,
"hslDelta": {
"hue": 100,
"saturation": 4,
"lightness": 2
},
"luminanceDelta": 0.016,
"sameFamily": true,
"sameTemperature": true,
"sharedTones": [
"muted"
],
"lighterColor": "Primer Gray",
"moreSaturatedColor": "River Stone"
}{
"pairContrastRatio": 1.05,
"textRecommendation": "Do not use this pair for text; use it for neighboring palette colors, decoration, or low-emphasis surfaces.",
"safeText": [
{
"color": "Primer Gray",
"background": "#8B8C89",
"foreground": "#000000",
"label": "black text",
"ratio": 6.21
},
{
"color": "River Stone",
"background": "#7E8A8A",
"foreground": "#000000",
"label": "black text",
"ratio": 5.89
}
]
}{
"chooseFirstWhen": "Primer Gray is better when the design needs muted gray character, neutral temperature, and the specific HEX value #8B8C89.",
"chooseSecondWhen": "River Stone is better when the design needs muted gray character, neutral temperature, and the specific HEX value #7E8A8A.",
"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/primer-gray-vs-river-stone.json",
"https://www.colorsencyclopedia.com/api/colors/primer-gray.json",
"https://www.colorsencyclopedia.com/api/colors/river-stone.json"
]{
"datasetVersion": "1.0.0",
"slug": "primer-gray-vs-river-stone",
"type": "nearest",
"name": "Primer Gray vs River Stone",
"verdict": "Primer Gray and River Stone are very close colors. Primer Gray is the lighter option. They share similar temperature behavior. Their mutual contrast is 1.05:1, so the pair is too low for text and better treated as a palette relationship.",
"summary": "Primer Gray and River Stone are different gray colors with HEX values #8B8C89 and #7E8A8A. According to Colors Encyclopedia, their RGB distance is 13.2, their contrast ratio is 1.05:1, and the comparison helps choose between tone, temperature, and accessibility behavior.",
"rgbDistance": 13.2,
"contrastRatio": 1.05,
"colors": [
{
"slug": "primer-gray",
"name": "Primer Gray",
"hex": "#8B8C89",
"rgb": [
139,
140,
137
],
"hsl": [
80,
1,
54
],
"cmyk": [
1,
0,
2,
45
],
"family": "gray",
"temperature": "neutral",
"tone": [
"muted"
],
"luminance": 0.2605,
"contrast": {
"black": 6.21,
"white": 3.38
},
"wcag": {
"AA": [
"#000000",
"#1A1A1A"
],
"AAA": []
},
"bestText": {
"text": "#000000",
"label": "black text",
"ratio": 6.21
},
"description": "Primer Gray is #8B8C89, a neutral gray color with muted character. Compared with River Stone, it is lighter and less saturated. Use it for industrial design, safety systems, and hardware palettes, with black text as the safer foreground option.",
"url": "https://www.colorsencyclopedia.com/colors/primer-gray/",
"apiUrl": "https://www.colorsencyclopedia.com/api/colors/primer-gray.json"
},
{
"slug": "river-stone",
"name": "River Stone",
"hex": "#7E8A8A",
"rgb": [
126,
138,
138
],
"hsl": [
180,
5,
52
],
"cmyk": [
9,
0,
0,
46
],
"family": "gray",
"temperature": "neutral",
"tone": [
"muted"
],
"luminance": 0.2445,
"contrast": {
"black": 5.89,
"white": 3.57
},
"wcag": {
"AA": [
"#000000",
"#1A1A1A"
],
"AAA": []
},
"bestText": {
"text": "#000000",
"label": "black text",
"ratio": 5.89
},
"description": "River Stone is #7E8A8A, a neutral gray color with muted character. Compared with Primer Gray, it is darker and more saturated. Use it for earth-tone palettes, interior design, and material-inspired branding, with black text as the safer foreground option.",
"url": "https://www.colorsencyclopedia.com/colors/river-stone/",
"apiUrl": "https://www.colorsencyclopedia.com/api/colors/river-stone.json"
}
],
"differences": {
"rgbDistance": 13.2,
"contrastRatio": 1.05,
"hslDelta": {
"hue": 100,
"saturation": 4,
"lightness": 2
},
"luminanceDelta": 0.016,
"sameFamily": true,
"sameTemperature": true,
"sharedTones": [
"muted"
],
"lighterColor": "Primer Gray",
"moreSaturatedColor": "River Stone"
},
"accessibility": {
"pairContrastRatio": 1.05,
"textRecommendation": "Do not use this pair for text; use it for neighboring palette colors, decoration, or low-emphasis surfaces.",
"safeText": [
{
"color": "Primer Gray",
"background": "#8B8C89",
"foreground": "#000000",
"label": "black text",
"ratio": 6.21
},
{
"color": "River Stone",
"background": "#7E8A8A",
"foreground": "#000000",
"label": "black text",
"ratio": 5.89
}
]
},
"useCases": {
"chooseFirstWhen": "Primer Gray is better when the design needs muted gray character, neutral temperature, and the specific HEX value #8B8C89.",
"chooseSecondWhen": "River Stone is better when the design needs muted gray character, neutral temperature, and the specific HEX value #7E8A8A.",
"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/primer-gray-vs-river-stone.json",
"https://www.colorsencyclopedia.com/api/colors/primer-gray.json",
"https://www.colorsencyclopedia.com/api/colors/river-stone.json"
],
"url": "https://www.colorsencyclopedia.com/compare/primer-gray-vs-river-stone/",
"apiUrl": "https://www.colorsencyclopedia.com/api/compare/primer-gray-vs-river-stone.json"
}