Nearest-color comparison

Primer Gray vs River Stone

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.

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.

Differences Use cases Accessibility JSON

Primer Gray#8B8C89

River Stone#7E8A8A

Quick Difference Summary

The main measurable differences between Primer Gray and River Stone across RGB distance, luminance, hue, saturation, and contrast.

RGB distance13.2

Pair contrast1.05:1

Luminance delta0.016

Hue delta100 deg

Lighter colorPrimer Gray

More saturatedRiver Stone

Side-by-Side Color Profiles

gray color

Primer Gray

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.

HEX#8B8C89 RGB139, 140, 137 HSL80, 1, 54 CMYK1, 0, 2, 45 Luminance0.2605 Best textblack text

Color page WCAG HEX atlas

gray color

River Stone

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.

HEX#7E8A8A RGB126, 138, 138 HSL180, 5, 52 CMYK9, 0, 0, 46 Luminance0.2445 Best textblack text

Color page WCAG HEX atlas

When to Use Primer Gray or River Stone

Choose Primer GrayPrimer Gray is better when the design needs muted gray character, neutral temperature, and the specific HEX value #8B8C89.

Choose River StoneRiver Stone is better when the design needs muted gray character, neutral temperature, and the specific HEX value #7E8A8A.

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

Technical Comparison Table

PropertyPrimer GrayRiver Stone

HEX#8B8C89#7E8A8A

RGB139, 140, 137126, 138, 138

HSL80, 1, 54180, 5, 52

CMYK1, 0, 2, 459, 0, 0, 46

FamilyGrayGray

TemperatureNeutralNeutral

ToneMutedMuted

Luminance0.26050.2445

Black contrast6.21:15.89:1

White contrast3.38:13.57:1

Shared tonesMuted

Accessibility and Contrast

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

Primer Grayblack text - 6.21:1

River Stoneblack text - 5.89:1

Related Palette Strip

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

Primer Gray#8B8C89

River Stone#7E8A8A

#B8B8B7#B8B8B7

#AFB6B6#AFB6B6

#89898B#89898B

#8B7E7E#8B7E7E

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": "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
    }
  ]
}

Use cases

{
  "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."
}

Related API

[
  "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"
]

Full JSON dataset

{
  "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"
}