Harmony system

Cool White Color Harmonies

Cool White harmonies from #F4F8FF: complementary #FFFBF5, plus five harmony groups with CSS and contrast data.

Cool White is a cool blue at hue 218°, saturation 100% and lightness 98%. The sets below keep those measurements visible while moving around the color wheel, making it easier to choose close hues, direct contrast or a wider token system.

SourceCool White · #F4F8FF
Groups6
Palette colors6
FamilyBlue

How the harmony works

Cool White Harmony Guide

Cool White harmonies are computed from hue relationships rather than subjective palette names. Complementary colors create direct contrast, analogous colors stay close to the source hue, triadic and tetradic groups add broader palette range, split-complementary colors soften contrast, and monochromatic variants keep the same hue for UI surfaces and states.

Machine-readable data

Machine-Readable Cool White Harmony Data (JSON)

Structured harmony groups, source color metadata, CSS tokens, accessibility notes, and related API endpoints for Cool White.

AI-Ready Dataset v1.0.0
Luminance0.9359
Black text19.72:1AA Pass
White text1.07:1AA Fail
sourceColorCanonical source color
harmonyGroupsComplementary, analogous, triadic, tetradic, split-complementary, and monochromatic sets
signaturePaletteCompact harmony preview palette
semanticGroupsAI-ready harmony labels
useCasesDesign and retrieval contexts
accessibilityNotesContrast guidance for the source color
Download JSON Open API
Structured sections
Source color
{
  "slug": "cool-white",
  "name": "Cool White",
  "hex": "#F4F8FF",
  "url": "https://www.colorsencyclopedia.com/colors/cool-white/",
  "apiUrl": "https://www.colorsencyclopedia.com/api/colors/cool-white.json"
}
Harmony groups
[
  {
    "key": "complementary",
    "label": "Complementary",
    "behavior": "maximum hue contrast",
    "bestUse": "accent colors, strong calls to action, visual opposition",
    "description": "Complementary harmony uses the color opposite the source hue. It creates the strongest direct relationship in the wheel, so it is best for accents, contrast anchors, and palettes that need immediate separation.",
    "colors": [
      {
        "hex": "#FFFBF5",
        "name": "#FFFBF5",
        "slug": null,
        "rgb": [
          255,
          251,
          245
        ],
        "hsl": [
          36,
          100,
          98
        ],
        "cmyk": [
          0,
          2,
          4,
          0
        ],
        "luminance": 0.9685,
        "contrast": {
          "black": 20.37,
          "white": 1.03
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ]
        },
        "url": null,
        "apiUrl": null
      }
    ],
    "anchor": "cool-white-harmony-complementary"
  },
  {
    "key": "analogous",
    "label": "Analogous",
    "behavior": "neighboring hue movement",
    "bestUse": "calm palettes, gradients, natural transitions",
    "description": "Analogous harmony uses hues close to the source color. It keeps the palette visually connected and is useful for quiet interfaces, editorial color systems, and smooth background or gradient work.",
    "colors": [
      {
        "hex": "#F5FEFF",
        "name": "#F5FEFF",
        "slug": null,
        "rgb": [
          245,
          254,
          255
        ],
        "hsl": [
          186,
          100,
          98
        ],
        "cmyk": [
          4,
          0,
          0,
          0
        ],
        "luminance": 0.9752,
        "contrast": {
          "black": 20.5,
          "white": 1.02
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ]
        },
        "url": null,
        "apiUrl": null
      },
      {
        "hex": "#F6F5FF",
        "name": "#F6F5FF",
        "slug": null,
        "rgb": [
          246,
          245,
          255
        ],
        "hsl": [
          246,
          100,
          98
        ],
        "cmyk": [
          4,
          4,
          0,
          0
        ],
        "luminance": 0.9212,
        "contrast": {
          "black": 19.42,
          "white": 1.08
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ]
        },
        "url": null,
        "apiUrl": null
      }
    ],
    "anchor": "cool-white-harmony-analogous"
  },
  {
    "key": "triadic",
    "label": "Triadic",
    "behavior": "three evenly spaced hues",
    "bestUse": "balanced contrast, playful systems, broad palette range",
    "description": "Triadic harmony places colors around the wheel at equal intervals. It gives more range than analogous harmony while keeping a stable mathematical relationship between the selected hues.",
    "colors": [
      {
        "hex": "#FFF5F9",
        "name": "#FFF5F9",
        "slug": null,
        "rgb": [
          255,
          245,
          249
        ],
        "hsl": [
          336,
          100,
          98
        ],
        "cmyk": [
          0,
          4,
          2,
          0
        ],
        "luminance": 0.934,
        "contrast": {
          "black": 19.68,
          "white": 1.07
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ]
        },
        "url": null,
        "apiUrl": null
      },
      {
        "hex": "#F9FFF5",
        "name": "#F9FFF5",
        "slug": null,
        "rgb": [
          249,
          255,
          245
        ],
        "hsl": [
          96,
          100,
          98
        ],
        "cmyk": [
          2,
          0,
          4,
          0
        ],
        "luminance": 0.9825,
        "contrast": {
          "black": 20.65,
          "white": 1.02
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ]
        },
        "url": null,
        "apiUrl": null
      }
    ],
    "anchor": "cool-white-harmony-triadic"
  },
  {
    "key": "tetradic",
    "label": "Tetradic",
    "behavior": "two complementary pairs",
    "bestUse": "large design systems, dashboards, multi-state UI",
    "description": "Tetradic harmony creates a four-color system from two complementary relationships. It is useful when a palette needs multiple roles, but the colors should be assigned carefully so one hue remains dominant.",
    "colors": [
      {
        "hex": "#FFF5FE",
        "name": "#FFF5FE",
        "slug": null,
        "rgb": [
          255,
          245,
          254
        ],
        "hsl": [
          306,
          100,
          98
        ],
        "cmyk": [
          0,
          4,
          0,
          0
        ],
        "luminance": 0.9372,
        "contrast": {
          "black": 19.74,
          "white": 1.06
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ]
        },
        "url": null,
        "apiUrl": null
      },
      {
        "hex": "#FFFBF5",
        "name": "#FFFBF5",
        "slug": null,
        "rgb": [
          255,
          251,
          245
        ],
        "hsl": [
          36,
          100,
          98
        ],
        "cmyk": [
          0,
          2,
          4,
          0
        ],
        "luminance": 0.9685,
        "contrast": {
          "black": 20.37,
          "white": 1.03
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ]
        },
        "url": null,
        "apiUrl": null
      },
      {
        "hex": "#F5FFF6",
        "name": "#F5FFF6",
        "slug": null,
        "rgb": [
          245,
          255,
          246
        ],
        "hsl": [
          126,
          100,
          98
        ],
        "cmyk": [
          4,
          0,
          4,
          0
        ],
        "luminance": 0.9759,
        "contrast": {
          "black": 20.52,
          "white": 1.02
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ]
        },
        "url": null,
        "apiUrl": null
      }
    ],
    "anchor": "cool-white-harmony-tetradic"
  },
  {
    "key": "splitComplementary",
    "label": "Split Complementary",
    "behavior": "softened complementary contrast",
    "bestUse": "brand palettes, accent pairs, less aggressive contrast",
    "description": "Split-complementary harmony replaces the direct opposite with the two hues beside it. This keeps useful contrast while reducing the visual tension of a pure complementary pair.",
    "colors": [
      {
        "hex": "#FFF6F5",
        "name": "#FFF6F5",
        "slug": null,
        "rgb": [
          255,
          246,
          245
        ],
        "hsl": [
          6,
          100,
          98
        ],
        "cmyk": [
          0,
          4,
          4,
          0
        ],
        "luminance": 0.9376,
        "contrast": {
          "black": 19.75,
          "white": 1.06
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ]
        },
        "url": null,
        "apiUrl": null
      },
      {
        "hex": "#FEFFF5",
        "name": "#FEFFF5",
        "slug": null,
        "rgb": [
          254,
          255,
          245
        ],
        "hsl": [
          66,
          100,
          98
        ],
        "cmyk": [
          0,
          0,
          4,
          0
        ],
        "luminance": 0.9918,
        "contrast": {
          "black": 20.84,
          "white": 1.01
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ]
        },
        "url": null,
        "apiUrl": null
      }
    ],
    "anchor": "cool-white-harmony-split-complementary"
  },
  {
    "key": "monochromatic",
    "label": "Monochromatic",
    "behavior": "same hue, different values",
    "bestUse": "surfaces, states, elevation, restrained UI themes",
    "description": "Monochromatic harmony keeps the source hue and changes lightness. It is the safest system for tonal UI, cards, hover states, shadows, backgrounds, and subtle visual hierarchy.",
    "colors": [
      {
        "hex": "#FFFFFF",
        "name": "White",
        "slug": "white",
        "rgb": [
          255,
          255,
          255
        ],
        "hsl": [
          0,
          0,
          100
        ],
        "cmyk": [
          0,
          0,
          0,
          0
        ],
        "luminance": 1,
        "contrast": {
          "black": 21,
          "white": 1
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ]
        },
        "url": "https://www.colorsencyclopedia.com/colors/white/",
        "apiUrl": "https://www.colorsencyclopedia.com/api/colors/white.json"
      },
      {
        "hex": "#F4F8FF",
        "name": "Cool White",
        "slug": "cool-white",
        "rgb": [
          244,
          248,
          255
        ],
        "hsl": [
          218,
          100,
          98
        ],
        "cmyk": [
          4,
          3,
          0,
          0
        ],
        "luminance": 0.9359,
        "contrast": {
          "black": 19.72,
          "white": 1.07
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ]
        },
        "url": "https://www.colorsencyclopedia.com/colors/cool-white/",
        "apiUrl": "https://www.colorsencyclopedia.com/api/colors/cool-white.json"
      },
      {
        "hex": "#99BEFF",
        "name": "#99BEFF",
        "slug": null,
        "rgb": [
          153,
          190,
          255
        ],
        "hsl": [
          218,
          100,
          80
        ],
        "cmyk": [
          40,
          25,
          0,
          0
        ],
        "luminance": 0.5082,
        "contrast": {
          "black": 11.16,
          "white": 1.88
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A"
          ]
        },
        "url": null,
        "apiUrl": null
      }
    ],
    "anchor": "cool-white-harmony-monochromatic"
  }
]
Signature palette
[
  "#F4F8FF",
  "#FFFBF5",
  "#F5FEFF",
  "#F6F5FF",
  "#FFFFFF",
  "#99BEFF"
]
Accessibility notes
[
  "Black contrast on Cool White: 19.72:1",
  "White contrast on Cool White: 1.07:1",
  "AA text options: #000000, #1A1A1A, #36454F"
]
CSS tokens
":root {\n  --color-cool-white: #F4F8FF;\n  --cool-white-complementary-1: #FFFBF5;\n  --cool-white-analogous-1: #F5FEFF;\n  --cool-white-analogous-2: #F6F5FF;\n  --cool-white-triadic-1: #FFF5F9;\n  --cool-white-triadic-2: #F9FFF5;\n  --cool-white-tetradic-1: #FFF5FE;\n  --cool-white-tetradic-2: #FFFBF5;\n  --cool-white-tetradic-3: #F5FFF6;\n  --cool-white-split-complementary-1: #FFF6F5;\n  --cool-white-split-complementary-2: #FEFFF5;\n  --cool-white-monochromatic-1: #FFFFFF;\n  --cool-white-monochromatic-2: #F4F8FF;\n  --cool-white-monochromatic-3: #99BEFF;\n}\n\n.palette-cool-white-harmony {\n  color: #111827;\n  background: linear-gradient(135deg, #F4F8FF, #FFFBF5, #F5FEFF, #F6F5FF, #FFFFFF, #99BEFF);\n}"
Full JSON dataset
{
  "datasetVersion": "1.0.0",
  "slug": "cool-white",
  "name": "Cool White",
  "hex": "#F4F8FF",
  "rgb": [
    244,
    248,
    255
  ],
  "hsl": [
    218,
    100,
    98
  ],
  "cmyk": [
    4,
    3,
    0,
    0
  ],
  "family": "blue",
  "temperature": "cool",
  "tone": [
    "light",
    "pastel"
  ],
  "luminance": 0.9359,
  "contrast": {
    "black": 19.72,
    "white": 1.07
  },
  "wcag": {
    "AA": [
      "#000000",
      "#1A1A1A",
      "#36454F"
    ],
    "AAA": [
      "#000000",
      "#1A1A1A",
      "#36454F"
    ]
  },
  "sourceColor": {
    "slug": "cool-white",
    "name": "Cool White",
    "hex": "#F4F8FF",
    "url": "https://www.colorsencyclopedia.com/colors/cool-white/",
    "apiUrl": "https://www.colorsencyclopedia.com/api/colors/cool-white.json"
  },
  "harmonyGroups": [
    {
      "key": "complementary",
      "label": "Complementary",
      "behavior": "maximum hue contrast",
      "bestUse": "accent colors, strong calls to action, visual opposition",
      "description": "Complementary harmony uses the color opposite the source hue. It creates the strongest direct relationship in the wheel, so it is best for accents, contrast anchors, and palettes that need immediate separation.",
      "colors": [
        {
          "hex": "#FFFBF5",
          "name": "#FFFBF5",
          "slug": null,
          "rgb": [
            255,
            251,
            245
          ],
          "hsl": [
            36,
            100,
            98
          ],
          "cmyk": [
            0,
            2,
            4,
            0
          ],
          "luminance": 0.9685,
          "contrast": {
            "black": 20.37,
            "white": 1.03
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ]
          },
          "url": null,
          "apiUrl": null
        }
      ],
      "anchor": "cool-white-harmony-complementary"
    },
    {
      "key": "analogous",
      "label": "Analogous",
      "behavior": "neighboring hue movement",
      "bestUse": "calm palettes, gradients, natural transitions",
      "description": "Analogous harmony uses hues close to the source color. It keeps the palette visually connected and is useful for quiet interfaces, editorial color systems, and smooth background or gradient work.",
      "colors": [
        {
          "hex": "#F5FEFF",
          "name": "#F5FEFF",
          "slug": null,
          "rgb": [
            245,
            254,
            255
          ],
          "hsl": [
            186,
            100,
            98
          ],
          "cmyk": [
            4,
            0,
            0,
            0
          ],
          "luminance": 0.9752,
          "contrast": {
            "black": 20.5,
            "white": 1.02
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ]
          },
          "url": null,
          "apiUrl": null
        },
        {
          "hex": "#F6F5FF",
          "name": "#F6F5FF",
          "slug": null,
          "rgb": [
            246,
            245,
            255
          ],
          "hsl": [
            246,
            100,
            98
          ],
          "cmyk": [
            4,
            4,
            0,
            0
          ],
          "luminance": 0.9212,
          "contrast": {
            "black": 19.42,
            "white": 1.08
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ]
          },
          "url": null,
          "apiUrl": null
        }
      ],
      "anchor": "cool-white-harmony-analogous"
    },
    {
      "key": "triadic",
      "label": "Triadic",
      "behavior": "three evenly spaced hues",
      "bestUse": "balanced contrast, playful systems, broad palette range",
      "description": "Triadic harmony places colors around the wheel at equal intervals. It gives more range than analogous harmony while keeping a stable mathematical relationship between the selected hues.",
      "colors": [
        {
          "hex": "#FFF5F9",
          "name": "#FFF5F9",
          "slug": null,
          "rgb": [
            255,
            245,
            249
          ],
          "hsl": [
            336,
            100,
            98
          ],
          "cmyk": [
            0,
            4,
            2,
            0
          ],
          "luminance": 0.934,
          "contrast": {
            "black": 19.68,
            "white": 1.07
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ]
          },
          "url": null,
          "apiUrl": null
        },
        {
          "hex": "#F9FFF5",
          "name": "#F9FFF5",
          "slug": null,
          "rgb": [
            249,
            255,
            245
          ],
          "hsl": [
            96,
            100,
            98
          ],
          "cmyk": [
            2,
            0,
            4,
            0
          ],
          "luminance": 0.9825,
          "contrast": {
            "black": 20.65,
            "white": 1.02
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ]
          },
          "url": null,
          "apiUrl": null
        }
      ],
      "anchor": "cool-white-harmony-triadic"
    },
    {
      "key": "tetradic",
      "label": "Tetradic",
      "behavior": "two complementary pairs",
      "bestUse": "large design systems, dashboards, multi-state UI",
      "description": "Tetradic harmony creates a four-color system from two complementary relationships. It is useful when a palette needs multiple roles, but the colors should be assigned carefully so one hue remains dominant.",
      "colors": [
        {
          "hex": "#FFF5FE",
          "name": "#FFF5FE",
          "slug": null,
          "rgb": [
            255,
            245,
            254
          ],
          "hsl": [
            306,
            100,
            98
          ],
          "cmyk": [
            0,
            4,
            0,
            0
          ],
          "luminance": 0.9372,
          "contrast": {
            "black": 19.74,
            "white": 1.06
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ]
          },
          "url": null,
          "apiUrl": null
        },
        {
          "hex": "#FFFBF5",
          "name": "#FFFBF5",
          "slug": null,
          "rgb": [
            255,
            251,
            245
          ],
          "hsl": [
            36,
            100,
            98
          ],
          "cmyk": [
            0,
            2,
            4,
            0
          ],
          "luminance": 0.9685,
          "contrast": {
            "black": 20.37,
            "white": 1.03
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ]
          },
          "url": null,
          "apiUrl": null
        },
        {
          "hex": "#F5FFF6",
          "name": "#F5FFF6",
          "slug": null,
          "rgb": [
            245,
            255,
            246
          ],
          "hsl": [
            126,
            100,
            98
          ],
          "cmyk": [
            4,
            0,
            4,
            0
          ],
          "luminance": 0.9759,
          "contrast": {
            "black": 20.52,
            "white": 1.02
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ]
          },
          "url": null,
          "apiUrl": null
        }
      ],
      "anchor": "cool-white-harmony-tetradic"
    },
    {
      "key": "splitComplementary",
      "label": "Split Complementary",
      "behavior": "softened complementary contrast",
      "bestUse": "brand palettes, accent pairs, less aggressive contrast",
      "description": "Split-complementary harmony replaces the direct opposite with the two hues beside it. This keeps useful contrast while reducing the visual tension of a pure complementary pair.",
      "colors": [
        {
          "hex": "#FFF6F5",
          "name": "#FFF6F5",
          "slug": null,
          "rgb": [
            255,
            246,
            245
          ],
          "hsl": [
            6,
            100,
            98
          ],
          "cmyk": [
            0,
            4,
            4,
            0
          ],
          "luminance": 0.9376,
          "contrast": {
            "black": 19.75,
            "white": 1.06
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ]
          },
          "url": null,
          "apiUrl": null
        },
        {
          "hex": "#FEFFF5",
          "name": "#FEFFF5",
          "slug": null,
          "rgb": [
            254,
            255,
            245
          ],
          "hsl": [
            66,
            100,
            98
          ],
          "cmyk": [
            0,
            0,
            4,
            0
          ],
          "luminance": 0.9918,
          "contrast": {
            "black": 20.84,
            "white": 1.01
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ]
          },
          "url": null,
          "apiUrl": null
        }
      ],
      "anchor": "cool-white-harmony-split-complementary"
    },
    {
      "key": "monochromatic",
      "label": "Monochromatic",
      "behavior": "same hue, different values",
      "bestUse": "surfaces, states, elevation, restrained UI themes",
      "description": "Monochromatic harmony keeps the source hue and changes lightness. It is the safest system for tonal UI, cards, hover states, shadows, backgrounds, and subtle visual hierarchy.",
      "colors": [
        {
          "hex": "#FFFFFF",
          "name": "White",
          "slug": "white",
          "rgb": [
            255,
            255,
            255
          ],
          "hsl": [
            0,
            0,
            100
          ],
          "cmyk": [
            0,
            0,
            0,
            0
          ],
          "luminance": 1,
          "contrast": {
            "black": 21,
            "white": 1
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ]
          },
          "url": "https://www.colorsencyclopedia.com/colors/white/",
          "apiUrl": "https://www.colorsencyclopedia.com/api/colors/white.json"
        },
        {
          "hex": "#F4F8FF",
          "name": "Cool White",
          "slug": "cool-white",
          "rgb": [
            244,
            248,
            255
          ],
          "hsl": [
            218,
            100,
            98
          ],
          "cmyk": [
            4,
            3,
            0,
            0
          ],
          "luminance": 0.9359,
          "contrast": {
            "black": 19.72,
            "white": 1.07
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ]
          },
          "url": "https://www.colorsencyclopedia.com/colors/cool-white/",
          "apiUrl": "https://www.colorsencyclopedia.com/api/colors/cool-white.json"
        },
        {
          "hex": "#99BEFF",
          "name": "#99BEFF",
          "slug": null,
          "rgb": [
            153,
            190,
            255
          ],
          "hsl": [
            218,
            100,
            80
          ],
          "cmyk": [
            40,
            25,
            0,
            0
          ],
          "luminance": 0.5082,
          "contrast": {
            "black": 11.16,
            "white": 1.88
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A"
            ]
          },
          "url": null,
          "apiUrl": null
        }
      ],
      "anchor": "cool-white-harmony-monochromatic"
    }
  ],
  "signaturePalette": [
    "#F4F8FF",
    "#FFFBF5",
    "#F5FEFF",
    "#F6F5FF",
    "#FFFFFF",
    "#99BEFF"
  ],
  "semanticGroups": [
    "blue harmony",
    "cool harmony",
    "light harmony",
    "pastel harmony",
    "cool white palette system"
  ],
  "useCases": [
    "palette generation",
    "brand color exploration",
    "UI accent planning",
    "CSS design tokens",
    "AI color retrieval"
  ],
  "accessibilityNotes": [
    "Black contrast on Cool White: 19.72:1",
    "White contrast on Cool White: 1.07:1",
    "AA text options: #000000, #1A1A1A, #36454F"
  ],
  "relatedEndpoints": [
    "https://www.colorsencyclopedia.com/api/harmonies/cool-white.json",
    "https://www.colorsencyclopedia.com/api/colors/cool-white.json",
    "https://www.colorsencyclopedia.com/api/hex/f4f8ff.json"
  ],
  "url": "https://www.colorsencyclopedia.com/harmonies/cool-white/",
  "apiUrl": "https://www.colorsencyclopedia.com/api/harmonies/cool-white.json",
  "cssSnippet": ":root {\n  --color-cool-white: #F4F8FF;\n  --cool-white-complementary-1: #FFFBF5;\n  --cool-white-analogous-1: #F5FEFF;\n  --cool-white-analogous-2: #F6F5FF;\n  --cool-white-triadic-1: #FFF5F9;\n  --cool-white-triadic-2: #F9FFF5;\n  --cool-white-tetradic-1: #FFF5FE;\n  --cool-white-tetradic-2: #FFFBF5;\n  --cool-white-tetradic-3: #F5FFF6;\n  --cool-white-split-complementary-1: #FFF6F5;\n  --cool-white-split-complementary-2: #FEFFF5;\n  --cool-white-monochromatic-1: #FFFFFF;\n  --cool-white-monochromatic-2: #F4F8FF;\n  --cool-white-monochromatic-3: #99BEFF;\n}\n\n.palette-cool-white-harmony {\n  color: #111827;\n  background: linear-gradient(135deg, #F4F8FF, #FFFBF5, #F5FEFF, #F6F5FF, #FFFFFF, #99BEFF);\n}"
}

CSS Harmony Tokens

Use these tokens when Cool White needs a complete palette system instead of a single color variable.

:root {
  --color-cool-white: #F4F8FF;
  --cool-white-complementary-1: #FFFBF5;
  --cool-white-analogous-1: #F5FEFF;
  --cool-white-analogous-2: #F6F5FF;
  --cool-white-triadic-1: #FFF5F9;
  --cool-white-triadic-2: #F9FFF5;
  --cool-white-tetradic-1: #FFF5FE;
  --cool-white-tetradic-2: #FFFBF5;
  --cool-white-tetradic-3: #F5FFF6;
  --cool-white-split-complementary-1: #FFF6F5;
  --cool-white-split-complementary-2: #FEFFF5;
  --cool-white-monochromatic-1: #FFFFFF;
  --cool-white-monochromatic-2: #F4F8FF;
  --cool-white-monochromatic-3: #99BEFF;
}

.palette-cool-white-harmony {
  color: #111827;
  background: linear-gradient(135deg, #F4F8FF, #FFFBF5, #F5FEFF, #F6F5FF, #FFFFFF, #99BEFF);
}

Cool White Harmony Groups

Open a group to inspect its generated colors, intended behavior, and best design use. Anchor links above open the matching group directly.

Complementary Harmony1 colors · maximum hue contrast

The complementary set starts from Cool White #F4F8FF and produces #FFFBF5. Its maximum hue contrast relationship suits accent colors, strong calls to action, and visual opposition. None of these generated values has an exact named-color match in the current dataset.

Behaviormaximum hue contrast
Best useaccent colors, strong calls to action, visual opposition
Source colorCool White · #F4F8FF
Analogous Harmony2 colors · neighboring hue movement

The analogous set starts from Cool White #F4F8FF and produces #F5FEFF and #F6F5FF. Its neighboring hue movement relationship suits calm palettes, gradients, and natural transitions. None of these generated values has an exact named-color match in the current dataset.

Behaviorneighboring hue movement
Best usecalm palettes, gradients, natural transitions
Source colorCool White · #F4F8FF
Triadic Harmony2 colors · three evenly spaced hues

The triadic set starts from Cool White #F4F8FF and produces #FFF5F9 and #F9FFF5. Its three evenly spaced hues relationship suits balanced contrast, playful systems, and broad palette range. None of these generated values has an exact named-color match in the current dataset.

Behaviorthree evenly spaced hues
Best usebalanced contrast, playful systems, broad palette range
Source colorCool White · #F4F8FF
Tetradic Harmony3 colors · two complementary pairs

The tetradic set starts from Cool White #F4F8FF and produces #FFF5FE, #FFFBF5, and #F5FFF6. Its two complementary pairs relationship suits large design systems, dashboards, and multi-state UI. None of these generated values has an exact named-color match in the current dataset.

Behaviortwo complementary pairs
Best uselarge design systems, dashboards, multi-state UI
Source colorCool White · #F4F8FF
Split Complementary Harmony2 colors · softened complementary contrast

The split complementary set starts from Cool White #F4F8FF and produces #FFF6F5 and #FEFFF5. Its softened complementary contrast relationship suits brand palettes, accent pairs, and less aggressive contrast. None of these generated values has an exact named-color match in the current dataset.

Behaviorsoftened complementary contrast
Best usebrand palettes, accent pairs, less aggressive contrast
Source colorCool White · #F4F8FF
Monochromatic Harmony3 colors · same hue, different values

The monochromatic set starts from Cool White #F4F8FF and produces #FFFFFF, #F4F8FF, and #99BEFF. Its same hue, different values relationship suits surfaces, states, elevation, and restrained UI themes. The generated values match White and Cool White in the named-color dataset.

Behaviorsame hue, different values
Best usesurfaces, states, elevation, restrained UI themes
Source colorCool White · #F4F8FF