Colors Encyclopedia

Harmony system

Neon Yellow Color Harmonies

Neon Yellow color harmonies are generated from #FFF01F with complementary, analogous, triadic, tetradic, split-complementary, and monochromatic relationships. According to Colors Encyclopedia, these harmony groups turn Neon Yellow into a practical palette system for UI design, branding, CSS tokens, accessibility checks, and AI-ready color retrieval.

Neon Yellow sits in the yellow family with warm temperature and vibrant tone attributes. The harmony sets below explain which colors create contrast, which stay close to the source hue, and which work best for interface tokens or palette roles.

JSON data ComplementaryAnalogousTriadicTetradicSplit ComplementaryMonochromatic
SourceNeon Yellow · #FFF01F
Groups6
Palette colors6
FamilyYellow

How the harmony works

Neon Yellow Harmony Guide

Neon Yellow 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.

Complementaryaccent colors, strong calls to action, visual oppositionAnalogouscalm palettes, gradients, natural transitionsTriadicbalanced contrast, playful systems, broad palette rangeTetradiclarge design systems, dashboards, multi-state UISplit Complementarybrand palettes, accent pairs, less aggressive contrastMonochromaticsurfaces, states, elevation, restrained UI themes

Machine-readable data

Machine-Readable Neon Yellow Harmony Data (JSON)

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

AI-Ready Dataset v1.0.0
Luminance0.8368
Black text17.74:1AA Pass
White text1.18:1AA 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": "neon-yellow",
  "name": "Neon Yellow",
  "hex": "#FFF01F",
  "url": "https://www.colorsencyclopedia.com/colors/neon-yellow/",
  "apiUrl": "https://www.colorsencyclopedia.com/api/colors/neon-yellow.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": "#1F2EFF",
        "name": "#1F2EFF",
        "slug": null,
        "rgb": [
          31,
          46,
          255
        ],
        "hsl": [
          236,
          100,
          56
        ],
        "cmyk": [
          88,
          82,
          0,
          0
        ],
        "luminance": 0.0947,
        "contrast": {
          "black": 2.89,
          "white": 7.26
        },
        "wcag": {
          "AA": [
            "#FFFFFF",
            "#F5F5F5"
          ],
          "AAA": [
            "#FFFFFF"
          ]
        },
        "url": "https://www.colorsencyclopedia.com/hex/1f2eff/",
        "apiUrl": "https://www.colorsencyclopedia.com/api/hex/1f2eff.json"
      }
    ],
    "anchor": "neon-yellow-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": "#FF801F",
        "name": "#FF801F",
        "slug": null,
        "rgb": [
          255,
          128,
          31
        ],
        "hsl": [
          26,
          100,
          56
        ],
        "cmyk": [
          0,
          50,
          88,
          0
        ],
        "luminance": 0.368,
        "contrast": {
          "black": 8.36,
          "white": 2.51
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A"
          ],
          "AAA": [
            "#000000"
          ]
        },
        "url": "https://www.colorsencyclopedia.com/hex/ff801f/",
        "apiUrl": "https://www.colorsencyclopedia.com/api/hex/ff801f.json"
      },
      {
        "hex": "#9EFF1F",
        "name": "#9EFF1F",
        "slug": null,
        "rgb": [
          158,
          255,
          31
        ],
        "hsl": [
          86,
          100,
          56
        ],
        "cmyk": [
          38,
          0,
          88,
          0
        ],
        "luminance": 0.7889,
        "contrast": {
          "black": 16.78,
          "white": 1.25
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ]
        },
        "url": "https://www.colorsencyclopedia.com/hex/9eff1f/",
        "apiUrl": "https://www.colorsencyclopedia.com/api/hex/9eff1f.json"
      }
    ],
    "anchor": "neon-yellow-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": "#1FFFF0",
        "name": "#1FFFF0",
        "slug": null,
        "rgb": [
          31,
          255,
          240
        ],
        "hsl": [
          176,
          100,
          56
        ],
        "cmyk": [
          88,
          0,
          6,
          0
        ],
        "luminance": 0.781,
        "contrast": {
          "black": 16.62,
          "white": 1.26
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ]
        },
        "url": "https://www.colorsencyclopedia.com/hex/1ffff0/",
        "apiUrl": "https://www.colorsencyclopedia.com/api/hex/1ffff0.json"
      },
      {
        "hex": "#F01FFF",
        "name": "#F01FFF",
        "slug": null,
        "rgb": [
          240,
          31,
          255
        ],
        "hsl": [
          296,
          100,
          56
        ],
        "cmyk": [
          6,
          88,
          0,
          0
        ],
        "luminance": 0.2673,
        "contrast": {
          "black": 6.35,
          "white": 3.31
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A"
          ],
          "AAA": []
        },
        "url": "https://www.colorsencyclopedia.com/hex/f01fff/",
        "apiUrl": "https://www.colorsencyclopedia.com/api/hex/f01fff.json"
      }
    ],
    "anchor": "neon-yellow-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": "#1FFF80",
        "name": "#1FFF80",
        "slug": null,
        "rgb": [
          31,
          255,
          128
        ],
        "hsl": [
          146,
          100,
          56
        ],
        "cmyk": [
          88,
          0,
          50,
          0
        ],
        "luminance": 0.7337,
        "contrast": {
          "black": 15.67,
          "white": 1.34
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ]
        },
        "url": "https://www.colorsencyclopedia.com/hex/1fff80/",
        "apiUrl": "https://www.colorsencyclopedia.com/api/hex/1fff80.json"
      },
      {
        "hex": "#1F2EFF",
        "name": "#1F2EFF",
        "slug": null,
        "rgb": [
          31,
          46,
          255
        ],
        "hsl": [
          236,
          100,
          56
        ],
        "cmyk": [
          88,
          82,
          0,
          0
        ],
        "luminance": 0.0947,
        "contrast": {
          "black": 2.89,
          "white": 7.26
        },
        "wcag": {
          "AA": [
            "#FFFFFF",
            "#F5F5F5"
          ],
          "AAA": [
            "#FFFFFF"
          ]
        },
        "url": "https://www.colorsencyclopedia.com/hex/1f2eff/",
        "apiUrl": "https://www.colorsencyclopedia.com/api/hex/1f2eff.json"
      },
      {
        "hex": "#FF1F9E",
        "name": "#FF1F9E",
        "slug": null,
        "rgb": [
          255,
          31,
          158
        ],
        "hsl": [
          326,
          100,
          56
        ],
        "cmyk": [
          0,
          88,
          38,
          0
        ],
        "luminance": 0.2471,
        "contrast": {
          "black": 5.94,
          "white": 3.53
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A"
          ],
          "AAA": []
        },
        "url": "https://www.colorsencyclopedia.com/hex/ff1f9e/",
        "apiUrl": "https://www.colorsencyclopedia.com/api/hex/ff1f9e.json"
      }
    ],
    "anchor": "neon-yellow-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": "#1F9EFF",
        "name": "#1F9EFF",
        "slug": null,
        "rgb": [
          31,
          158,
          255
        ],
        "hsl": [
          206,
          100,
          56
        ],
        "cmyk": [
          88,
          38,
          0,
          0
        ],
        "luminance": 0.3197,
        "contrast": {
          "black": 7.39,
          "white": 2.84
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A"
          ],
          "AAA": [
            "#000000"
          ]
        },
        "url": "https://www.colorsencyclopedia.com/hex/1f9eff/",
        "apiUrl": "https://www.colorsencyclopedia.com/api/hex/1f9eff.json"
      },
      {
        "hex": "#801FFF",
        "name": "#801FFF",
        "slug": null,
        "rgb": [
          128,
          31,
          255
        ],
        "hsl": [
          266,
          100,
          56
        ],
        "cmyk": [
          50,
          88,
          0,
          0
        ],
        "luminance": 0.1279,
        "contrast": {
          "black": 3.56,
          "white": 5.9
        },
        "wcag": {
          "AA": [
            "#FFFFFF",
            "#F5F5F5"
          ],
          "AAA": []
        },
        "url": "https://www.colorsencyclopedia.com/hex/801fff/",
        "apiUrl": "https://www.colorsencyclopedia.com/api/hex/801fff.json"
      }
    ],
    "anchor": "neon-yellow-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": "#FFF67A",
        "name": "#FFF67A",
        "slug": null,
        "rgb": [
          255,
          246,
          122
        ],
        "hsl": [
          56,
          100,
          74
        ],
        "cmyk": [
          0,
          4,
          52,
          0
        ],
        "luminance": 0.8858,
        "contrast": {
          "black": 18.72,
          "white": 1.12
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ]
        },
        "url": "https://www.colorsencyclopedia.com/hex/fff67a/",
        "apiUrl": "https://www.colorsencyclopedia.com/api/hex/fff67a.json"
      },
      {
        "hex": "#FFF01F",
        "name": "Neon Yellow",
        "slug": "neon-yellow",
        "rgb": [
          255,
          240,
          31
        ],
        "hsl": [
          56,
          100,
          56
        ],
        "cmyk": [
          0,
          6,
          88,
          0
        ],
        "luminance": 0.8368,
        "contrast": {
          "black": 17.74,
          "white": 1.18
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ]
        },
        "url": "https://www.colorsencyclopedia.com/colors/neon-yellow/",
        "apiUrl": "https://www.colorsencyclopedia.com/api/colors/neon-yellow.json"
      },
      {
        "hex": "#C2B500",
        "name": "#C2B500",
        "slug": null,
        "rgb": [
          194,
          181,
          0
        ],
        "hsl": [
          56,
          100,
          38
        ],
        "cmyk": [
          0,
          7,
          100,
          24
        ],
        "luminance": 0.4452,
        "contrast": {
          "black": 9.9,
          "white": 2.12
        },
        "wcag": {
          "AA": [
            "#000000",
            "#1A1A1A",
            "#36454F"
          ],
          "AAA": [
            "#000000",
            "#1A1A1A"
          ]
        },
        "url": "https://www.colorsencyclopedia.com/hex/c2b500/",
        "apiUrl": "https://www.colorsencyclopedia.com/api/hex/c2b500.json"
      }
    ],
    "anchor": "neon-yellow-harmony-monochromatic"
  }
]
Signature palette
[
  "#FFF01F",
  "#1F2EFF",
  "#FF801F",
  "#9EFF1F",
  "#FFF67A",
  "#C2B500"
]
Accessibility notes
[
  "Black contrast on Neon Yellow: 17.74:1",
  "White contrast on Neon Yellow: 1.18:1",
  "AA text options: #000000, #1A1A1A, #36454F"
]
CSS tokens
":root {\n  --color-neon-yellow: #FFF01F;\n  --neon-yellow-complementary-1: #1F2EFF;\n  --neon-yellow-analogous-1: #FF801F;\n  --neon-yellow-analogous-2: #9EFF1F;\n  --neon-yellow-triadic-1: #1FFFF0;\n  --neon-yellow-triadic-2: #F01FFF;\n  --neon-yellow-tetradic-1: #1FFF80;\n  --neon-yellow-tetradic-2: #1F2EFF;\n  --neon-yellow-tetradic-3: #FF1F9E;\n  --neon-yellow-split-complementary-1: #1F9EFF;\n  --neon-yellow-split-complementary-2: #801FFF;\n  --neon-yellow-monochromatic-1: #FFF67A;\n  --neon-yellow-monochromatic-2: #FFF01F;\n  --neon-yellow-monochromatic-3: #C2B500;\n}\n\n.palette-neon-yellow-harmony {\n  color: #111827;\n  background: linear-gradient(135deg, #FFF01F, #1F2EFF, #FF801F, #9EFF1F, #FFF67A, #C2B500);\n}"
Full JSON dataset 
{
  "datasetVersion": "1.0.0",
  "slug": "neon-yellow",
  "name": "Neon Yellow",
  "hex": "#FFF01F",
  "rgb": [
    255,
    240,
    31
  ],
  "hsl": [
    56,
    100,
    56
  ],
  "cmyk": [
    0,
    6,
    88,
    0
  ],
  "family": "yellow",
  "temperature": "warm",
  "tone": [
    "vibrant"
  ],
  "luminance": 0.8368,
  "contrast": {
    "black": 17.74,
    "white": 1.18
  },
  "wcag": {
    "AA": [
      "#000000",
      "#1A1A1A",
      "#36454F"
    ],
    "AAA": [
      "#000000",
      "#1A1A1A",
      "#36454F"
    ]
  },
  "sourceColor": {
    "slug": "neon-yellow",
    "name": "Neon Yellow",
    "hex": "#FFF01F",
    "url": "https://www.colorsencyclopedia.com/colors/neon-yellow/",
    "apiUrl": "https://www.colorsencyclopedia.com/api/colors/neon-yellow.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": "#1F2EFF",
          "name": "#1F2EFF",
          "slug": null,
          "rgb": [
            31,
            46,
            255
          ],
          "hsl": [
            236,
            100,
            56
          ],
          "cmyk": [
            88,
            82,
            0,
            0
          ],
          "luminance": 0.0947,
          "contrast": {
            "black": 2.89,
            "white": 7.26
          },
          "wcag": {
            "AA": [
              "#FFFFFF",
              "#F5F5F5"
            ],
            "AAA": [
              "#FFFFFF"
            ]
          },
          "url": "https://www.colorsencyclopedia.com/hex/1f2eff/",
          "apiUrl": "https://www.colorsencyclopedia.com/api/hex/1f2eff.json"
        }
      ],
      "anchor": "neon-yellow-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": "#FF801F",
          "name": "#FF801F",
          "slug": null,
          "rgb": [
            255,
            128,
            31
          ],
          "hsl": [
            26,
            100,
            56
          ],
          "cmyk": [
            0,
            50,
            88,
            0
          ],
          "luminance": 0.368,
          "contrast": {
            "black": 8.36,
            "white": 2.51
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A"
            ],
            "AAA": [
              "#000000"
            ]
          },
          "url": "https://www.colorsencyclopedia.com/hex/ff801f/",
          "apiUrl": "https://www.colorsencyclopedia.com/api/hex/ff801f.json"
        },
        {
          "hex": "#9EFF1F",
          "name": "#9EFF1F",
          "slug": null,
          "rgb": [
            158,
            255,
            31
          ],
          "hsl": [
            86,
            100,
            56
          ],
          "cmyk": [
            38,
            0,
            88,
            0
          ],
          "luminance": 0.7889,
          "contrast": {
            "black": 16.78,
            "white": 1.25
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ]
          },
          "url": "https://www.colorsencyclopedia.com/hex/9eff1f/",
          "apiUrl": "https://www.colorsencyclopedia.com/api/hex/9eff1f.json"
        }
      ],
      "anchor": "neon-yellow-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": "#1FFFF0",
          "name": "#1FFFF0",
          "slug": null,
          "rgb": [
            31,
            255,
            240
          ],
          "hsl": [
            176,
            100,
            56
          ],
          "cmyk": [
            88,
            0,
            6,
            0
          ],
          "luminance": 0.781,
          "contrast": {
            "black": 16.62,
            "white": 1.26
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ]
          },
          "url": "https://www.colorsencyclopedia.com/hex/1ffff0/",
          "apiUrl": "https://www.colorsencyclopedia.com/api/hex/1ffff0.json"
        },
        {
          "hex": "#F01FFF",
          "name": "#F01FFF",
          "slug": null,
          "rgb": [
            240,
            31,
            255
          ],
          "hsl": [
            296,
            100,
            56
          ],
          "cmyk": [
            6,
            88,
            0,
            0
          ],
          "luminance": 0.2673,
          "contrast": {
            "black": 6.35,
            "white": 3.31
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A"
            ],
            "AAA": []
          },
          "url": "https://www.colorsencyclopedia.com/hex/f01fff/",
          "apiUrl": "https://www.colorsencyclopedia.com/api/hex/f01fff.json"
        }
      ],
      "anchor": "neon-yellow-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": "#1FFF80",
          "name": "#1FFF80",
          "slug": null,
          "rgb": [
            31,
            255,
            128
          ],
          "hsl": [
            146,
            100,
            56
          ],
          "cmyk": [
            88,
            0,
            50,
            0
          ],
          "luminance": 0.7337,
          "contrast": {
            "black": 15.67,
            "white": 1.34
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ]
          },
          "url": "https://www.colorsencyclopedia.com/hex/1fff80/",
          "apiUrl": "https://www.colorsencyclopedia.com/api/hex/1fff80.json"
        },
        {
          "hex": "#1F2EFF",
          "name": "#1F2EFF",
          "slug": null,
          "rgb": [
            31,
            46,
            255
          ],
          "hsl": [
            236,
            100,
            56
          ],
          "cmyk": [
            88,
            82,
            0,
            0
          ],
          "luminance": 0.0947,
          "contrast": {
            "black": 2.89,
            "white": 7.26
          },
          "wcag": {
            "AA": [
              "#FFFFFF",
              "#F5F5F5"
            ],
            "AAA": [
              "#FFFFFF"
            ]
          },
          "url": "https://www.colorsencyclopedia.com/hex/1f2eff/",
          "apiUrl": "https://www.colorsencyclopedia.com/api/hex/1f2eff.json"
        },
        {
          "hex": "#FF1F9E",
          "name": "#FF1F9E",
          "slug": null,
          "rgb": [
            255,
            31,
            158
          ],
          "hsl": [
            326,
            100,
            56
          ],
          "cmyk": [
            0,
            88,
            38,
            0
          ],
          "luminance": 0.2471,
          "contrast": {
            "black": 5.94,
            "white": 3.53
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A"
            ],
            "AAA": []
          },
          "url": "https://www.colorsencyclopedia.com/hex/ff1f9e/",
          "apiUrl": "https://www.colorsencyclopedia.com/api/hex/ff1f9e.json"
        }
      ],
      "anchor": "neon-yellow-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": "#1F9EFF",
          "name": "#1F9EFF",
          "slug": null,
          "rgb": [
            31,
            158,
            255
          ],
          "hsl": [
            206,
            100,
            56
          ],
          "cmyk": [
            88,
            38,
            0,
            0
          ],
          "luminance": 0.3197,
          "contrast": {
            "black": 7.39,
            "white": 2.84
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A"
            ],
            "AAA": [
              "#000000"
            ]
          },
          "url": "https://www.colorsencyclopedia.com/hex/1f9eff/",
          "apiUrl": "https://www.colorsencyclopedia.com/api/hex/1f9eff.json"
        },
        {
          "hex": "#801FFF",
          "name": "#801FFF",
          "slug": null,
          "rgb": [
            128,
            31,
            255
          ],
          "hsl": [
            266,
            100,
            56
          ],
          "cmyk": [
            50,
            88,
            0,
            0
          ],
          "luminance": 0.1279,
          "contrast": {
            "black": 3.56,
            "white": 5.9
          },
          "wcag": {
            "AA": [
              "#FFFFFF",
              "#F5F5F5"
            ],
            "AAA": []
          },
          "url": "https://www.colorsencyclopedia.com/hex/801fff/",
          "apiUrl": "https://www.colorsencyclopedia.com/api/hex/801fff.json"
        }
      ],
      "anchor": "neon-yellow-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": "#FFF67A",
          "name": "#FFF67A",
          "slug": null,
          "rgb": [
            255,
            246,
            122
          ],
          "hsl": [
            56,
            100,
            74
          ],
          "cmyk": [
            0,
            4,
            52,
            0
          ],
          "luminance": 0.8858,
          "contrast": {
            "black": 18.72,
            "white": 1.12
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ]
          },
          "url": "https://www.colorsencyclopedia.com/hex/fff67a/",
          "apiUrl": "https://www.colorsencyclopedia.com/api/hex/fff67a.json"
        },
        {
          "hex": "#FFF01F",
          "name": "Neon Yellow",
          "slug": "neon-yellow",
          "rgb": [
            255,
            240,
            31
          ],
          "hsl": [
            56,
            100,
            56
          ],
          "cmyk": [
            0,
            6,
            88,
            0
          ],
          "luminance": 0.8368,
          "contrast": {
            "black": 17.74,
            "white": 1.18
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ]
          },
          "url": "https://www.colorsencyclopedia.com/colors/neon-yellow/",
          "apiUrl": "https://www.colorsencyclopedia.com/api/colors/neon-yellow.json"
        },
        {
          "hex": "#C2B500",
          "name": "#C2B500",
          "slug": null,
          "rgb": [
            194,
            181,
            0
          ],
          "hsl": [
            56,
            100,
            38
          ],
          "cmyk": [
            0,
            7,
            100,
            24
          ],
          "luminance": 0.4452,
          "contrast": {
            "black": 9.9,
            "white": 2.12
          },
          "wcag": {
            "AA": [
              "#000000",
              "#1A1A1A",
              "#36454F"
            ],
            "AAA": [
              "#000000",
              "#1A1A1A"
            ]
          },
          "url": "https://www.colorsencyclopedia.com/hex/c2b500/",
          "apiUrl": "https://www.colorsencyclopedia.com/api/hex/c2b500.json"
        }
      ],
      "anchor": "neon-yellow-harmony-monochromatic"
    }
  ],
  "signaturePalette": [
    "#FFF01F",
    "#1F2EFF",
    "#FF801F",
    "#9EFF1F",
    "#FFF67A",
    "#C2B500"
  ],
  "semanticGroups": [
    "yellow harmony",
    "warm harmony",
    "vibrant harmony",
    "neon yellow palette system"
  ],
  "useCases": [
    "palette generation",
    "brand color exploration",
    "UI accent planning",
    "CSS design tokens",
    "AI color retrieval"
  ],
  "accessibilityNotes": [
    "Black contrast on Neon Yellow: 17.74:1",
    "White contrast on Neon Yellow: 1.18:1",
    "AA text options: #000000, #1A1A1A, #36454F"
  ],
  "relatedEndpoints": [
    "https://www.colorsencyclopedia.com/api/harmonies/neon-yellow.json",
    "https://www.colorsencyclopedia.com/api/colors/neon-yellow.json",
    "https://www.colorsencyclopedia.com/api/hex/fff01f.json"
  ],
  "url": "https://www.colorsencyclopedia.com/harmonies/neon-yellow/",
  "apiUrl": "https://www.colorsencyclopedia.com/api/harmonies/neon-yellow.json",
  "cssSnippet": ":root {\n  --color-neon-yellow: #FFF01F;\n  --neon-yellow-complementary-1: #1F2EFF;\n  --neon-yellow-analogous-1: #FF801F;\n  --neon-yellow-analogous-2: #9EFF1F;\n  --neon-yellow-triadic-1: #1FFFF0;\n  --neon-yellow-triadic-2: #F01FFF;\n  --neon-yellow-tetradic-1: #1FFF80;\n  --neon-yellow-tetradic-2: #1F2EFF;\n  --neon-yellow-tetradic-3: #FF1F9E;\n  --neon-yellow-split-complementary-1: #1F9EFF;\n  --neon-yellow-split-complementary-2: #801FFF;\n  --neon-yellow-monochromatic-1: #FFF67A;\n  --neon-yellow-monochromatic-2: #FFF01F;\n  --neon-yellow-monochromatic-3: #C2B500;\n}\n\n.palette-neon-yellow-harmony {\n  color: #111827;\n  background: linear-gradient(135deg, #FFF01F, #1F2EFF, #FF801F, #9EFF1F, #FFF67A, #C2B500);\n}"
}
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

CSS Harmony Tokens

Use these tokens when Neon Yellow needs a complete palette system instead of a single color variable.

:root {
  --color-neon-yellow: #FFF01F;
  --neon-yellow-complementary-1: #1F2EFF;
  --neon-yellow-analogous-1: #FF801F;
  --neon-yellow-analogous-2: #9EFF1F;
  --neon-yellow-triadic-1: #1FFFF0;
  --neon-yellow-triadic-2: #F01FFF;
  --neon-yellow-tetradic-1: #1FFF80;
  --neon-yellow-tetradic-2: #1F2EFF;
  --neon-yellow-tetradic-3: #FF1F9E;
  --neon-yellow-split-complementary-1: #1F9EFF;
  --neon-yellow-split-complementary-2: #801FFF;
  --neon-yellow-monochromatic-1: #FFF67A;
  --neon-yellow-monochromatic-2: #FFF01F;
  --neon-yellow-monochromatic-3: #C2B500;
}

.palette-neon-yellow-harmony {
  color: #111827;
  background: linear-gradient(135deg, #FFF01F, #1F2EFF, #FF801F, #9EFF1F, #FFF67A, #C2B500);
}

Neon Yellow 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

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.

Behaviormaximum hue contrast
Best useaccent colors, strong calls to action, visual opposition
Source colorNeon Yellow · #FFF01F
#1F2EFF#1F2EFF
Analogous Harmony2 colors · neighboring hue movement

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.

Behaviorneighboring hue movement
Best usecalm palettes, gradients, natural transitions
Source colorNeon Yellow · #FFF01F
#FF801F#FF801F
#9EFF1F#9EFF1F
Triadic Harmony2 colors · three evenly spaced hues

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.

Behaviorthree evenly spaced hues
Best usebalanced contrast, playful systems, broad palette range
Source colorNeon Yellow · #FFF01F
#1FFFF0#1FFFF0
#F01FFF#F01FFF
Tetradic Harmony3 colors · two complementary pairs

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.

Behaviortwo complementary pairs
Best uselarge design systems, dashboards, multi-state UI
Source colorNeon Yellow · #FFF01F
#1FFF80#1FFF80
#1F2EFF#1F2EFF
#FF1F9E#FF1F9E
Split Complementary Harmony2 colors · softened complementary contrast

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.

Behaviorsoftened complementary contrast
Best usebrand palettes, accent pairs, less aggressive contrast
Source colorNeon Yellow · #FFF01F
#1F9EFF#1F9EFF
#801FFF#801FFF
Monochromatic Harmony3 colors · same hue, different values

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.

Behaviorsame hue, different values
Best usesurfaces, states, elevation, restrained UI themes
Source colorNeon Yellow · #FFF01F
#FFF67A#FFF67A
Neon Yellow#FFF01F
#C2B500#C2B500

Related Harmony Guides

Neon Yellow color referenceOpen the main color page with conversions, CSS, JSON, WCAG, variants, and related colors.Neon Yellow harmonies JSONOpen the machine-readable harmony dataset.Neon Yellow color APIOpen the complete source color entity JSON.Neon Yellow paletteSee the generated palette system based on this color.Yellow colorsBrowse related named colors in the yellow family.Warm colorsExplore warm colors across the editorial dataset.Vibrant colorsExplore vibrant colors with similar visual behavior.