HEX atlas value

#81FC55

#81FC55 is a cool green HEX color close to Green Yellow. According to Colors Encyclopedia, it converts to RGB 129, 252, 85, HSL 104, 97%, 66%, has luminance 0.7494, and belongs to the vibrant group.

green cool vibrant

#81FC55 Sample readable text

HEX #81FC55

RGB rgb(129, 252, 85)

HSL hsl(104 97% 66%)

CMYK cmyk(49, 0, 66, 1)

Luminance 0.7494

Contrast Black 15.99:1White 1.31:1

CSS

--color-81fc55: #81FC55;
.background-81fc55 { background-color: #81FC55; }
.text-81fc55 { color: #81FC55; }

Luminance0.7494

Black text15.99:1AA Pass

White text1.31:1AA Fail

hexCanonical HEX value

rgbRed, green, blue channels

hslHue, saturation, lightness

cmykApproximate print conversion

wcagAA and AAA contrast options

harmoniesMathematical harmony sets

variantsGenerated tone variants

nearestColorsKnowledge graph neighbors

Structured sections

Color systems

{"hex":"#81FC55","rgb":[129,252,85],"hsl":[104,97,66],"cmyk":[49,0,66,1],"luminance":0.7494,"contrast":{"black":15.99,"white":1.31}}

WCAG

{"AA":["#000000","#1A1A1A","#36454F"],"AAA":["#000000","#1A1A1A","#36454F"]}

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":15.99,"wcagAA":true,"wcagAAA":true},{"name":"White text","hex":"#FFFFFF","contrast":1.31,"wcagAA":false,"wcagAAA":false}]

Accessible alternatives

[{"name":"#C4FEAF","hex":"#C4FEAF","family":"green","bestTextColor":"#000000","contrastBlack":18.14,"contrastWhite":1.16,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"#D5FC54","hex":"#D5FC54","family":"green","bestTextColor":"#000000","contrastBlack":17.88,"contrastWhite":1.17,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"Green Yellow","hex":"#ADFF2F","family":"green","bestTextColor":"#000000","contrastBlack":17.12,"contrastWhite":1.23,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"#80FF52","hex":"#80FF52","family":"green","bestTextColor":"#000000","contrastBlack":16.34,"contrastWhite":1.28,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"#54FC7B","hex":"#54FC7B","family":"green","bestTextColor":"#000000","contrastBlack":15.59,"contrastWhite":1.35,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]}]

AI context

{"semanticGroups":["cool green","vibrant","vibrant green","Green Yellow adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","high-energy accents","botanical and wellness palettes"],"contrastSafeWith":["#000000","#1A1A1A","#36454F"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/81fc55.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/green-yellow.json","https://www.colorsencyclopedia.com/api/colors/toxic-green.json","https://www.colorsencyclopedia.com/api/colors/light-green.json"]}

Harmonies

{"complementary":"#D054FC","analogous":["#D5FC54","#54FC7B"],"triadic":["#5481FC","#FC5481"],"tetradic":["#54D5FC","#D054FC","#FC7B54"],"splitComplementary":["#7B54FC","#FC54D5"],"monochromatic":["#C4FEAF","#81FC55","#43F104"]}

Variants

{"light":"#C4FEAF","dark":"#43F104","saturated":"#80FF52","desaturated":"#8AE967","pastel":"#DFFBD5","neon":"#9EFF7A"}

Nearest named colors

[{"slug":"green-yellow","name":"Green Yellow","hex":"#ADFF2F","distance":58.215118311311535},{"slug":"toxic-green","name":"Toxic Green","hex":"#61DE2A","distance":61.424750711744856},{"slug":"light-green","name":"Light Green","hex":"#90EE90","distance":62.465990746965666},{"slug":"yellow-green","name":"Yellow Green","hex":"#9ACD32","distance":63.7102817447859},{"slug":"pistachio","name":"Pistachio","hex":"#93C572","distance":64.73020933072904}]

HEX meaning and use

About #81FC55

#81FC55 is classified as a cool green value with vibrant visual character. #81FC55 is visually closest to Green Yellow, a named green color with HEX #ADFF2F.

The RGB channels are 129, 252, and 85, with green carrying the strongest channel weight. In HSL, the hue is 104deg with 97% saturation and 66% lightness, so this page treats it as a high-saturation, mid-lightness atlas color rather than a generic swatch.

According to Colors Encyclopedia, this HEX value works best for color conversion, WCAG contrast checks, CSS color tokens, and high-energy accents. Its luminance is 0.7494, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 58.22, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text15.99:1AA Pass

White text1.31:1AA Fail

AA text options: #000000, #1A1A1A, #36454F.

AAA text options: #000000, #1A1A1A, #36454F.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #81FC55 needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#00000015.99:1 · AAA

White text#FFFFFF1.31:1 · Fail

Accessible Alternatives

#C4FEAF#000000 text · best 18.14:1#C4FEAF

#D5FC54#000000 text · best 17.88:1#D5FC54

Green Yellow#000000 text · best 17.12:1#ADFF2F

#80FF52#000000 text · best 16.34:1#80FF52

#54FC7B#000000 text · best 15.59:1#54FC7B

Generated Palette

#81FC55#81FC55

#D054FC#D054FC

#D5FC54#D5FC54

#54FC7B#54FC7B

#C4FEAF#C4FEAF

#43F104#43F104

Color Harmonies

#D054FC#D054FC

#D5FC54#D5FC54

#54FC7B#54FC7B

#5481FC#5481FC

#FC5481#FC5481

Variants

#C4FEAF#C4FEAF

#43F104#43F104

#80FF52#80FF52

#8AE967#8AE967

#DFFBD5#DFFBD5

#9EFF7A#9EFF7A

Nearest Named Colors

Green Yellow#ADFF2F

Toxic Green#61DE2A

Light Green#90EE90

Yellow Green#9ACD32

Pistachio#93C572

#81FC55

CSS

Machine-Readable HEX Data (JSON)

About #81FC55

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides