HEX atlas value

#66FC55

#66FC55 is a cool green HEX color close to Toxic Green. According to Colors Encyclopedia, it converts to RGB 102, 252, 85, HSL 114, 97%, 66%, has luminance 0.731, and belongs to the vibrant group.

green cool vibrant

#66FC55 Sample readable text

HEX #66FC55

RGB rgb(102, 252, 85)

HSL hsl(114 97% 66%)

CMYK cmyk(60, 0, 66, 1)

Luminance 0.731

Contrast Black 15.62:1White 1.34:1

CSS

--color-66fc55: #66FC55;
.background-66fc55 { background-color: #66FC55; }
.text-66fc55 { color: #66FC55; }

Luminance0.731

Black text15.62:1AA Pass

White text1.34:1AA 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":"#66FC55","rgb":[102,252,85],"hsl":[114,97,66],"cmyk":[60,0,66,1],"luminance":0.731,"contrast":{"black":15.62,"white":1.34}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":15.62,"wcagAA":true,"wcagAAA":true},{"name":"White text","hex":"#FFFFFF","contrast":1.34,"wcagAA":false,"wcagAAA":false}]

Accessible alternatives

[{"name":"#B7FEAF","hex":"#B7FEAF","family":"green","bestTextColor":"#000000","contrastBlack":17.81,"contrastWhite":1.18,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"#B9FC54","hex":"#B9FC54","family":"green","bestTextColor":"#000000","contrastBlack":17.12,"contrastWhite":1.23,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"#63FF52","hex":"#63FF52","family":"green","bestTextColor":"#000000","contrastBlack":15.96,"contrastWhite":1.32,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"#54FC97","hex":"#54FC97","family":"green","bestTextColor":"#000000","contrastBlack":15.75,"contrastWhite":1.33,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"Light Green","hex":"#90EE90","family":"green","bestTextColor":"#000000","contrastBlack":14.82,"contrastWhite":1.42,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]}]

AI context

{"semanticGroups":["cool green","vibrant","vibrant green","Toxic Green 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/66fc55.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/toxic-green.json","https://www.colorsencyclopedia.com/api/colors/emerald.json","https://www.colorsencyclopedia.com/api/colors/paris-green.json"]}

Harmonies

{"complementary":"#EC54FC","analogous":["#B9FC54","#54FC97"],"triadic":["#5465FC","#FC5465"],"tetradic":["#54B9FC","#EC54FC","#FC9754"],"splitComplementary":["#9754FC","#FC54B9"],"monochromatic":["#B7FEAF","#66FC55","#1BF104"]}

Variants

{"light":"#B7FEAF","dark":"#1BF104","saturated":"#63FF52","desaturated":"#74E967","pastel":"#D9FBD5","neon":"#88FF7A"}

Nearest named colors

[{"slug":"toxic-green","name":"Toxic Green","hex":"#61DE2A","distance":52.66877632905477},{"slug":"emerald","name":"Emerald","hex":"#50C878","distance":66.4304147209695},{"slug":"paris-green","name":"Paris Green","hex":"#50C878","distance":66.4304147209695},{"slug":"light-green","name":"Light Green","hex":"#90EE90","distance":73.76313442364011},{"slug":"pistachio","name":"Pistachio","hex":"#93C572","distance":76.75285010994706}]

HEX meaning and use

About #66FC55

#66FC55 is classified as a cool green value with vibrant visual character. #66FC55 is visually closest to Toxic Green, a named green color with HEX #61DE2A.

The RGB channels are 102, 252, and 85, with green carrying the strongest channel weight. In HSL, the hue is 114deg 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 0.731, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 52.67, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text15.62:1AA Pass

White text1.34:1AA Fail

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

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

Accessibility-Safe Pairings and Alternatives

Use these pairings when #66FC55 needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#00000015.62:1 · AAA

White text#FFFFFF1.34:1 · Fail

Accessible Alternatives

#B7FEAF#000000 text · best 17.81:1#B7FEAF

#B9FC54#000000 text · best 17.12:1#B9FC54

#63FF52#000000 text · best 15.96:1#63FF52

#54FC97#000000 text · best 15.75:1#54FC97

Light Green#000000 text · best 14.82:1#90EE90

Generated Palette

#66FC55#66FC55

#EC54FC#EC54FC

#B9FC54#B9FC54

#54FC97#54FC97

#B7FEAF#B7FEAF

#1BF104#1BF104

Color Harmonies

#EC54FC#EC54FC

#B9FC54#B9FC54

#54FC97#54FC97

#5465FC#5465FC

#FC5465#FC5465

Variants

#B7FEAF#B7FEAF

#1BF104#1BF104

#63FF52#63FF52

#74E967#74E967

#D9FBD5#D9FBD5

#88FF7A#88FF7A

Nearest Named Colors

Toxic Green#61DE2A

Emerald#50C878

Paris Green#50C878

Light Green#90EE90

Pistachio#93C572

#66FC55

CSS

Machine-Readable HEX Data (JSON)

About #66FC55

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides