HEX atlas value

#66E605

#66E605 is a cool green HEX color close to Lawn Green. According to Colors Encyclopedia, it converts to RGB 102, 230, 5, HSL 94, 96%, 46%, has luminance 0.5943, and belongs to the vibrant group.

green cool vibrant

#66E605 Sample readable text

HEX #66E605

RGB rgb(102, 230, 5)

HSL hsl(94 96% 46%)

CMYK cmyk(56, 0, 98, 10)

Luminance 0.5943

Contrast Black 12.89:1White 1.63:1

CSS

--color-66e605: #66E605;
.background-66e605 { background-color: #66E605; }
.text-66e605 { color: #66E605; }

Luminance0.5943

Black text12.89:1AA Pass

White text1.63:1AA 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":"#66E605","rgb":[102,230,5],"hsl":[94,96,46],"cmyk":[56,0,98,10],"luminance":0.5943,"contrast":{"black":12.89,"white":1.63}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":12.89,"wcagAA":true,"wcagAAA":true},{"name":"White text","hex":"#FFFFFF","contrast":1.63,"wcagAA":false,"wcagAAA":false}]

Accessible alternatives

[{"name":"#97FB4B","hex":"#97FB4B","family":"green","bestTextColor":"#000000","contrastBlack":16.22,"contrastWhite":1.3,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"Chartreuse","hex":"#7FFF00","family":"green","bestTextColor":"#000000","contrastBlack":16.21,"contrastWhite":1.3,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"Lawn Green","hex":"#7CFC00","family":"green","bestTextColor":"#000000","contrastBlack":15.78,"contrastWhite":1.33,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"Neon Green","hex":"#39FF14","family":"green","bestTextColor":"#000000","contrastBlack":15.49,"contrastWhite":1.36,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"#D7E605","hex":"#D7E605","family":"yellow","bestTextColor":"#000000","contrastBlack":15.21,"contrastWhite":1.38,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]}]

AI context

{"semanticGroups":["cool green","vibrant","vibrant green","Lawn 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/66e605.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/lawn-green.json","https://www.colorsencyclopedia.com/api/colors/chartreuse.json","https://www.colorsencyclopedia.com/api/colors/toxic-green.json"]}

Harmonies

{"complementary":"#8405E6","analogous":["#D7E605","#05E614"],"triadic":["#0566E6","#E60566"],"tetradic":["#05D7E6","#8405E6","#E61405"],"splitComplementary":["#1405E6","#E605D7"],"monochromatic":["#97FB4B","#66E605","#3E8C03"]}

Variants

{"light":"#97FB4B","dark":"#3E8C03","saturated":"#66EB00","desaturated":"#6ACC1E","pastel":"#ADF179","neon":"#7AFF14"}

Nearest named colors

[{"slug":"lawn-green","name":"Lawn Green","hex":"#7CFC00","distance":31.51190251317746},{"slug":"chartreuse","name":"Chartreuse","hex":"#7FFF00","distance":35.70714214271425},{"slug":"toxic-green","name":"Toxic Green","hex":"#61DE2A","distance":38.18376618407357},{"slug":"kelly-green","name":"Kelly Green","hex":"#4CBB17","distance":53.376024580330075},{"slug":"neon-green","name":"Neon Green","hex":"#39FF14","distance":53.61902647381804}]

HEX meaning and use

About #66E605

#66E605 is classified as a cool green value with vibrant visual character. #66E605 is visually closest to Lawn Green, a named green color with HEX #7CFC00.

The RGB channels are 102, 230, and 5, with green carrying the strongest channel weight. In HSL, the hue is 94deg with 96% saturation and 46% 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 0.5943, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 31.51, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text12.89:1AA Pass

White text1.63:1AA Fail

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

AAA text options: #000000, #1A1A1A.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #66E605 needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#00000012.89:1 · AAA

White text#FFFFFF1.63:1 · Fail

Accessible Alternatives

#97FB4B#000000 text · best 16.22:1#97FB4B

Chartreuse#000000 text · best 16.21:1#7FFF00

Lawn Green#000000 text · best 15.78:1#7CFC00

Neon Green#000000 text · best 15.49:1#39FF14

#D7E605#000000 text · best 15.21:1#D7E605

Generated Palette

#66E605#66E605

#8405E6#8405E6

#D7E605#D7E605

#05E614#05E614

#97FB4B#97FB4B

#3E8C03#3E8C03

Color Harmonies

#8405E6#8405E6

#D7E605#D7E605

#05E614#05E614

#0566E6#0566E6

#E60566#E60566

Variants

#97FB4B#97FB4B

#3E8C03#3E8C03

#66EB00#66EB00

#6ACC1E#6ACC1E

#ADF179#ADF179

#7AFF14#7AFF14

Nearest Named Colors

Lawn Green#7CFC00

Chartreuse#7FFF00

Toxic Green#61DE2A

Kelly Green#4CBB17

Neon Green#39FF14

#66E605

CSS

Machine-Readable HEX Data (JSON)

About #66E605

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides