HEX atlas value

#66AC15

#66AC15 is a cool green HEX color close to Kelly Green. According to Colors Encyclopedia, it converts to RGB 102, 172, 21, HSL 88, 78%, 38%, has luminance 0.3238, and belongs to the vibrant and jewel tone groups.

green cool vibrant jewel-tone

#66AC15 Sample readable text

HEX #66AC15

RGB rgb(102, 172, 21)

HSL hsl(88 78% 38%)

CMYK cmyk(41, 0, 88, 33)

Luminance 0.3238

Contrast Black 7.48:1White 2.81:1

CSS

--color-66ac15: #66AC15;
.background-66ac15 { background-color: #66AC15; }
.text-66ac15 { color: #66AC15; }

Luminance0.3238

Black text7.48:1AA Pass

White text2.81:1AA 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":"#66AC15","rgb":[102,172,21],"hsl":[88,78,38],"cmyk":[41,0,88,33],"luminance":0.3238,"contrast":{"black":7.48,"white":2.81}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":7.48,"wcagAA":true,"wcagAAA":true},{"name":"White text","hex":"#FFFFFF","contrast":2.81,"wcagAA":false,"wcagAAA":false}]

Accessible alternatives

[{"name":"#95E637","hex":"#95E637","family":"green","bestTextColor":"#000000","contrastBlack":13.65,"contrastWhite":1.54,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#5C15AC","hex":"#5C15AC","family":"purple","bestTextColor":"#FFFFFF","contrastBlack":2.16,"contrastWhite":9.73,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#67C200","hex":"#67C200","family":"green","bestTextColor":"#000000","contrastBlack":9.29,"contrastWhite":2.26,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"Kelly Green","hex":"#4CBB17","family":"green","bestTextColor":"#000000","contrastBlack":8.43,"contrastWhite":2.49,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":["#000000"]},{"name":"#ACA715","hex":"#ACA715","family":"yellow","bestTextColor":"#000000","contrastBlack":8.29,"contrastWhite":2.53,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":["#000000"]}]

AI context

{"semanticGroups":["cool green","vibrant","jewel tone","vibrant green","jewel tone green","Kelly Green adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","rich accent palettes","high-energy accents","botanical and wellness palettes"],"contrastSafeWith":["#000000","#1A1A1A"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/66ac15.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/kelly-green.json","https://www.colorsencyclopedia.com/api/colors/olive-drab.json","https://www.colorsencyclopedia.com/api/colors/olive-leaf.json"]}

Harmonies

{"complementary":"#5C15AC","analogous":["#ACA715","#1AAC15"],"triadic":["#1566AC","#AC1566"],"tetradic":["#15ACA7","#5C15AC","#AC151A"],"splitComplementary":["#151AAC","#A715AC"],"monochromatic":["#95E637","#66AC15","#365B0B"]}

Variants

{"light":"#95E637","dark":"#365B0B","saturated":"#67C200","desaturated":"#65972B","pastel":"#A5DC65","neon":"#7DEB00"}

Nearest named colors

[{"slug":"kelly-green","name":"Kelly Green","hex":"#4CBB17","distance":30.083217912982647},{"slug":"olive-drab","name":"Olive Drab","hex":"#6B8E23","distance":33.481338085566414},{"slug":"olive-leaf","name":"Olive Leaf","hex":"#6B8E23","distance":33.481338085566414},{"slug":"avocado","name":"Avocado","hex":"#568203","distance":48.41487374764082},{"slug":"scheeles-green","name":"Scheele Green","hex":"#478800","distance":51.94227565288221}]

HEX meaning and use

About #66AC15

#66AC15 is classified as a cool green value with vibrant and jewel tone visual character. #66AC15 is visually closest to Kelly Green, a named green color with HEX #4CBB17.

The RGB channels are 102, 172, and 21, with green carrying the strongest channel weight. In HSL, the hue is 88deg with 78% saturation and 38% 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 rich accent palettes. Its luminance is 0.3238, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 30.08, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text7.48:1AA Pass

White text2.81:1AA Fail

AA text options: #000000, #1A1A1A.

AAA text options: #000000.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #66AC15 needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000007.48:1 · AAA

White text#FFFFFF2.81:1 · Fail

Accessible Alternatives

#95E637#000000 text · best 13.65:1#95E637

#5C15AC#FFFFFF text · best 9.73:1#5C15AC

#67C200#000000 text · best 9.29:1#67C200

Kelly Green#000000 text · best 8.43:1#4CBB17

#ACA715#000000 text · best 8.29:1#ACA715

Generated Palette

#66AC15#66AC15

#5C15AC#5C15AC

#ACA715#ACA715

#1AAC15#1AAC15

#95E637#95E637

#365B0B#365B0B

Color Harmonies

#5C15AC#5C15AC

#ACA715#ACA715

#1AAC15#1AAC15

#1566AC#1566AC

#AC1566#AC1566

Variants

#95E637#95E637

#365B0B#365B0B

#67C200#67C200

#65972B#65972B

#A5DC65#A5DC65

#7DEB00#7DEB00

Nearest Named Colors

Kelly Green#4CBB17

Olive Drab#6B8E23

Olive Leaf#6B8E23

Avocado#568203

Scheele Green#478800

#66AC15

CSS

Machine-Readable HEX Data (JSON)

About #66AC15

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides