HEX atlas value

#66B81E

#66B81E is a cool green HEX color close to Kelly Green. According to Colors Encyclopedia, it converts to RGB 102, 184, 30, HSL 92, 72%, 42%, has luminance 0.372, and belongs to the vibrant and jewel tone groups.

green cool vibrant jewel-tone

#66B81E Sample readable text

HEX #66B81E

RGB rgb(102, 184, 30)

HSL hsl(92 72% 42%)

CMYK cmyk(45, 0, 84, 28)

Luminance 0.372

Contrast Black 8.44:1White 2.49:1

CSS

--color-66b81e: #66B81E;
.background-66b81e { background-color: #66B81E; }
.text-66b81e { color: #66B81E; }

Luminance0.372

Black text8.44:1AA Pass

White text2.49:1AA 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":"#66B81E","rgb":[102,184,30],"hsl":[92,72,42],"cmyk":[45,0,84,28],"luminance":0.372,"contrast":{"black":8.44,"white":2.49}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":8.44,"wcagAA":true,"wcagAAA":true},{"name":"White text","hex":"#FFFFFF","contrast":2.49,"wcagAA":false,"wcagAAA":false}]

Accessible alternatives

[{"name":"#94E250","hex":"#94E250","family":"green","bestTextColor":"#000000","contrastBlack":13.25,"contrastWhite":1.58,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"Toxic Green","hex":"#61DE2A","family":"green","bestTextColor":"#000000","contrastBlack":11.99,"contrastWhite":1.75,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#64D006","hex":"#64D006","family":"green","bestTextColor":"#000000","contrastBlack":10.57,"contrastWhite":1.99,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"Lime Green","hex":"#32CD32","family":"green","bestTextColor":"#000000","contrastBlack":9.91,"contrastWhite":2.12,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#B3B81E","hex":"#B3B81E","family":"yellow","bestTextColor":"#000000","contrastBlack":9.79,"contrastWhite":2.14,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]}]

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/66b81e.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/kelly-green.json","https://www.colorsencyclopedia.com/api/colors/toxic-green.json","https://www.colorsencyclopedia.com/api/colors/olive-drab.json"]}

Harmonies

{"complementary":"#701EB8","analogous":["#B3B81E","#1EB823"],"triadic":["#1E66B8","#B81E66"],"tetradic":["#1EB3B8","#701EB8","#B8231E"],"splitComplementary":["#231EB8","#B81EB3"],"monochromatic":["#94E250","#66B81E","#3A6911"]}

Variants

{"light":"#94E250","dark":"#3A6911","saturated":"#64D006","desaturated":"#68A136","pastel":"#A8DB7B","neon":"#77FF00"}

Nearest named colors

[{"slug":"kelly-green","name":"Kelly Green","hex":"#4CBB17","distance":27.09243436828813},{"slug":"toxic-green","name":"Toxic Green","hex":"#61DE2A","distance":40.162171256046406},{"slug":"olive-drab","name":"Olive Drab","hex":"#6B8E23","distance":42.59107887809371},{"slug":"olive-leaf","name":"Olive Leaf","hex":"#6B8E23","distance":42.59107887809371},{"slug":"lime-green","name":"Lime Green","hex":"#32CD32","distance":59.53990258641679}]

HEX meaning and use

About #66B81E

#66B81E is classified as a cool green value with vibrant and jewel tone visual character. #66B81E is visually closest to Kelly Green, a named green color with HEX #4CBB17.

The RGB channels are 102, 184, and 30, with green carrying the strongest channel weight. In HSL, the hue is 92deg with 72% saturation and 42% 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 0.372, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 27.09, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text8.44:1AA Pass

White text2.49:1AA Fail

AA text options: #000000, #1A1A1A.

AAA text options: #000000, #1A1A1A.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #66B81E needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000008.44:1 · AAA

White text#FFFFFF2.49:1 · Fail

Accessible Alternatives

#94E250#000000 text · best 13.25:1#94E250

Toxic Green#000000 text · best 11.99:1#61DE2A

#64D006#000000 text · best 10.57:1#64D006

Lime Green#000000 text · best 9.91:1#32CD32

#B3B81E#000000 text · best 9.79:1#B3B81E

Generated Palette

#66B81E#66B81E

#701EB8#701EB8

#B3B81E#B3B81E

#1EB823#1EB823

#94E250#94E250

#3A6911#3A6911

Color Harmonies

#701EB8#701EB8

#B3B81E#B3B81E

#1EB823#1EB823

#1E66B8#1E66B8

#B81E66#B81E66

Variants

#94E250#94E250

#3A6911#3A6911

#64D006#64D006

#68A136#68A136

#A8DB7B#A8DB7B

#77FF00#77FF00

Nearest Named Colors

Kelly Green#4CBB17

Toxic Green#61DE2A

Olive Drab#6B8E23

Olive Leaf#6B8E23

Lime Green#32CD32

#66B81E

CSS

Machine-Readable HEX Data (JSON)

About #66B81E

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides