Colors Encyclopedia

HEX atlas value

#66C43B

#66C43B is a cool green HEX color close to Toxic Green. According to Colors Encyclopedia, it converts to RGB 102, 196, 59, HSL 101, 54%, 50%, has luminance 0.4262, and belongs to the earth tone group.

greencoolearth-tone
#66C43B Sample readable text
HEX #66C43B
RGB rgb(102, 196, 59)
HSL hsl(101 54% 50%)
CMYK cmyk(48, 0, 70, 23)
Luminance 0.4262
Contrast Black 9.52:1White 2.2:1

CSS

--color-66c43b: #66C43B;
.background-66c43b { background-color: #66C43B; }
.text-66c43b { color: #66C43B; }

Machine-readable data

Machine-Readable HEX Data (JSON)

Structured HEX color data for conversion, WCAG checks, CSS generation, automation, and AI ingestion.

AI-Ready Dataset v1.0.0
Luminance0.4262
Black text9.52:1AA Pass
White text2.2:1AA 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
Download JSON Open API
Structured sections
Color systems
{"hex":"#66C43B","rgb":[102,196,59],"hsl":[101,54,50],"cmyk":[48,0,70,23],"luminance":0.4262,"contrast":{"black":9.52,"white":2.2}}
WCAG
{"AA":["#000000","#1A1A1A"],"AAA":["#000000","#1A1A1A"]}
Safe pairings
[{"name":"Black text","hex":"#000000","contrast":9.52,"wcagAA":true,"wcagAAA":true},{"name":"White text","hex":"#FFFFFF","contrast":2.2,"wcagAA":false,"wcagAAA":false}]
Accessible alternatives
[{"name":"#9DD981","hex":"#9DD981","family":"green","bestTextColor":"#000000","contrastBlack":12.68,"contrastWhite":1.66,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#5CE01F","hex":"#5CE01F","family":"green","bestTextColor":"#000000","contrastBlack":12.14,"contrastWhite":1.73,"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":"Yellow Green","hex":"#9ACD32","family":"green","bestTextColor":"#000000","contrastBlack":11.15,"contrastWhite":1.88,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#ABC43B","hex":"#ABC43B","family":"green","bestTextColor":"#000000","contrastBlack":10.69,"contrastWhite":1.96,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]}]
AI context
{"semanticGroups":["cool green","earth tone","earth tone green","Toxic Green adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","natural palettes","botanical and wellness palettes"],"contrastSafeWith":["#000000","#1A1A1A"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/66c43b.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/toxic-green.json","https://www.colorsencyclopedia.com/api/colors/kelly-green.json","https://www.colorsencyclopedia.com/api/colors/lime-green.json"]}
Harmonies
{"complementary":"#993BC4","analogous":["#ABC43B","#3BC454"],"triadic":["#3B66C4","#C43B66"],"tetradic":["#3BABC4","#993BC4","#C4543B"],"splitComplementary":["#543BC4","#C43BAB"],"monochromatic":["#9DD981","#66C43B","#417E26"]}
Variants
{"light":"#9DD981","dark":"#417E26","saturated":"#5CE01F","desaturated":"#71A857","pastel":"#B6D8A6","neon":"#6DFF29"}
Nearest named colors
[{"slug":"toxic-green","name":"Toxic Green","hex":"#61DE2A","distance":31.464265445104548},{"slug":"kelly-green","name":"Kelly Green","hex":"#4CBB17","distance":45.31004303683677},{"slug":"lime-green","name":"Lime Green","hex":"#32CD32","distance":53.53503525729669},{"slug":"yellow-green","name":"Yellow Green","hex":"#9ACD32","distance":53.53503525729669},{"slug":"olive-drab","name":"Olive Drab","hex":"#6B8E23","distance":59.30430001273095}]
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

HEX meaning and use

About #66C43B

#66C43B is classified as a cool green value with earth tone visual character. #66C43B is visually closest to Toxic Green, a named green color with HEX #61DE2A.

The RGB channels are 102, 196, and 59, with green carrying the strongest channel weight. In HSL, the hue is 101deg with 54% saturation and 50% lightness, so this page treats it as a moderate-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 natural palettes. Its luminance is 0.4262, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 31.46, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text9.52:1AA Pass
White text2.2:1AA Fail

AA text options: #000000, #1A1A1A.

AAA text options: #000000, #1A1A1A.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #66C43B needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000009.52:1 · AAA
White text#FFFFFF2.2:1 · Fail

Accessible Alternatives

#9DD981#000000 text · best 12.68:1#9DD981
#5CE01F#000000 text · best 12.14:1#5CE01F
Toxic Green#000000 text · best 11.99:1#61DE2A
Yellow Green#000000 text · best 11.15:1#9ACD32
#ABC43B#000000 text · best 10.69:1#ABC43B

Generated Palette

#66C43B#66C43B
#993BC4#993BC4
#ABC43B#ABC43B
#3BC454#3BC454
#9DD981#9DD981
#417E26#417E26

Color Harmonies

#993BC4#993BC4
#ABC43B#ABC43B
#3BC454#3BC454
#3B66C4#3B66C4
#C43B66#C43B66

Variants

#9DD981#9DD981
#417E26#417E26
#5CE01F#5CE01F
#71A857#71A857
#B6D8A6#B6D8A6
#6DFF29#6DFF29

Nearest Named Colors

Toxic Green#61DE2A
Kelly Green#4CBB17
Lime Green#32CD32
Yellow Green#9ACD32
Olive Drab#6B8E23

Related HEX Guides

Toxic Green colorOpen the nearest named color reference for #61DE2A.Kelly Green colorOpen the nearest named color reference for #4CBB17.Lime Green colorOpen the nearest named color reference for #32CD32.Green color familyBrowse named green colors related to this HEX value.Cool colorsExplore colors with similar temperature behavior.Earth Tone colorsFind colors in the earth tone group.Color palettesBrowse palette systems related to generated color combinations.Compare colorsCompare named colors near this HEX value.Accessible colorsBrowse WCAG-friendly named colors and safe text options.#66C43B APIOpen the machine-readable JSON record for this HEX value.