HEX atlas value

#40E77B

#40E77B is a cool green HEX color close to Emerald. According to Colors Encyclopedia, it converts to RGB 64, 231, 123, HSL 141, 78%, 58%, has luminance 0.5967, and belongs to the vibrant group.

green cool vibrant

#40E77B Sample readable text

HEX #40E77B

RGB rgb(64, 231, 123)

HSL hsl(141 78% 58%)

CMYK cmyk(72, 0, 47, 9)

Luminance 0.5967

Contrast Black 12.93:1White 1.62:1

CSS

--color-40e77b: #40E77B;
.background-40e77b { background-color: #40E77B; }
.text-40e77b { color: #40E77B; }

Luminance0.5967

Black text12.93:1AA Pass

White text1.62:1AA 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":"#40E77B","rgb":[64,231,123],"hsl":[141,78,58],"cmyk":[72,0,47,9],"luminance":0.5967,"contrast":{"black":12.93,"white":1.62}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":12.93,"wcagAA":true,"wcagAAA":true},{"name":"White text","hex":"#FFFFFF","contrast":1.62,"wcagAA":false,"wcagAAA":false}]

Accessible alternatives

[{"name":"#29FF74","hex":"#29FF74","family":"green","bestTextColor":"#000000","contrastBlack":15.65,"contrastWhite":1.34,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"Spring Green","hex":"#00FF7F","family":"green","bestTextColor":"#000000","contrastBlack":15.61,"contrastWhite":1.35,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"#92F2B3","hex":"#92F2B3","family":"green","bestTextColor":"#000000","contrastBlack":15.57,"contrastWhite":1.35,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"#40E7CE","hex":"#40E7CE","family":"cyan","bestTextColor":"#000000","contrastBlack":13.54,"contrastWhite":1.55,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#59E740","hex":"#59E740","family":"green","bestTextColor":"#000000","contrastBlack":12.93,"contrastWhite":1.62,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]}]

AI context

{"semanticGroups":["cool green","vibrant","vibrant green","Emerald 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/40e77b.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/emerald.json","https://www.colorsencyclopedia.com/api/colors/paris-green.json","https://www.colorsencyclopedia.com/api/colors/medium-sea-green.json"]}

Harmonies

{"complementary":"#E740AD","analogous":["#59E740","#40E7CE"],"triadic":["#7B40E7","#E77B40"],"tetradic":["#4059E7","#E740AD","#E7CE40"],"splitComplementary":["#CE40E7","#E74059"],"monochromatic":["#92F2B3","#40E77B","#16B64E"]}

Variants

{"light":"#92F2B3","dark":"#16B64E","saturated":"#29FF74","desaturated":"#58D082","pastel":"#B8EFCB","neon":"#52FF8E"}

Nearest named colors

[{"slug":"emerald","name":"Emerald","hex":"#50C878","distance":35.014282800023196},{"slug":"paris-green","name":"Paris Green","hex":"#50C878","distance":35.014282800023196},{"slug":"medium-sea-green","name":"Medium Sea Green","hex":"#3CB371","distance":53.103672189407014},{"slug":"medium-aquamarine","name":"Medium Aquamarine","hex":"#66CDAA","distance":65.79513659838392},{"slug":"spring-green","name":"Spring Green","hex":"#00FF7F","distance":68.46897107449476}]

HEX meaning and use

About #40E77B

#40E77B is classified as a cool green value with vibrant visual character. #40E77B is visually closest to Emerald, a named green color with HEX #50C878.

The RGB channels are 64, 231, and 123, with green carrying the strongest channel weight. In HSL, the hue is 141deg with 78% saturation and 58% 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 0.5967, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 35.01, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text12.93:1AA Pass

White text1.62:1AA Fail

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

AAA text options: #000000, #1A1A1A.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #40E77B needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#00000012.93:1 · AAA

White text#FFFFFF1.62:1 · Fail

Accessible Alternatives

#29FF74#000000 text · best 15.65:1#29FF74

Spring Green#000000 text · best 15.61:1#00FF7F

#92F2B3#000000 text · best 15.57:1#92F2B3

#40E7CE#000000 text · best 13.54:1#40E7CE

#59E740#000000 text · best 12.93:1#59E740

Generated Palette

#40E77B#40E77B

#E740AD#E740AD

#59E740#59E740

#40E7CE#40E7CE

#92F2B3#92F2B3

#16B64E#16B64E

Color Harmonies

#E740AD#E740AD

#59E740#59E740

#40E7CE#40E7CE

#7B40E7#7B40E7

#E77B40#E77B40

Variants

#92F2B3#92F2B3

#16B64E#16B64E

#29FF74#29FF74

#58D082#58D082

#B8EFCB#B8EFCB

#52FF8E#52FF8E

Nearest Named Colors

Emerald#50C878

Paris Green#50C878

Medium Sea Green#3CB371

Medium Aquamarine#66CDAA

Spring Green#00FF7F

#40E77B

CSS

Machine-Readable HEX Data (JSON)

About #40E77B

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides