HEX atlas value

#4DEF91

#4DEF91 is a cool green HEX color close to Emerald. According to Colors Encyclopedia, it converts to RGB 77, 239, 145, HSL 145, 84%, 62%, has luminance 0.6536, and belongs to the vibrant group.

green cool vibrant

#4DEF91 Sample readable text

HEX #4DEF91

RGB rgb(77, 239, 145)

HSL hsl(145 84% 62%)

CMYK cmyk(68, 0, 39, 6)

Luminance 0.6536

Contrast Black 14.07:1White 1.49:1

CSS

--color-4def91: #4DEF91;
.background-4def91 { background-color: #4DEF91; }
.text-4def91 { color: #4DEF91; }

Luminance0.6536

Black text14.07:1AA Pass

White text1.49:1AA 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":"#4DEF91","rgb":[77,239,145],"hsl":[145,84,62],"cmyk":[68,0,39,6],"luminance":0.6536,"contrast":{"black":14.07,"white":1.49}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":14.07,"wcagAA":true,"wcagAAA":true},{"name":"White text","hex":"#FFFFFF","contrast":1.49,"wcagAA":false,"wcagAAA":false}]

Accessible alternatives

[{"name":"#A1F7C5","hex":"#A1F7C5","family":"green","bestTextColor":"#000000","contrastBlack":16.63,"contrastWhite":1.26,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"#3DFF8E","hex":"#3DFF8E","family":"green","bestTextColor":"#000000","contrastBlack":15.89,"contrastWhite":1.32,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"#4DEFE2","hex":"#4DEFE2","family":"cyan","bestTextColor":"#000000","contrastBlack":14.76,"contrastWhite":1.42,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#5AEF4D","hex":"#5AEF4D","family":"green","bestTextColor":"#000000","contrastBlack":13.89,"contrastWhite":1.51,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"Turquoise","hex":"#40E0D0","family":"cyan","bestTextColor":"#000000","contrastBlack":12.79,"contrastWhite":1.64,"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/4def91.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-aquamarine.json"]}

Harmonies

{"complementary":"#EF4DAC","analogous":["#5AEF4D","#4DEFE2"],"triadic":["#914DEF","#EF914D"],"tetradic":["#4D5AEF","#EF4DAC","#EFE24D"],"splitComplementary":["#E24DEF","#EF4D5A"],"monochromatic":["#A1F7C5","#4DEF91","#12CE60"]}

Variants

{"light":"#A1F7C5","dark":"#12CE60","saturated":"#3DFF8E","desaturated":"#62DA94","pastel":"#C7F5DA","neon":"#66FFA6"}

Nearest named colors

[{"slug":"emerald","name":"Emerald","hex":"#50C878","distance":46.42197755374064},{"slug":"paris-green","name":"Paris Green","hex":"#50C878","distance":46.42197755374064},{"slug":"medium-aquamarine","name":"Medium Aquamarine","hex":"#66CDAA","distance":49.05099387372289},{"slug":"turquoise","name":"Turquoise","hex":"#40E0D0","distance":66.05300901548695},{"slug":"medium-turquoise","name":"Medium Turquoise","hex":"#48D1CC","distance":66.37770710110436}]

HEX meaning and use

About #4DEF91

#4DEF91 is classified as a cool green value with vibrant visual character. #4DEF91 is visually closest to Emerald, a named green color with HEX #50C878.

The RGB channels are 77, 239, and 145, with green carrying the strongest channel weight. In HSL, the hue is 145deg with 84% saturation and 62% 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 0.6536, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 46.42, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text14.07:1AA Pass

White text1.49:1AA Fail

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

AAA text options: #000000, #1A1A1A.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #4DEF91 needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#00000014.07:1 · AAA

White text#FFFFFF1.49:1 · Fail

Accessible Alternatives

#A1F7C5#000000 text · best 16.63:1#A1F7C5

#3DFF8E#000000 text · best 15.89:1#3DFF8E

#4DEFE2#000000 text · best 14.76:1#4DEFE2

#5AEF4D#000000 text · best 13.89:1#5AEF4D

Turquoise#000000 text · best 12.79:1#40E0D0

Generated Palette

#4DEF91#4DEF91

#EF4DAC#EF4DAC

#5AEF4D#5AEF4D

#4DEFE2#4DEFE2

#A1F7C5#A1F7C5

#12CE60#12CE60

Color Harmonies

#EF4DAC#EF4DAC

#5AEF4D#5AEF4D

#4DEFE2#4DEFE2

#914DEF#914DEF

#EF914D#EF914D

Variants

#A1F7C5#A1F7C5

#12CE60#12CE60

#3DFF8E#3DFF8E

#62DA94#62DA94

#C7F5DA#C7F5DA

#66FFA6#66FFA6

Nearest Named Colors

Emerald#50C878

Paris Green#50C878

Medium Aquamarine#66CDAA

Turquoise#40E0D0

Medium Turquoise#48D1CC

#4DEF91

CSS

Machine-Readable HEX Data (JSON)

About #4DEF91

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides