HEX atlas value

#63BF18

#63BF18 is a cool green HEX color close to Kelly Green. According to Colors Encyclopedia, it converts to RGB 99, 191, 24, HSL 93, 78%, 42%, has luminance 0.3998, and belongs to the vibrant and jewel tone groups.

green cool vibrant jewel-tone

#63BF18 Sample readable text

HEX #63BF18

RGB rgb(99, 191, 24)

HSL hsl(93 78% 42%)

CMYK cmyk(48, 0, 87, 25)

Luminance 0.3998

Contrast Black 9:1White 2.33:1

CSS

--color-63bf18: #63BF18;
.background-63bf18 { background-color: #63BF18; }
.text-63bf18 { color: #63BF18; }

Luminance0.3998

Black text9:1AA Pass

White text2.33:1AA 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":"#63BF18","rgb":[99,191,24],"hsl":[93,78,42],"cmyk":[48,0,87,25],"luminance":0.3998,"contrast":{"black":9,"white":2.33}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":9,"wcagAA":true,"wcagAAA":true},{"name":"White text","hex":"#FFFFFF","contrast":2.33,"wcagAA":false,"wcagAAA":false}]

Accessible alternatives

[{"name":"#91E949","hex":"#91E949","family":"green","bestTextColor":"#000000","contrastBlack":13.96,"contrastWhite":1.5,"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":"#60D600","hex":"#60D600","family":"green","bestTextColor":"#000000","contrastBlack":11.12,"contrastWhite":1.89,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#B6BF18","hex":"#B6BF18","family":"yellow","bestTextColor":"#000000","contrastBlack":10.45,"contrastWhite":2.01,"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"]}]

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/63bf18.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":"#7318BF","analogous":["#B6BF18","#18BF20"],"triadic":["#1863BF","#BF1863"],"tetradic":["#18B6BF","#7318BF","#BF2018"],"splitComplementary":["#2018BF","#BF18B6"],"monochromatic":["#91E949","#63BF18","#386D0D"]}

Variants

{"light":"#91E949","dark":"#386D0D","saturated":"#60D600","desaturated":"#65A72F","pastel":"#A6E076","neon":"#73FF00"}

Nearest named colors

[{"slug":"kelly-green","name":"Kelly Green","hex":"#4CBB17","distance":23.366642891095847},{"slug":"toxic-green","name":"Toxic Green","hex":"#61DE2A","distance":35.90264614203248},{"slug":"olive-drab","name":"Olive Drab","hex":"#6B8E23","distance":50.85272854036448},{"slug":"olive-leaf","name":"Olive Leaf","hex":"#6B8E23","distance":50.85272854036448},{"slug":"lime-green","name":"Lime Green","hex":"#32CD32","distance":57.21013896155121}]

HEX meaning and use

About #63BF18

#63BF18 is classified as a cool green value with vibrant and jewel tone visual character. #63BF18 is visually closest to Kelly Green, a named green color with HEX #4CBB17.

The RGB channels are 99, 191, and 24, with green carrying the strongest channel weight. In HSL, the hue is 93deg with 78% 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 0.3998, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 23.37, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text9:1AA Pass

White text2.33:1AA Fail

AA text options: #000000, #1A1A1A.

AAA text options: #000000, #1A1A1A.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #63BF18 needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000009:1 · AAA

White text#FFFFFF2.33:1 · Fail

Accessible Alternatives

#91E949#000000 text · best 13.96:1#91E949

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

#60D600#000000 text · best 11.12:1#60D600

#B6BF18#000000 text · best 10.45:1#B6BF18

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

Generated Palette

#63BF18#63BF18

#7318BF#7318BF

#B6BF18#B6BF18

#18BF20#18BF20

#91E949#91E949

#386D0D#386D0D

Color Harmonies

#7318BF#7318BF

#B6BF18#B6BF18

#18BF20#18BF20

#1863BF#1863BF

#BF1863#BF1863

Variants

#91E949#91E949

#386D0D#386D0D

#60D600#60D600

#65A72F#65A72F

#A6E076#A6E076

#73FF00#73FF00

Nearest Named Colors

Kelly Green#4CBB17

Toxic Green#61DE2A

Olive Drab#6B8E23

Olive Leaf#6B8E23

Lime Green#32CD32

#63BF18

CSS

Machine-Readable HEX Data (JSON)

About #63BF18

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides