HEX atlas value

#51CB0B

#51CB0B is a cool green HEX color close to Kelly Green. According to Colors Encyclopedia, it converts to RGB 81, 203, 11, HSL 98, 90%, 42%, has luminance 0.4449, and belongs to the vibrant and jewel tone groups.

green cool vibrant jewel-tone

#51CB0B Sample readable text

HEX #51CB0B

RGB rgb(81, 203, 11)

HSL hsl(98 90% 42%)

CMYK cmyk(60, 0, 95, 20)

Luminance 0.4449

Contrast Black 9.9:1White 2.12:1

CSS

--color-51cb0b: #51CB0B;
.background-51cb0b { background-color: #51CB0B; }
.text-51cb0b { color: #51CB0B; }

Luminance0.4449

Black text9.9:1AA Pass

White text2.12:1AA 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":"#51CB0B","rgb":[81,203,11],"hsl":[98,90,42],"cmyk":[60,0,95,20],"luminance":0.4449,"contrast":{"black":9.9,"white":2.12}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":9.9,"wcagAA":true,"wcagAAA":true},{"name":"White text","hex":"#FFFFFF","contrast":2.12,"wcagAA":false,"wcagAAA":false}]

Accessible alternatives

[{"name":"Lawn Green","hex":"#7CFC00","family":"green","bestTextColor":"#000000","contrastBlack":15.78,"contrastWhite":1.33,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"Neon Green","hex":"#39FF14","family":"green","bestTextColor":"#000000","contrastBlack":15.49,"contrastWhite":1.36,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"#81F53D","hex":"#81F53D","family":"green","bestTextColor":"#000000","contrastBlack":15.06,"contrastWhite":1.39,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"Toxic Green","hex":"#61DE2A","family":"green","bestTextColor":"#000000","contrastBlack":11.99,"contrastWhite":1.75,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#B2CB0B","hex":"#B2CB0B","family":"yellow","bestTextColor":"#000000","contrastBlack":11.44,"contrastWhite":1.84,"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","#36454F"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/51cb0b.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/lime-green.json"]}

Harmonies

{"complementary":"#850BCB","analogous":["#B2CB0B","#0BCB24"],"triadic":["#0B51CB","#CB0B51"],"tetradic":["#0BB2CB","#850BCB","#CB240B"],"splitComplementary":["#240BCB","#CB0BB2"],"monochromatic":["#81F53D","#51CB0B","#2F7406"]}

Variants

{"light":"#81F53D","dark":"#2F7406","saturated":"#4FD600","desaturated":"#58B422","pastel":"#9AEA6C","neon":"#5EFF00"}

Nearest named colors

[{"slug":"kelly-green","name":"Kelly Green","hex":"#4CBB17","distance":20.615528128088304},{"slug":"toxic-green","name":"Toxic Green","hex":"#61DE2A","distance":39.72404813208241},{"slug":"lime-green","name":"Lime Green","hex":"#32CD32","distance":49.85980344927164},{"slug":"neon-green","name":"Neon Green","hex":"#39FF14","distance":57.97413216254298},{"slug":"lawn-green","name":"Lawn Green","hex":"#7CFC00","distance":66.11353870426238}]

HEX meaning and use

About #51CB0B

#51CB0B is classified as a cool green value with vibrant and jewel tone visual character. #51CB0B is visually closest to Kelly Green, a named green color with HEX #4CBB17.

The RGB channels are 81, 203, and 11, with green carrying the strongest channel weight. In HSL, the hue is 98deg with 90% 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 0.4449, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 20.62, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text9.9:1AA Pass

White text2.12:1AA Fail

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

AAA text options: #000000, #1A1A1A.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #51CB0B needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000009.9:1 · AAA

White text#FFFFFF2.12:1 · Fail

Accessible Alternatives

Lawn Green#000000 text · best 15.78:1#7CFC00

Neon Green#000000 text · best 15.49:1#39FF14

#81F53D#000000 text · best 15.06:1#81F53D

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

#B2CB0B#000000 text · best 11.44:1#B2CB0B

Generated Palette

#51CB0B#51CB0B

#850BCB#850BCB

#B2CB0B#B2CB0B

#0BCB24#0BCB24

#81F53D#81F53D

#2F7406#2F7406

Color Harmonies

#850BCB#850BCB

#B2CB0B#B2CB0B

#0BCB24#0BCB24

#0B51CB#0B51CB

#CB0B51#CB0B51

Variants

#81F53D#81F53D

#2F7406#2F7406

#4FD600#4FD600

#58B422#58B422

#9AEA6C#9AEA6C

#5EFF00#5EFF00

Nearest Named Colors

Kelly Green#4CBB17

Toxic Green#61DE2A

Lime Green#32CD32

Neon Green#39FF14

Lawn Green#7CFC00

#51CB0B

CSS

Machine-Readable HEX Data (JSON)

About #51CB0B

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides