HEX atlas value

#51C259

#51C259 is a cool green HEX color close to Emerald. According to Colors Encyclopedia, it converts to RGB 81, 194, 89, HSL 124, 48%, 54%, has luminance 0.4105, and belongs to the earth tone group.

green cool earth-tone

#51C259 Sample readable text

HEX #51C259

RGB rgb(81, 194, 89)

HSL hsl(124 48% 54%)

CMYK cmyk(58, 0, 54, 24)

Luminance 0.4105

Contrast Black 9.21:1White 2.28:1

CSS

--color-51c259: #51C259;
.background-51c259 { background-color: #51C259; }
.text-51c259 { color: #51C259; }

Luminance0.4105

Black text9.21:1AA Pass

White text2.28:1AA 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":"#51C259","rgb":[81,194,89],"hsl":[124,48,54],"cmyk":[58,0,54,24],"luminance":0.4105,"contrast":{"black":9.21,"white":2.28}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":9.21,"wcagAA":true,"wcagAAA":true},{"name":"White text","hex":"#FFFFFF","contrast":2.28,"wcagAA":false,"wcagAAA":false}]

Accessible alternatives

[{"name":"#95DA9A","hex":"#95DA9A","family":"green","bestTextColor":"#000000","contrastBlack":12.77,"contrastWhite":1.64,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#38DC43","hex":"#38DC43","family":"green","bestTextColor":"#000000","contrastBlack":11.49,"contrastWhite":1.83,"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"]},{"name":"Paris Green","hex":"#50C878","family":"green","bestTextColor":"#000000","contrastBlack":9.87,"contrastWhite":2.13,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#82C251","hex":"#82C251","family":"green","bestTextColor":"#000000","contrastBlack":9.78,"contrastWhite":2.15,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]}]

AI context

{"semanticGroups":["cool green","earth tone","earth tone green","Emerald 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/51c259.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":"#C251BA","analogous":["#82C251","#51C291"],"triadic":["#5951C2","#C25951"],"tetradic":["#5182C2","#C251BA","#C29151"],"splitComplementary":["#9151C2","#C25182"],"monochromatic":["#95DA9A","#51C259","#308836"]}

Variants

{"light":"#95DA9A","dark":"#308836","saturated":"#38DC43","desaturated":"#6BA86F","pastel":"#B8DBBA","neon":"#3DFF4A"}

Nearest named colors

[{"slug":"emerald","name":"Emerald","hex":"#50C878","distance":31.591137997862628},{"slug":"paris-green","name":"Paris Green","hex":"#50C878","distance":31.591137997862628},{"slug":"medium-sea-green","name":"Medium Sea Green","hex":"#3CB371","distance":35.24202037341219},{"slug":"lime-green","name":"Lime Green","hex":"#32CD32","distance":51.01960407529639},{"slug":"epoxy-green","name":"Epoxy Green","hex":"#4E8A57","distance":56.1159513863928}]

HEX meaning and use

About #51C259

#51C259 is classified as a cool green value with earth tone visual character. #51C259 is visually closest to Emerald, a named green color with HEX #50C878.

The RGB channels are 81, 194, and 89, with green carrying the strongest channel weight. In HSL, the hue is 124deg with 48% saturation and 54% 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 0.4105, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 31.59, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text9.21:1AA Pass

White text2.28:1AA Fail

AA text options: #000000, #1A1A1A.

AAA text options: #000000, #1A1A1A.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #51C259 needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000009.21:1 · AAA

White text#FFFFFF2.28:1 · Fail

Accessible Alternatives

#95DA9A#000000 text · best 12.77:1#95DA9A

#38DC43#000000 text · best 11.49:1#38DC43

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

Paris Green#000000 text · best 9.87:1#50C878

#82C251#000000 text · best 9.78:1#82C251

Generated Palette

#51C259#51C259

#C251BA#C251BA

#82C251#82C251

#51C291#51C291

#95DA9A#95DA9A

#308836#308836

Color Harmonies

#C251BA#C251BA

#82C251#82C251

#51C291#51C291

#5951C2#5951C2

#C25951#C25951

Variants

#95DA9A#95DA9A

#308836#308836

#38DC43#38DC43

#6BA86F#6BA86F

#B8DBBA#B8DBBA

#3DFF4A#3DFF4A

Nearest Named Colors

Emerald#50C878

Paris Green#50C878

Medium Sea Green#3CB371

Lime Green#32CD32

Epoxy Green#4E8A57

#51C259

CSS

Machine-Readable HEX Data (JSON)

About #51C259

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides