HEX atlas value

#21A15B

#21A15B is a cool green HEX color close to Sea Green. According to Colors Encyclopedia, it converts to RGB 33, 161, 91, HSL 147, 66%, 38%, has luminance 0.2657, and belongs to the jewel tone group.

green cool jewel-tone

#21A15B Sample readable text

HEX #21A15B

RGB rgb(33, 161, 91)

HSL hsl(147 66% 38%)

CMYK cmyk(80, 0, 43, 37)

Luminance 0.2657

Contrast Black 6.31:1White 3.33:1

CSS

--color-21a15b: #21A15B;
.background-21a15b { background-color: #21A15B; }
.text-21a15b { color: #21A15B; }

Luminance0.2657

Black text6.31:1AA Pass

White text3.33:1AA 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":"#21A15B","rgb":[33,161,91],"hsl":[147,66,38],"cmyk":[80,0,43,37],"luminance":0.2657,"contrast":{"black":6.31,"white":3.33}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":6.31,"wcagAA":true,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":3.33,"wcagAA":false,"wcagAAA":false}]

Accessible alternatives

[{"name":"#45D987","hex":"#45D987","family":"green","bestTextColor":"#000000","contrastBlack":11.53,"contrastWhite":1.82,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#115530","hex":"#115530","family":"green","bestTextColor":"#FFFFFF","contrastBlack":2.37,"contrastWhite":8.88,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Medium Sea Green","hex":"#3CB371","family":"green","bestTextColor":"#000000","contrastBlack":7.88,"contrastWhite":2.67,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":["#000000"]},{"name":"#0CB658","hex":"#0CB658","family":"green","bestTextColor":"#000000","contrastBlack":7.85,"contrastWhite":2.68,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":["#000000"]},{"name":"#A12167","hex":"#A12167","family":"pink","bestTextColor":"#FFFFFF","contrastBlack":2.93,"contrastWhite":7.17,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]}]

AI context

{"semanticGroups":["cool green","jewel tone","jewel tone green","Sea Green adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","rich accent palettes","botanical and wellness palettes"],"contrastSafeWith":["#000000","#1A1A1A"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/21a15b.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/sea-green.json","https://www.colorsencyclopedia.com/api/colors/shamrock.json","https://www.colorsencyclopedia.com/api/colors/jade.json"]}

Harmonies

{"complementary":"#A12167","analogous":["#27A121","#21A19A"],"triadic":["#5B21A1","#A15B21"],"tetradic":["#2127A1","#A12167","#A19A21"],"splitComplementary":["#9A21A1","#A12127"],"monochromatic":["#45D987","#21A15B","#115530"]}

Variants

{"light":"#45D987","dark":"#115530","saturated":"#0CB658","desaturated":"#368C5D","pastel":"#71D19C","neon":"#00EB6A"}

Nearest named colors

[{"slug":"sea-green","name":"Sea Green","hex":"#2E8B57","distance":25.865034312755125},{"slug":"shamrock","name":"Shamrock","hex":"#009E60","distance":33.51119216023208},{"slug":"jade","name":"Jade","hex":"#00A86B","distance":37.33630940518894},{"slug":"medium-sea-green","name":"Medium Sea Green","hex":"#3CB371","distance":39.20459156782532},{"slug":"alexandrite","name":"Alexandrite","hex":"#3D8B74","distance":43.508619835614184}]

HEX meaning and use

About #21A15B

#21A15B is classified as a cool green value with jewel tone visual character. #21A15B is visually closest to Sea Green, a named green color with HEX #2E8B57.

The RGB channels are 33, 161, and 91, with green carrying the strongest channel weight. In HSL, the hue is 147deg with 66% saturation and 38% 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 rich accent palettes. Its luminance is 0.2657, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 25.87, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text6.31:1AA Pass

White text3.33:1AA Fail

AA text options: #000000, #1A1A1A.

AAA text options: none in seed set.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #21A15B needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000006.31:1 · AA

White text#FFFFFF3.33:1 · Fail

Accessible Alternatives

#45D987#000000 text · best 11.53:1#45D987

#115530#FFFFFF text · best 8.88:1#115530

Medium Sea Green#000000 text · best 7.88:1#3CB371

#0CB658#000000 text · best 7.85:1#0CB658

#A12167#FFFFFF text · best 7.17:1#A12167

Generated Palette

#21A15B#21A15B

#A12167#A12167

#27A121#27A121

#21A19A#21A19A

#45D987#45D987

#115530#115530

Color Harmonies

#A12167#A12167

#27A121#27A121

#21A19A#21A19A

#5B21A1#5B21A1

#A15B21#A15B21

Variants

#45D987#45D987

#115530#115530

#0CB658#0CB658

#368C5D#368C5D

#71D19C#71D19C

#00EB6A#00EB6A

Nearest Named Colors

Sea Green#2E8B57

Shamrock#009E60

Jade#00A86B

Medium Sea Green#3CB371

Alexandrite#3D8B74

#21A15B

CSS

Machine-Readable HEX Data (JSON)

About #21A15B

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides