HEX atlas value

#21A158

#21A158 is a cool green HEX color close to Sea Green. According to Colors Encyclopedia, it converts to RGB 33, 161, 88, HSL 146, 66%, 38%, has luminance 0.2652, and belongs to the jewel tone group.

green cool jewel-tone

#21A158 Sample readable text

HEX #21A158

RGB rgb(33, 161, 88)

HSL hsl(146 66% 38%)

CMYK cmyk(80, 0, 45, 37)

Luminance 0.2652

Contrast Black 6.3:1White 3.33:1

CSS

--color-21a158: #21A158;
.background-21a158 { background-color: #21A158; }
.text-21a158 { color: #21A158; }

Luminance0.2652

Black text6.3:1AA 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":"#21A158","rgb":[33,161,88],"hsl":[146,66,38],"cmyk":[80,0,45,37],"luminance":0.2652,"contrast":{"black":6.3,"white":3.33}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":6.3,"wcagAA":true,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":3.33,"wcagAA":false,"wcagAAA":false}]

Accessible alternatives

[{"name":"#45D985","hex":"#45D985","family":"green","bestTextColor":"#000000","contrastBlack":11.52,"contrastWhite":1.82,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#11552F","hex":"#11552F","family":"green","bestTextColor":"#FFFFFF","contrastBlack":2.36,"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":"#0CB656","hex":"#0CB656","family":"green","bestTextColor":"#000000","contrastBlack":7.84,"contrastWhite":2.68,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":["#000000"]},{"name":"#A12169","hex":"#A12169","family":"pink","bestTextColor":"#FFFFFF","contrastBlack":2.94,"contrastWhite":7.15,"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/21a158.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":"#A12169","analogous":["#29A121","#21A198"],"triadic":["#5821A1","#A15821"],"tetradic":["#2129A1","#A12169","#A19821"],"splitComplementary":["#9821A1","#A12129"],"monochromatic":["#45D985","#21A158","#11552F"]}

Variants

{"light":"#45D985","dark":"#11552F","saturated":"#0CB656","desaturated":"#368C5B","pastel":"#71D19A","neon":"#00EB66"}

Nearest named colors

[{"slug":"sea-green","name":"Sea Green","hex":"#2E8B57","distance":25.573423705088842},{"slug":"shamrock","name":"Shamrock","hex":"#009E60","distance":34.08812109811862},{"slug":"jade","name":"Jade","hex":"#00A86B","distance":38.71692136521188},{"slug":"medium-sea-green","name":"Medium Sea Green","hex":"#3CB371","distance":40.963398296528084},{"slug":"traffic-green","name":"Traffic Green","hex":"#008450","distance":44.654227123532216}]

HEX meaning and use

About #21A158

#21A158 is classified as a cool green value with jewel tone visual character. #21A158 is visually closest to Sea Green, a named green color with HEX #2E8B57.

The RGB channels are 33, 161, and 88, with green carrying the strongest channel weight. In HSL, the hue is 146deg 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 0.2652, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 25.57, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text6.3:1AA 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 #21A158 needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000006.3:1 · AA

White text#FFFFFF3.33:1 · Fail

Accessible Alternatives

#45D985#000000 text · best 11.52:1#45D985

#11552F#FFFFFF text · best 8.88:1#11552F

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

#0CB656#000000 text · best 7.84:1#0CB656

#A12169#FFFFFF text · best 7.15:1#A12169

Generated Palette

#21A158#21A158

#A12169#A12169

#29A121#29A121

#21A198#21A198

#45D985#45D985

#11552F#11552F

Color Harmonies

#A12169#A12169

#29A121#29A121

#21A198#21A198

#5821A1#5821A1

#A15821#A15821

Variants

#45D985#45D985

#11552F#11552F

#0CB656#0CB656

#368C5B#368C5B

#71D19A#71D19A

#00EB66#00EB66

Nearest Named Colors

Sea Green#2E8B57

Shamrock#009E60

Jade#00A86B

Medium Sea Green#3CB371

Traffic Green#008450

#21A158

CSS

Machine-Readable HEX Data (JSON)

About #21A158

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides