HEX atlas value

#21CA5F

#21CA5F is a cool green HEX color close to Medium Sea Green. According to Colors Encyclopedia, it converts to RGB 33, 202, 95, HSL 142, 72%, 46%, has luminance 0.4339, and belongs to the vibrant group.

green cool vibrant

#21CA5F Sample readable text

HEX #21CA5F

RGB rgb(33, 202, 95)

HSL hsl(142 72% 46%)

CMYK cmyk(84, 0, 53, 21)

Luminance 0.4339

Contrast Black 9.68:1White 2.17:1

CSS

--color-21ca5f: #21CA5F;
.background-21ca5f { background-color: #21CA5F; }
.text-21ca5f { color: #21CA5F; }

Luminance0.4339

Black text9.68:1AA Pass

White text2.17:1AA 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":"#21CA5F","rgb":[33,202,95],"hsl":[142,72,46],"cmyk":[84,0,53,21],"luminance":0.4339,"contrast":{"black":9.68,"white":2.17}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":9.68,"wcagAA":true,"wcagAAA":true},{"name":"White text","hex":"#FFFFFF","contrast":2.17,"wcagAA":false,"wcagAAA":false}]

Accessible alternatives

[{"name":"#61E592","hex":"#61E592","family":"green","bestTextColor":"#000000","contrastBlack":13.13,"contrastWhite":1.6,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#07E458","hex":"#07E458","family":"green","bestTextColor":"#000000","contrastBlack":12.25,"contrastWhite":1.71,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#21CAB3","hex":"#21CAB3","family":"cyan","bestTextColor":"#000000","contrastBlack":10.16,"contrastWhite":2.07,"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"]}]

AI context

{"semanticGroups":["cool green","vibrant","vibrant green","Medium Sea Green adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","high-energy accents","botanical and wellness palettes"],"contrastSafeWith":["#000000","#1A1A1A","#36454F"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/21ca5f.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/medium-sea-green.json","https://www.colorsencyclopedia.com/api/colors/lime-green.json","https://www.colorsencyclopedia.com/api/colors/jade.json"]}

Harmonies

{"complementary":"#CA218C","analogous":["#37CA21","#21CAB3"],"triadic":["#5F21CA","#CA5F21"],"tetradic":["#2137CA","#CA218C","#CAB321"],"splitComplementary":["#B321CA","#CA2137"],"monochromatic":["#61E592","#21CA5F","#147B3A"]}

Variants

{"light":"#61E592","dark":"#147B3A","saturated":"#07E458","desaturated":"#3BB066","pastel":"#8BDFAA","neon":"#14FF6A"}

Nearest named colors

[{"slug":"medium-sea-green","name":"Medium Sea Green","hex":"#3CB371","distance":39.774363602702685},{"slug":"lime-green","name":"Lime Green","hex":"#32CD32","distance":48.19751030914356},{"slug":"jade","name":"Jade","hex":"#00A86B","distance":48.877397639399746},{"slug":"emerald","name":"Emerald","hex":"#50C878","distance":53.27288240746881},{"slug":"paris-green","name":"Paris Green","hex":"#50C878","distance":53.27288240746881}]

HEX meaning and use

About #21CA5F

#21CA5F is classified as a cool green value with vibrant visual character. #21CA5F is visually closest to Medium Sea Green, a named green color with HEX #3CB371.

The RGB channels are 33, 202, and 95, with green carrying the strongest channel weight. In HSL, the hue is 142deg with 72% saturation and 46% 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 high-energy accents. Its luminance is 0.4339, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 39.77, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text9.68:1AA Pass

White text2.17:1AA Fail

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

AAA text options: #000000, #1A1A1A.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #21CA5F needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000009.68:1 · AAA

White text#FFFFFF2.17:1 · Fail

Accessible Alternatives

#61E592#000000 text · best 13.13:1#61E592

#07E458#000000 text · best 12.25:1#07E458

#21CAB3#000000 text · best 10.16:1#21CAB3

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

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

Generated Palette

#21CA5F#21CA5F

#CA218C#CA218C

#37CA21#37CA21

#21CAB3#21CAB3

#61E592#61E592

#147B3A#147B3A

Color Harmonies

#CA218C#CA218C

#37CA21#37CA21

#21CAB3#21CAB3

#5F21CA#5F21CA

#CA5F21#CA5F21

Variants

#61E592#61E592

#147B3A#147B3A

#07E458#07E458

#3BB066#3BB066

#8BDFAA#8BDFAA

#14FF6A#14FF6A

Nearest Named Colors

Medium Sea Green#3CB371

Lime Green#32CD32

Jade#00A86B

Emerald#50C878

Paris Green#50C878

#21CA5F

CSS

Machine-Readable HEX Data (JSON)

About #21CA5F

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides