HEX atlas value

#21901D

#21901D is a cool green HEX color close to Forest Green. According to Colors Encyclopedia, it converts to RGB 33, 144, 29, HSL 118, 66%, 34%, has luminance 0.2036, and belongs to the jewel tone group.

green cool jewel-tone

#21901D Sample readable text

HEX #21901D

RGB rgb(33, 144, 29)

HSL hsl(118 66% 34%)

CMYK cmyk(77, 0, 80, 44)

Luminance 0.2036

Contrast Black 5.07:1White 4.14:1

CSS

--color-21901d: #21901D;
.background-21901d { background-color: #21901D; }
.text-21901d { color: #21901D; }

Luminance0.2036

Black text5.07:1AA Pass

White text4.14:1AA 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":"#21901D","rgb":[33,144,29],"hsl":[118,66,34],"cmyk":[77,0,80,44],"luminance":0.2036,"contrast":{"black":5.07,"white":4.14}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":5.07,"wcagAA":true,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":4.14,"wcagAA":false,"wcagAAA":false}]

Accessible alternatives

[{"name":"#10440E","hex":"#10440E","family":"green","bestTextColor":"#FFFFFF","contrastBlack":1.86,"contrastWhite":11.31,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#39D534","hex":"#39D534","family":"green","bestTextColor":"#000000","contrastBlack":10.74,"contrastWhite":1.95,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#8C1D90","hex":"#8C1D90","family":"pink","bestTextColor":"#FFFFFF","contrastBlack":2.69,"contrastWhite":7.8,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Terre Verte","hex":"#385E0F","family":"green","bestTextColor":"#FFFFFF","contrastBlack":2.78,"contrastWhite":7.56,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]},{"name":"Emerald Dark","hex":"#046307","family":"green","bestTextColor":"#FFFFFF","contrastBlack":2.79,"contrastWhite":7.52,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]}]

AI context

{"semanticGroups":["cool green","jewel tone","jewel tone green","Forest Green adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","rich accent palettes","botanical and wellness palettes"],"contrastSafeWith":["#000000"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/21901d.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/forest-green.json","https://www.colorsencyclopedia.com/api/colors/green.json","https://www.colorsencyclopedia.com/api/colors/scheeles-green.json"]}

Harmonies

{"complementary":"#8C1D90","analogous":["#5B901D","#1D9053"],"triadic":["#1D2190","#901D21"],"tetradic":["#1D5B90","#8C1D90","#90531D"],"splitComplementary":["#531D90","#901D5B"],"monochromatic":["#39D534","#21901D","#10440E"]}

Variants

{"light":"#39D534","dark":"#10440E","saturated":"#0FA30A","desaturated":"#337D31","pastel":"#65CC61","neon":"#07D600"}

Nearest named colors

[{"slug":"forest-green","name":"Forest Green","hex":"#228B22","distance":7.14142842854285},{"slug":"green","name":"Green","hex":"#008000","distance":46.75467891024384},{"slug":"scheeles-green","name":"Scheele Green","hex":"#478800","distance":48.46648326421054},{"slug":"terre-verte","name":"Terre Verte","hex":"#385E0F","distance":56.789083458002736},{"slug":"emerald-dark","name":"Emerald Dark","hex":"#046307","distance":57.879184513951124}]

HEX meaning and use

About #21901D

#21901D is classified as a cool green value with jewel tone visual character. #21901D is visually closest to Forest Green, a named green color with HEX #228B22.

The RGB channels are 33, 144, and 29, with green carrying the strongest channel weight. In HSL, the hue is 118deg with 66% saturation and 34% 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 0.2036, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 7.14, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text5.07:1AA Pass

White text4.14:1AA Fail

AA text options: #000000.

AAA text options: none in seed set.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #21901D needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000005.07:1 · AA

White text#FFFFFF4.14:1 · Fail

Accessible Alternatives

#10440E#FFFFFF text · best 11.31:1#10440E

#39D534#000000 text · best 10.74:1#39D534

#8C1D90#FFFFFF text · best 7.8:1#8C1D90

Terre Verte#FFFFFF text · best 7.56:1#385E0F

Emerald Dark#FFFFFF text · best 7.52:1#046307

Generated Palette

#21901D#21901D

#8C1D90#8C1D90

#5B901D#5B901D

#1D9053#1D9053

#39D534#39D534

#10440E#10440E

Color Harmonies

#8C1D90#8C1D90

#5B901D#5B901D

#1D9053#1D9053

#1D2190#1D2190

#901D21#901D21

Variants

#39D534#39D534

#10440E#10440E

#0FA30A#0FA30A

#337D31#337D31

#65CC61#65CC61

#07D600#07D600

Nearest Named Colors

Forest Green#228B22

Green#008000

Scheele Green#478800

Terre Verte#385E0F

Emerald Dark#046307

#21901D

CSS

Machine-Readable HEX Data (JSON)

About #21901D

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides