HEX atlas value

#637A1F

#637A1F is a cool green HEX color close to Fern Frond. According to Colors Encyclopedia, it converts to RGB 99, 122, 31, HSL 75, 59%, 30%, has luminance 0.1667, and belongs to the earth tone and jewel tone groups.

green cool earth-tone jewel-tone

#637A1F Sample readable text

HEX #637A1F

RGB rgb(99, 122, 31)

HSL hsl(75 59% 30%)

CMYK cmyk(19, 0, 75, 52)

Luminance 0.1667

Contrast Black 4.33:1White 4.85:1

CSS

--color-637a1f: #637A1F;
.background-637a1f { background-color: #637A1F; }
.text-637a1f { color: #637A1F; }

Luminance0.1667

Black text4.33:1AA Fail

White text4.85:1AA Pass

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":"#637A1F","rgb":[99,122,31],"hsl":[75,59,30],"cmyk":[19,0,75,52],"luminance":0.1667,"contrast":{"black":4.33,"white":4.85}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":4.33,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":4.85,"wcagAA":true,"wcagAAA":false}]

Accessible alternatives

[{"name":"#28310D","hex":"#28310D","family":"green","bestTextColor":"#FFFFFF","contrastBlack":1.54,"contrastWhite":13.67,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#361F7A","hex":"#361F7A","family":"purple","bestTextColor":"#FFFFFF","contrastBlack":1.63,"contrastWhite":12.85,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#9FC332","hex":"#9FC332","family":"green","bestTextColor":"#000000","contrastBlack":10.33,"contrastWhite":2.03,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#5B6930","hex":"#5B6930","family":"green","bestTextColor":"#FFFFFF","contrastBlack":3.51,"contrastWhite":5.99,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":[]},{"name":"Dark Olive Green","hex":"#556B2F","family":"green","bestTextColor":"#FFFFFF","contrastBlack":3.53,"contrastWhite":5.95,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":[]}]

AI context

{"semanticGroups":["cool green","earth tone","jewel tone","earth tone green","jewel tone green","Fern Frond adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","natural palettes","rich accent palettes","botanical and wellness palettes"],"contrastSafeWith":["#FFFFFF"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/637a1f.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/fern-frond.json","https://www.colorsencyclopedia.com/api/colors/olive-drab.json","https://www.colorsencyclopedia.com/api/colors/olive-leaf.json"]}

Harmonies

{"complementary":"#361F7A","analogous":["#7A631F","#367A1F"],"triadic":["#1F637A","#7A1F63"],"tetradic":["#1F7A63","#361F7A","#7A1F36"],"splitComplementary":["#1F367A","#631F7A"],"monochromatic":["#9FC332","#637A1F","#28310D"]}

Variants

{"light":"#9FC332","dark":"#28310D","saturated":"#6B8A0F","desaturated":"#5B6930","pastel":"#A5BF5A","neon":"#91C200"}

Nearest named colors

[{"slug":"fern-frond","name":"Fern Frond","hex":"#657220","distance":8.306623862918075},{"slug":"olive-drab","name":"Olive Drab","hex":"#6B8E23","distance":21.908902300206645},{"slug":"olive-leaf","name":"Olive Leaf","hex":"#6B8E23","distance":21.908902300206645},{"slug":"dark-olive-green","name":"Dark Olive Green","hex":"#556B2F","distance":26.019223662515376},{"slug":"olive-green","name":"Olive Green","hex":"#708238","distance":29.29163703175362}]

HEX meaning and use

About #637A1F

#637A1F is classified as a cool green value with earth tone and jewel tone visual character. #637A1F is visually closest to Fern Frond, a named green color with HEX #657220.

The RGB channels are 99, 122, and 31, with green carrying the strongest channel weight. In HSL, the hue is 75deg with 59% saturation and 30% lightness, so this page treats it as a moderate-saturation, dark 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 0.1667, white text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 8.31, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text4.33:1AA Fail

White text4.85:1AA Pass

AA text options: #FFFFFF.

AAA text options: none in seed set.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #637A1F needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000004.33:1 · Fail

White text#FFFFFF4.85:1 · AA

Accessible Alternatives

#28310D#FFFFFF text · best 13.67:1#28310D

#361F7A#FFFFFF text · best 12.85:1#361F7A

#9FC332#000000 text · best 10.33:1#9FC332

#5B6930#FFFFFF text · best 5.99:1#5B6930

Dark Olive Green#FFFFFF text · best 5.95:1#556B2F

Generated Palette

#637A1F#637A1F

#361F7A#361F7A

#7A631F#7A631F

#367A1F#367A1F

#9FC332#9FC332

#28310D#28310D

Color Harmonies

#361F7A#361F7A

#7A631F#7A631F

#367A1F#367A1F

#1F637A#1F637A

#7A1F63#7A1F63

Variants

#9FC332#9FC332

#28310D#28310D

#6B8A0F#6B8A0F

#5B6930#5B6930

#A5BF5A#A5BF5A

#91C200#91C200

Nearest Named Colors

Fern Frond#657220

Olive Drab#6B8E23

Olive Leaf#6B8E23

Dark Olive Green#556B2F

Olive Green#708238

#637A1F

CSS

Machine-Readable HEX Data (JSON)

About #637A1F

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides