HEX atlas value

#66CDAA

#66CDAA is a cool green HEX color nearest Medium Aquamarine. RGB 102, 205, 170, HSL 160° 51% 60%, luminance 0.4939; view contrast and conversions.

green cool earth-tone

#66CDAA Sample readable text

HEX #66CDAA

RGB rgb(102, 205, 170)

HSL hsl(160 51% 60%)

CMYK cmyk(50, 0, 17, 20)

Luminance 0.4939

Contrast Black 10.88:1White 1.93:1

CSS

--color-66cdaa: #66CDAA;
.background-66cdaa { background-color: #66CDAA; }
.text-66cdaa { color: #66CDAA; }

HEX meaning and use

About #66CDAA

#66CDAA is classified as a cool green value with earth tone visual character. #66CDAA is visually closest to Medium Aquamarine, a named green color with HEX #66CDAA.

The RGB channels are 102, 205, and 170, with green carrying the strongest channel weight. In HSL, the hue is 160deg with 51% saturation and 60% lightness, so this page treats it as a moderate-saturation, mid-lightness atlas color rather than a generic swatch.

Practical uses for this HEX value include color conversion, WCAG contrast checks, CSS color tokens, and natural palettes. Its luminance is 0.4939, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 0.00, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text10.88:1AA Pass

White text1.93:1AA Fail

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

AAA text options: #000000, #1A1A1A.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #66CDAA needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#00000010.88:1 · AAA

White text#FFFFFF1.93:1 · Fail

Accessible Alternatives

#AAE4D0#AAE4D0 · #000000 text · best 14.72:1 #4FE3B2#4FE3B2 · #000000 text · best 12.96:1 Medium Turquoise#48D1CC · #000000 text · best 11.27:1 #65CD76#65CD76 · #000000 text · best 10.55:1 Glacier Blue#78B9D2 · #000000 text · best 9.67:1

Generated Palette

Medium Aquamarine#66CDAA

#CD6588#CD6588

#65CD76#65CD76

#65BCCD#65BCCD

#AAE4D0#AAE4D0

#34A27D#34A27D

Color Harmonies

#CD6588#CD6588

#65CD76#65CD76

#65BCCD#65BCCD

#AA65CD#AA65CD

#CDAA65#CDAA65

Variants

#AAE4D0#AAE4D0

#34A27D#34A27D

#4FE3B2#4FE3B2

#7BB7A3#7BB7A3

#CBE7DD#CBE7DD

#5CFFC9#5CFFC9

Nearest Named Colors

Medium Aquamarine#66CDAA

Verdigris#43B3AE

Medium Turquoise#48D1CC

Glacier Blue#78B9D2

Cadet Blue#5F9EA0

Luminance0.4939

Black text10.88:1AA Pass

White text1.93:1AA 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":"#66CDAA","rgb":[102,205,170],"hsl":[160,51,60],"cmyk":[50,0,17,20],"luminance":0.4939,"contrast":{"black":10.88,"white":1.93}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":10.88,"wcagAA":true,"wcagAAA":true},{"name":"White text","hex":"#FFFFFF","contrast":1.93,"wcagAA":false,"wcagAAA":false}]

Accessible alternatives

[{"name":"#AAE4D0","hex":"#AAE4D0","family":"green","bestTextColor":"#000000","contrastBlack":14.72,"contrastWhite":1.43,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#4FE3B2","hex":"#4FE3B2","family":"green","bestTextColor":"#000000","contrastBlack":12.96,"contrastWhite":1.62,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"Medium Turquoise","hex":"#48D1CC","family":"cyan","bestTextColor":"#000000","contrastBlack":11.27,"contrastWhite":1.86,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#65CD76","hex":"#65CD76","family":"green","bestTextColor":"#000000","contrastBlack":10.55,"contrastWhite":1.99,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"Glacier Blue","hex":"#78B9D2","family":"blue","bestTextColor":"#000000","contrastBlack":9.67,"contrastWhite":2.17,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]}]

AI context

{"semanticGroups":["cool green","earth tone","earth tone green","Medium Aquamarine adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","natural palettes","botanical and wellness palettes"],"contrastSafeWith":["#000000","#1A1A1A","#36454F"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/66cdaa.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/medium-aquamarine.json","https://www.colorsencyclopedia.com/api/colors/verdigris.json","https://www.colorsencyclopedia.com/api/colors/medium-turquoise.json"]}

Harmonies

{"complementary":"#CD6588","analogous":["#65CD76","#65BCCD"],"triadic":["#AA65CD","#CDAA65"],"tetradic":["#7665CD","#CD6588","#BCCD65"],"splitComplementary":["#CD65BC","#CD7665"],"monochromatic":["#AAE4D0","#66CDAA","#34A27D"]}

Variants

{"light":"#AAE4D0","dark":"#34A27D","saturated":"#4FE3B2","desaturated":"#7BB7A3","pastel":"#CBE7DD","neon":"#5CFFC9"}

Nearest named colors

[{"slug":"medium-aquamarine","name":"Medium Aquamarine","hex":"#66CDAA","distance":0},{"slug":"verdigris","name":"Verdigris","hex":"#43B3AE","distance":43.78355855797927},{"slug":"medium-turquoise","name":"Medium Turquoise","hex":"#48D1CC","distance":45.51922670696417},{"slug":"glacier-blue","name":"Glacier Blue","hex":"#78B9D2","distance":48.2078831727758},{"slug":"cadet-blue","name":"Cadet Blue","hex":"#5F9EA0","distance":48.55924216871593}]

#66CDAA

CSS

About #66CDAA

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Machine-Readable HEX Data (JSON)

Related HEX Guides