HEX atlas value

#0066CC

#0066CC is a cool blue HEX color close to Anodized Blue. According to Colors Encyclopedia, it converts to RGB 0, 102, 204, HSL 210, 100%, 40%, has luminance 0.1386, and belongs to the vibrant and jewel tone groups.

blue cool vibrant jewel-tone

#0066CC Sample readable text

HEX #0066CC

RGB rgb(0, 102, 204)

HSL hsl(210 100% 40%)

CMYK cmyk(100, 50, 0, 20)

Luminance 0.1386

Contrast Black 3.77:1White 5.57:1

CSS

--color-0066cc: #0066CC;
.background-0066cc { background-color: #0066CC; }
.text-0066cc { color: #0066CC; }

Luminance0.1386

Black text3.77:1AA Fail

White text5.57:1AA 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":"#0066CC","rgb":[0,102,204],"hsl":[210,100,40],"cmyk":[100,50,0,20],"luminance":0.1386,"contrast":{"black":3.77,"white":5.57}}

WCAG

{"AA":["#FFFFFF","#F5F5F5"],"AAA":[]}

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":3.77,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":5.57,"wcagAA":true,"wcagAAA":false}]

Accessible alternatives

[{"name":"#003870","hex":"#003870","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.8,"contrastWhite":11.67,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#0000CC","hex":"#0000CC","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.87,"contrastWhite":11.22,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Robin Egg Blue","hex":"#00CCCC","family":"cyan","bestTextColor":"#000000","contrastBlack":10.51,"contrastWhite":2,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"Sapphire","hex":"#0F52BA","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":2.94,"contrastWhite":7.15,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]},{"name":"Signal Blue","hex":"#0057B8","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":3.06,"contrastWhite":6.87,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":[]}]

AI context

{"semanticGroups":["cool blue","vibrant","jewel tone","vibrant blue","jewel tone blue","Anodized Blue adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","rich accent palettes","high-energy accents","calm digital interfaces"],"contrastSafeWith":["#FFFFFF","#F5F5F5"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/0066cc.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/anodized-blue.json","https://www.colorsencyclopedia.com/api/colors/ocean-blue.json","https://www.colorsencyclopedia.com/api/colors/signal-blue.json"]}

Harmonies

{"complementary":"#CC6600","analogous":["#00CCCC","#0000CC"],"triadic":["#CC0066","#66CC00"],"tetradic":["#CC00CC","#CC6600","#00CC00"],"splitComplementary":["#CC0000","#CCCC00"],"monochromatic":["#2994FF","#0066CC","#003870"]}

Variants

{"light":"#2994FF","dark":"#003870","saturated":"#0066CC","desaturated":"#1666B6","pastel":"#5AA6F2","neon":"#007AF5"}

Nearest named colors

[{"slug":"anodized-blue","name":"Anodized Blue","hex":"#0066CC","distance":0},{"slug":"ocean-blue","name":"Ocean Blue","hex":"#0077BE","distance":22.02271554554524},{"slug":"signal-blue","name":"Signal Blue","hex":"#0057B8","distance":25},{"slug":"denim","name":"Denim","hex":"#1560BD","distance":26.49528259898354},{"slug":"sapphire","name":"Sapphire","hex":"#0F52BA","distance":30.805843601498726}]

HEX meaning and use

About #0066CC

#0066CC is classified as a cool blue value with vibrant and jewel tone visual character. #0066CC is visually closest to Anodized Blue, a named blue color with HEX #0066CC.

The RGB channels are 0, 102, and 204, with blue carrying the strongest channel weight. In HSL, the hue is 210deg with 100% saturation and 40% 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 rich accent palettes. Its luminance is 0.1386, white 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 text3.77:1AA Fail

White text5.57:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: none in seed set.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #0066CC needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000003.77:1 · Fail

White text#FFFFFF5.57:1 · AA

Accessible Alternatives

#003870#FFFFFF text · best 11.67:1#003870

#0000CC#FFFFFF text · best 11.22:1#0000CC

Robin Egg Blue#000000 text · best 10.51:1#00CCCC

Sapphire#FFFFFF text · best 7.15:1#0F52BA

Signal Blue#FFFFFF text · best 6.87:1#0057B8

Generated Palette

Anodized Blue#0066CC

#CC6600#CC6600

Robin Egg Blue#00CCCC

#0000CC#0000CC

#2994FF#2994FF

#003870#003870

Color Harmonies

#CC6600#CC6600

Robin Egg Blue#00CCCC

#0000CC#0000CC

#CC0066#CC0066

#66CC00#66CC00

Variants

#2994FF#2994FF

#003870#003870

Anodized Blue#0066CC

#1666B6#1666B6

#5AA6F2#5AA6F2

#007AF5#007AF5

Nearest Named Colors

Anodized Blue#0066CC

Ocean Blue#0077BE

Signal Blue#0057B8

Denim#1560BD

Sapphire#0F52BA

#0066CC

CSS

Machine-Readable HEX Data (JSON)

About #0066CC

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides