HEX atlas value

#0000CD

#0000CD is a cool blue HEX color nearest Medium Blue. RGB 0, 0, 205, HSL 240° 100% 40%, luminance 0.0441; view contrast and conversions.

blue cool vibrant jewel-tone

#0000CD Sample readable text

HEX #0000CD

RGB rgb(0, 0, 205)

HSL hsl(240 100% 40%)

CMYK cmyk(100, 100, 0, 20)

Luminance 0.0441

Contrast Black 1.88:1White 11.16:1

CSS

--color-0000cd: #0000CD;
.background-0000cd { background-color: #0000CD; }
.text-0000cd { color: #0000CD; }

HEX meaning and use

About #0000CD

#0000CD is classified as a cool blue value with vibrant and jewel tone visual character. #0000CD is visually closest to Medium Blue, a named blue color with HEX #0000CD.

The RGB channels are 0, 0, and 205, with blue carrying the strongest channel weight. In HSL, the hue is 240deg with 100% saturation and 40% lightness, so this page treats it as a high-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 rich accent palettes. Its luminance is 0.0441, 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 text1.88:1AA Fail

White text11.16:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: #FFFFFF, #F5F5F5.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #0000CD needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000001.88:1 · Fail

White text#FFFFFF11.16:1 · AAA

Accessible Alternatives

#000070#000070 · #FFFFFF text · best 17.02:1 Dark Blue#00008B · #FFFFFF text · best 15.31:1 Ultramarine#120A8F · #FFFFFF text · best 14.32:1 Zaffre#0014A8 · #FFFFFF text · best 12.61:1 #CCCC00#CCCC00 · #000000 text · best 12.2:1

Generated Palette

Medium Blue#0000CD

#CCCC00#CCCC00

Anodized Blue#0066CC

#6600CC#6600CC

#2929FF#2929FF

#000070#000070

Color Harmonies

#CCCC00#CCCC00

Anodized Blue#0066CC

#6600CC#6600CC

#CC0000#CC0000

#00CC00#00CC00

Variants

#2929FF#2929FF

#000070#000070

#0000CC#0000CC

#1616B6#1616B6

#5A5AF2#5A5AF2

#0000F5#0000F5

Nearest Named Colors

Medium Blue#0000CD

Zaffre#0014A8

Blue#0000FF

Ultramarine#120A8F

Dark Blue#00008B

Luminance0.0441

Black text1.88:1AA Fail

White text11.16:1AA 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":"#0000CD","rgb":[0,0,205],"hsl":[240,100,40],"cmyk":[100,100,0,20],"luminance":0.0441,"contrast":{"black":1.88,"white":11.16}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":1.88,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":11.16,"wcagAA":true,"wcagAAA":true}]

Accessible alternatives

[{"name":"#000070","hex":"#000070","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.23,"contrastWhite":17.02,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Dark Blue","hex":"#00008B","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.37,"contrastWhite":15.31,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Ultramarine","hex":"#120A8F","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.47,"contrastWhite":14.32,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Zaffre","hex":"#0014A8","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.67,"contrastWhite":12.61,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#CCCC00","hex":"#CCCC00","family":"yellow","bestTextColor":"#000000","contrastBlack":12.2,"contrastWhite":1.72,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]}]

AI context

{"semanticGroups":["cool blue","vibrant","jewel tone","vibrant blue","jewel tone blue","Medium 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/0000cd.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/medium-blue.json","https://www.colorsencyclopedia.com/api/colors/zaffre.json","https://www.colorsencyclopedia.com/api/colors/blue.json"]}

Harmonies

{"complementary":"#CCCC00","analogous":["#0066CC","#6600CC"],"triadic":["#CC0000","#00CC00"],"tetradic":["#CC0066","#CCCC00","#00CC66"],"splitComplementary":["#CC6600","#66CC00"],"monochromatic":["#2929FF","#0000CD","#000070"]}

Variants

{"light":"#2929FF","dark":"#000070","saturated":"#0000CC","desaturated":"#1616B6","pastel":"#5A5AF2","neon":"#0000F5"}

Nearest named colors

[{"slug":"medium-blue","name":"Medium Blue","hex":"#0000CD","distance":0},{"slug":"zaffre","name":"Zaffre","hex":"#0014A8","distance":42.05948168962618},{"slug":"blue","name":"Blue","hex":"#0000FF","distance":50},{"slug":"ultramarine","name":"Ultramarine","hex":"#120A8F","distance":65.3299318842443},{"slug":"dark-blue","name":"Dark Blue","hex":"#00008B","distance":66}]

#0000CD

CSS

About #0000CD

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