HEX atlas value

#0047AB

#0047AB is a cool blue HEX color nearest Cobalt Blue. RGB 0, 71, 171, HSL 215° 100% 34%, luminance 0.0745; view contrast and conversions.

blue cool jewel-tone

#0047AB Sample readable text

HEX #0047AB

RGB rgb(0, 71, 171)

HSL hsl(215 100% 34%)

CMYK cmyk(100, 58, 0, 33)

Luminance 0.0745

Contrast Black 2.49:1White 8.43:1

CSS

--color-0047ab: #0047AB;
.background-0047ab { background-color: #0047AB; }
.text-0047ab { color: #0047AB; }

HEX meaning and use

About #0047AB

#0047AB is classified as a cool blue value with jewel tone visual character. #0047AB is visually closest to Cobalt Blue, a named blue color with HEX #0047AB.

The RGB channels are 0, 71, and 171, with blue carrying the strongest channel weight. In HSL, the hue is 215deg with 100% saturation and 34% 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 0.0745, 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 text2.49:1AA Fail

White text8.43:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: #FFFFFF, #F5F5F5.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #0047AB needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000002.49:1 · Fail

White text#FFFFFF8.43:1 · AAA

Accessible Alternatives

#002252#002252 · #FFFFFF text · best 15.56:1 #0E00AD#0E00AD · #FFFFFF text · best 12.95:1 Smalt#003399 · #FFFFFF text · best 10.86:1 Egyptian Blue#1034A6 · #FFFFFF text · best 10.17:1 #134B9A#134B9A · #FFFFFF text · best 8.4:1

Generated Palette

Cobalt Blue#0047AB

#AD6500#AD6500

#009FAD#009FAD

#0E00AD#0E00AD

#0A70FF#0A70FF

#002252#002252

Color Harmonies

#AD6500#AD6500

#009FAD#009FAD

#0E00AD#0E00AD

#AD0048#AD0048

#48AD00#48AD00

Variants

#0A70FF#0A70FF

#002252#002252

#0048AD#0048AD

#134B9A#134B9A

#3E88EF#3E88EF

#0059D6#0059D6

Nearest Named Colors

Cobalt Blue#0047AB

Signal Blue#0057B8

Sapphire#0F52BA

Egyptian Blue#1034A6

Smalt#003399

Luminance0.0745

Black text2.49:1AA Fail

White text8.43:1AA 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":"#0047AB","rgb":[0,71,171],"hsl":[215,100,34],"cmyk":[100,58,0,33],"luminance":0.0745,"contrast":{"black":2.49,"white":8.43}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":2.49,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":8.43,"wcagAA":true,"wcagAAA":true}]

Accessible alternatives

[{"name":"#002252","hex":"#002252","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.35,"contrastWhite":15.56,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#0E00AD","hex":"#0E00AD","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.62,"contrastWhite":12.95,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Smalt","hex":"#003399","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.93,"contrastWhite":10.86,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Egyptian Blue","hex":"#1034A6","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":2.06,"contrastWhite":10.17,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#134B9A","hex":"#134B9A","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":2.5,"contrastWhite":8.4,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]}]

AI context

{"semanticGroups":["cool blue","jewel tone","jewel tone blue","Cobalt Blue adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","rich accent palettes","calm digital interfaces"],"contrastSafeWith":["#FFFFFF","#F5F5F5"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/0047ab.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/cobalt-blue.json","https://www.colorsencyclopedia.com/api/colors/signal-blue.json","https://www.colorsencyclopedia.com/api/colors/sapphire.json"]}

Harmonies

{"complementary":"#AD6500","analogous":["#009FAD","#0E00AD"],"triadic":["#AD0048","#48AD00"],"tetradic":["#AD009F","#AD6500","#00AD0E"],"splitComplementary":["#AD0E00","#9FAD00"],"monochromatic":["#0A70FF","#0047AB","#002252"]}

Variants

{"light":"#0A70FF","dark":"#002252","saturated":"#0048AD","desaturated":"#134B9A","pastel":"#3E88EF","neon":"#0059D6"}

Nearest named colors

[{"slug":"cobalt-blue","name":"Cobalt Blue","hex":"#0047AB","distance":0},{"slug":"signal-blue","name":"Signal Blue","hex":"#0057B8","distance":20.615528128088304},{"slug":"sapphire","name":"Sapphire","hex":"#0F52BA","distance":23.895606290697042},{"slug":"egyptian-blue","name":"Egyptian Blue","hex":"#1034A6","distance":25.337718918639855},{"slug":"smalt","name":"Smalt","hex":"#003399","distance":26.90724809414742}]

#0047AB

CSS

About #0047AB

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