HEX atlas value

#00008B

#00008B is a cool blue HEX color nearest Dark Blue. RGB 0, 0, 139, HSL 240° 100% 27%, luminance 0.0186; view contrast and conversions.

blue cool jewel-tone

#00008B Sample readable text

HEX #00008B

RGB rgb(0, 0, 139)

HSL hsl(240 100% 27%)

CMYK cmyk(100, 100, 0, 45)

Luminance 0.0186

Contrast Black 1.37:1White 15.31:1

CSS

--color-00008b: #00008B;
.background-00008b { background-color: #00008B; }
.text-00008b { color: #00008B; }

HEX meaning and use

About #00008B

#00008B is classified as a cool blue value with jewel tone visual character. #00008B is visually closest to Dark Blue, a named blue color with HEX #00008B.

The RGB channels are 0, 0, and 139, with blue carrying the strongest channel weight. In HSL, the hue is 240deg with 100% saturation and 27% lightness, so this page treats it as a high-saturation, dark 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 0.0186, 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 text1.37:1AA Fail

White text15.31:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: #FFFFFF, #F5F5F5.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #00008B needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000001.37:1 · Fail

White text#FFFFFF15.31:1 · AAA

Accessible Alternatives

#00002E#00002E · #FFFFFF text · best 20.19:1 Navy Blue#000080 · #FFFFFF text · best 16.01:1 #00008A#00008A · #FFFFFF text · best 15.37:1 #0F0F7B#0F0F7B · #FFFFFF text · best 15.28:1 Ultramarine#120A8F · #FFFFFF text · best 14.32:1

Generated Palette

Dark Blue#00008B

#8A8A00#8A8A00

#00458A#00458A

#45008A#45008A

#0000E6#0000E6

#00002E#00002E

Color Harmonies

#8A8A00#8A8A00

#00458A#00458A

#45008A#45008A

#8A0000#8A0000

#008A00#008A00

Variants

#0000E6#0000E6

#00002E#00002E

#00008A#00008A

#0F0F7B#0F0F7B

#1D1DED#1D1DED

#0000B3#0000B3

Nearest Named Colors

Dark Blue#00008B

Navy#000080

Navy Blue#000080

Ultramarine#120A8F

Zaffre#0014A8

Luminance0.0186

Black text1.37:1AA Fail

White text15.31:1AA 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":"#00008B","rgb":[0,0,139],"hsl":[240,100,27],"cmyk":[100,100,0,45],"luminance":0.0186,"contrast":{"black":1.37,"white":15.31}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":1.37,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":15.31,"wcagAA":true,"wcagAAA":true}]

Accessible alternatives

[{"name":"#00002E","hex":"#00002E","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.04,"contrastWhite":20.19,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Navy Blue","hex":"#000080","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.31,"contrastWhite":16.01,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#00008A","hex":"#00008A","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.37,"contrastWhite":15.37,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#0F0F7B","hex":"#0F0F7B","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.37,"contrastWhite":15.28,"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"]}]

AI context

{"semanticGroups":["cool blue","jewel tone","jewel tone blue","Dark 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/00008b.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/dark-blue.json","https://www.colorsencyclopedia.com/api/colors/navy.json","https://www.colorsencyclopedia.com/api/colors/navy-blue.json"]}

Harmonies

{"complementary":"#8A8A00","analogous":["#00458A","#45008A"],"triadic":["#8A0000","#008A00"],"tetradic":["#8A0045","#8A8A00","#008A45"],"splitComplementary":["#8A4500","#458A00"],"monochromatic":["#0000E6","#00008B","#00002E"]}

Variants

{"light":"#0000E6","dark":"#00002E","saturated":"#00008A","desaturated":"#0F0F7B","pastel":"#1D1DED","neon":"#0000B3"}

Nearest named colors

[{"slug":"dark-blue","name":"Dark Blue","hex":"#00008B","distance":0},{"slug":"navy","name":"Navy","hex":"#000080","distance":11},{"slug":"navy-blue","name":"Navy Blue","hex":"#000080","distance":11},{"slug":"ultramarine","name":"Ultramarine","hex":"#120A8F","distance":20.97617696340303},{"slug":"zaffre","name":"Zaffre","hex":"#0014A8","distance":35.22782990761707}]

#00008B

CSS

About #00008B

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