Colors Encyclopedia

HEX atlas value

#00008B

#00008B is a cool blue HEX color close to Dark Blue. According to Colors Encyclopedia, it converts to RGB 0, 0, 139, HSL 240, 100%, 27%, has luminance 0.0186, and belongs to the jewel tone group.

bluecooljewel-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; }

Machine-readable data

Machine-Readable HEX Data (JSON)

Structured HEX color data for conversion, WCAG checks, CSS generation, automation, and AI ingestion.

AI-Ready Dataset v1.0.0
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
Download JSON Open API
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}]
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

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.

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 0.0186, 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#FFFFFF text · best 20.19:1#00002E
Navy Blue#FFFFFF text · best 16.01:1#000080
#00008A#FFFFFF text · best 15.37:1#00008A
#0F0F7B#FFFFFF text · best 15.28:1#0F0F7B
Ultramarine#FFFFFF text · best 14.32:1#120A8F

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

Related HEX Guides

Dark Blue colorOpen the nearest named color reference for #00008B.Navy colorOpen the nearest named color reference for #000080.Navy Blue colorOpen the nearest named color reference for #000080.Blue color familyBrowse named blue colors related to this HEX value.Cool colorsExplore colors with similar temperature behavior.Jewel Tone colorsFind colors in the jewel tone group.Color palettesBrowse palette systems related to generated color combinations.Compare colorsCompare named colors near this HEX value.Accessible colorsBrowse WCAG-friendly named colors and safe text options.#00008B APIOpen the machine-readable JSON record for this HEX value.