Colors Encyclopedia

HEX atlas value

#0000FF

#0000FF is a cool blue HEX color close to Blue. According to Colors Encyclopedia, it converts to RGB 0, 0, 255, HSL 240, 100%, 50%, has luminance 0.0722, and belongs to the vibrant group.

bluecoolvibrant
#0000FF Sample readable text
HEX #0000FF
RGB rgb(0, 0, 255)
HSL hsl(240 100% 50%)
CMYK cmyk(100, 100, 0, 0)
Luminance 0.0722
Contrast Black 2.44:1White 8.59:1

CSS

--color-0000ff: #0000FF;
.background-0000ff { background-color: #0000FF; }
.text-0000ff { color: #0000FF; }

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
Luminance0.0722
Black text2.44:1AA Fail
White text8.59:1AA 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":"#0000FF","rgb":[0,0,255],"hsl":[240,100,50],"cmyk":[100,100,0,0],"luminance":0.0722,"contrast":{"black":2.44,"white":8.59}}
WCAG
{"AA":["#FFFFFF","#F5F5F5"],"AAA":["#FFFFFF","#F5F5F5"]}
Safe pairings
[{"name":"Black text","hex":"#000000","contrast":2.44,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":8.59,"wcagAA":true,"wcagAAA":true}]
Accessible alternatives
[{"name":"Yellow","hex":"#FFFF00","family":"yellow","bestTextColor":"#000000","contrastBlack":19.56,"contrastWhite":1.07,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"#0000A3","hex":"#0000A3","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.53,"contrastWhite":13.74,"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":"Medium Blue","hex":"#0000CD","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.88,"contrastWhite":11.16,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#1C1CE3","hex":"#1C1CE3","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":2.32,"contrastWhite":9.04,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]}]
AI context
{"semanticGroups":["cool blue","vibrant","vibrant blue","Blue adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","high-energy accents","calm digital interfaces"],"contrastSafeWith":["#FFFFFF","#F5F5F5"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/0000ff.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/blue.json","https://www.colorsencyclopedia.com/api/colors/medium-blue.json","https://www.colorsencyclopedia.com/api/colors/han-purple.json"]}
Harmonies
{"complementary":"#FFFF00","analogous":["#007FFF","#7F00FF"],"triadic":["#FF0000","#00FF00"],"tetradic":["#FF0080","#FFFF00","#00FF80"],"splitComplementary":["#FF8000","#80FF00"],"monochromatic":["#5C5CFF","#0000FF","#0000A3"]}
Variants
{"light":"#5C5CFF","dark":"#0000A3","saturated":"#0000FF","desaturated":"#1C1CE3","pastel":"#8989F5","neon":"#2929FF"}
Nearest named colors
[{"slug":"blue","name":"Blue","hex":"#0000FF","distance":0},{"slug":"medium-blue","name":"Medium Blue","hex":"#0000CD","distance":50},{"slug":"han-purple","name":"Han Purple","hex":"#5218FA","distance":85.58621384311844},{"slug":"neon-blue","name":"Neon Blue","hex":"#1F51FF","distance":86.7294644281861},{"slug":"zaffre","name":"Zaffre","hex":"#0014A8","distance":89.26925562588724}]
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

HEX meaning and use

About #0000FF

#0000FF is classified as a cool blue value with vibrant visual character. #0000FF is visually closest to Blue, a named blue color with HEX #0000FF.

The RGB channels are 0, 0, and 255, with blue carrying the strongest channel weight. In HSL, the hue is 240deg with 100% saturation and 50% 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 high-energy accents. Its luminance is 0.0722, 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 text2.44:1AA Fail
White text8.59:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: #FFFFFF, #F5F5F5.

Accessibility-Safe Pairings and Alternatives

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

Black text#0000002.44:1 · Fail
White text#FFFFFF8.59:1 · AAA

Accessible Alternatives

Yellow#000000 text · best 19.56:1#FFFF00
#0000A3#FFFFFF text · best 13.74:1#0000A3
Zaffre#FFFFFF text · best 12.61:1#0014A8
Medium Blue#FFFFFF text · best 11.16:1#0000CD
#1C1CE3#FFFFFF text · best 9.04:1#1C1CE3

Generated Palette

Blue#0000FF
Yellow#FFFF00
#007FFF#007FFF
#7F00FF#7F00FF
#5C5CFF#5C5CFF
#0000A3#0000A3

Color Harmonies

Yellow#FFFF00
#007FFF#007FFF
#7F00FF#7F00FF
Red#FF0000
Lime#00FF00

Variants

#5C5CFF#5C5CFF
#0000A3#0000A3
Blue#0000FF
#1C1CE3#1C1CE3
#8989F5#8989F5
#2929FF#2929FF

Nearest Named Colors

Blue#0000FF
Medium Blue#0000CD
Han Purple#5218FA
Neon Blue#1F51FF
Zaffre#0014A8

Related HEX Guides

Blue colorOpen the nearest named color reference for #0000FF.Medium Blue colorOpen the nearest named color reference for #0000CD.Han Purple colorOpen the nearest named color reference for #5218FA.Blue color familyBrowse named blue colors related to this HEX value.Cool colorsExplore colors with similar temperature behavior.Vibrant colorsFind colors in the vibrant 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.#0000FF APIOpen the machine-readable JSON record for this HEX value.