Colors Encyclopedia

HEX atlas value

#A51009

#A51009 is a warm red HEX color close to Cranberry. According to Colors Encyclopedia, it converts to RGB 165, 16, 9, HSL 3, 90%, 34%, has luminance 0.0839, and belongs to the balanced group.

redwarmbalanced
#A51009 Sample readable text
HEX #A51009
RGB rgb(165, 16, 9)
HSL hsl(3 90% 34%)
CMYK cmyk(0, 90, 95, 35)
Luminance 0.0839
Contrast Black 2.68:1White 7.84:1

CSS

--color-a51009: #A51009;
.background-a51009 { background-color: #A51009; }
.text-a51009 { color: #A51009; }

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
Luminance0.0839
Black text2.68:1AA Fail
White text7.84:1AA 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":"#A51009","rgb":[165,16,9],"hsl":[3,90,34],"cmyk":[0,90,95,35],"luminance":0.0839,"contrast":{"black":2.68,"white":7.84}}
WCAG
{"AA":["#FFFFFF","#F5F5F5"],"AAA":["#FFFFFF","#F5F5F5"]}
Safe pairings
[{"name":"Black text","hex":"#000000","contrast":2.68,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":7.84,"wcagAA":true,"wcagAAA":true}]
Accessible alternatives
[{"name":"#4E0804","hex":"#4E0804","family":"red","bestTextColor":"#FFFFFF","contrastBlack":1.36,"contrastWhite":15.44,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Carmine","hex":"#960018","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.31,"contrastWhite":9.09,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Crimson Red","hex":"#990000","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.35,"contrastWhite":8.92,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#92221C","hex":"#92221C","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.47,"contrastWhite":8.51,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Cranberry","hex":"#9F000F","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.48,"contrastWhite":8.46,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]}]
AI context
{"semanticGroups":["warm red","balanced","balanced red","Cranberry adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","high-attention visual states"],"contrastSafeWith":["#FFFFFF","#F5F5F5"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/a51009.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/cranberry.json","https://www.colorsencyclopedia.com/api/colors/crimson-red.json","https://www.colorsencyclopedia.com/api/colors/ruby-red.json"]}
Harmonies
{"complementary":"#099DA5","analogous":["#A5094F","#A55F09"],"triadic":["#09A510","#1009A5"],"tetradic":["#4FA509","#099DA5","#5F09A5"],"splitComplementary":["#09A55F","#094FA5"],"monochromatic":["#F32116","#A51009","#4E0804"]}
Variants
{"light":"#F32116","dark":"#4E0804","saturated":"#AD0900","desaturated":"#92221C","pastel":"#E55048","neon":"#D60B00"}
Nearest named colors
[{"slug":"cranberry","name":"Cranberry","hex":"#9F000F","distance":18.110770276274835},{"slug":"crimson-red","name":"Crimson Red","hex":"#990000","distance":21.93171219946131},{"slug":"ruby-red","name":"Ruby Red","hex":"#9B111E","distance":23.280893453645632},{"slug":"pompeian-red","name":"Pompeian Red","hex":"#A42A04","distance":26.49528259898354},{"slug":"carmine","name":"Carmine","hex":"#960018","distance":26.570660511172846}]
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

HEX meaning and use

About #A51009

#A51009 is classified as a warm red value with balanced visual character. #A51009 is visually closest to Cranberry, a named red color with HEX #9F000F.

The RGB channels are 165, 16, and 9, with red carrying the strongest channel weight. In HSL, the hue is 3deg with 90% saturation and 34% 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-attention visual states. Its luminance is 0.0839, white text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 18.11, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text2.68:1AA Fail
White text7.84:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: #FFFFFF, #F5F5F5.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #A51009 needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000002.68:1 · Fail
White text#FFFFFF7.84:1 · AAA

Accessible Alternatives

#4E0804#FFFFFF text · best 15.44:1#4E0804
Carmine#FFFFFF text · best 9.09:1#960018
Crimson Red#FFFFFF text · best 8.92:1#990000
#92221C#FFFFFF text · best 8.51:1#92221C
Cranberry#FFFFFF text · best 8.46:1#9F000F

Generated Palette

#A51009#A51009
#099DA5#099DA5
#A5094F#A5094F
#A55F09#A55F09
#F32116#F32116
#4E0804#4E0804

Color Harmonies

#099DA5#099DA5
#A5094F#A5094F
#A55F09#A55F09
#09A510#09A510
#1009A5#1009A5

Variants

#F32116#F32116
#4E0804#4E0804
#AD0900#AD0900
#92221C#92221C
#E55048#E55048
#D60B00#D60B00

Nearest Named Colors

Cranberry#9F000F
Crimson Red#990000
Ruby Red#9B111E
Pompeian Red#A42A04
Carmine#960018

Related HEX Guides

Cranberry colorOpen the nearest named color reference for #9F000F.Crimson Red colorOpen the nearest named color reference for #990000.Ruby Red colorOpen the nearest named color reference for #9B111E.Red color familyBrowse named red colors related to this HEX value.Warm colorsExplore colors with similar temperature behavior.Balanced colorsFind colors in the balanced 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.#A51009 APIOpen the machine-readable JSON record for this HEX value.