Colors Encyclopedia

HEX atlas value

#A7371B

#A7371B is a warm red HEX color close to Brown. According to Colors Encyclopedia, it converts to RGB 167, 55, 27, HSL 12, 72%, 38%, has luminance 0.1103, and belongs to the vibrant group.

redwarmvibrant
#A7371B Sample readable text
HEX #A7371B
RGB rgb(167, 55, 27)
HSL hsl(12 72% 38%)
CMYK cmyk(0, 67, 84, 35)
Luminance 0.1103
Contrast Black 3.21:1White 6.55:1

CSS

--color-a7371b: #A7371B;
.background-a7371b { background-color: #A7371B; }
.text-a7371b { color: #A7371B; }

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
Luminance0.1103
Black text3.21:1AA Fail
White text6.55:1AA 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":"#A7371B","rgb":[167,55,27],"hsl":[12,72,38],"cmyk":[0,67,84,35],"luminance":0.1103,"contrast":{"black":3.21,"white":6.55}}
WCAG
{"AA":["#FFFFFF","#F5F5F5"],"AAA":[]}
Safe pairings
[{"name":"Black text","hex":"#000000","contrast":3.21,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":6.55,"wcagAA":true,"wcagAAA":false}]
Accessible alternatives
[{"name":"#581D0E","hex":"#581D0E","family":"red","bestTextColor":"#FFFFFF","contrastBlack":1.6,"contrastWhite":13.14,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Burnt Umber","hex":"#8A3324","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.58,"contrastWhite":8.14,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#A71B45","hex":"#A71B45","family":"pink","bestTextColor":"#FFFFFF","contrastBlack":2.89,"contrastWhite":7.28,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]},{"name":"Pompeian Red","hex":"#A42A04","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.91,"contrastWhite":7.21,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]},{"name":"Brown","hex":"#A52A2A","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.96,"contrastWhite":7.09,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]}]
AI context
{"semanticGroups":["warm red","vibrant","vibrant red","Brown adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","high-energy accents","high-attention visual states"],"contrastSafeWith":["#FFFFFF","#F5F5F5"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/a7371b.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/brown.json","https://www.colorsencyclopedia.com/api/colors/rust.json","https://www.colorsencyclopedia.com/api/colors/firebrick.json"]}
Harmonies
{"complementary":"#1B8BA7","analogous":["#A71B45","#A77D1B"],"triadic":["#1BA737","#371BA7"],"tetradic":["#45A71B","#1B8BA7","#7D1BA7"],"splitComplementary":["#1BA77D","#1B45A7"],"monochromatic":["#E05E3E","#A7371B","#581D0E"]}
Variants
{"light":"#E05E3E","dark":"#581D0E","saturated":"#BC2A06","desaturated":"#914430","pastel":"#D6806B","neon":"#EB2F00"}
Nearest named colors
[{"slug":"brown","name":"Brown","hex":"#A52A2A","distance":19.949937343260004},{"slug":"rust","name":"Rust","hex":"#B7410E","distance":22.9128784747792},{"slug":"firebrick","name":"Firebrick","hex":"#B22222","distance":24.71841418861655},{"slug":"pompeian-red","name":"Pompeian Red","hex":"#A42A04","distance":26.589471600616662},{"slug":"brick-red","name":"Brick Red","hex":"#8A3324","distance":30.62678566222711}]
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

HEX meaning and use

About #A7371B

#A7371B is classified as a warm red value with vibrant visual character. #A7371B is visually closest to Brown, a named red color with HEX #A52A2A.

The RGB channels are 167, 55, and 27, with red carrying the strongest channel weight. In HSL, the hue is 12deg with 72% saturation and 38% 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 0.1103, white text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 19.95, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text3.21:1AA Fail
White text6.55:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: none in seed set.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #A7371B needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000003.21:1 · Fail
White text#FFFFFF6.55:1 · AA

Accessible Alternatives

#581D0E#FFFFFF text · best 13.14:1#581D0E
Burnt Umber#FFFFFF text · best 8.14:1#8A3324
#A71B45#FFFFFF text · best 7.28:1#A71B45
Pompeian Red#FFFFFF text · best 7.21:1#A42A04
Brown#FFFFFF text · best 7.09:1#A52A2A

Generated Palette

#A7371B#A7371B
#1B8BA7#1B8BA7
#A71B45#A71B45
#A77D1B#A77D1B
#E05E3E#E05E3E
#581D0E#581D0E

Color Harmonies

#1B8BA7#1B8BA7
#A71B45#A71B45
#A77D1B#A77D1B
#1BA737#1BA737
#371BA7#371BA7

Variants

#E05E3E#E05E3E
#581D0E#581D0E
#BC2A06#BC2A06
#914430#914430
#D6806B#D6806B
#EB2F00#EB2F00

Nearest Named Colors

Brown#A52A2A
Rust#B7410E
Firebrick#B22222
Pompeian Red#A42A04
Brick Red#8A3324

Related HEX Guides

Brown colorOpen the nearest named color reference for #A52A2A.Rust colorOpen the nearest named color reference for #B7410E.Firebrick colorOpen the nearest named color reference for #B22222.Red color familyBrowse named red colors related to this HEX value.Warm 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.#A7371B APIOpen the machine-readable JSON record for this HEX value.