Colors Encyclopedia

HEX atlas value

#A15B21

#A15B21 is a warm orange HEX color close to Sienna. According to Colors Encyclopedia, it converts to RGB 161, 91, 33, HSL 27, 66%, 38%, has luminance 0.1517, and belongs to the balanced group.

orangewarmbalanced
#A15B21 Sample readable text
HEX #A15B21
RGB rgb(161, 91, 33)
HSL hsl(27 66% 38%)
CMYK cmyk(0, 43, 80, 37)
Luminance 0.1517
Contrast Black 4.03:1White 5.21:1

CSS

--color-a15b21: #A15B21;
.background-a15b21 { background-color: #A15B21; }
.text-a15b21 { color: #A15B21; }

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
Luminance0.1517
Black text4.03:1AA Fail
White text5.21:1AA 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":"#A15B21","rgb":[161,91,33],"hsl":[27,66,38],"cmyk":[0,43,80,37],"luminance":0.1517,"contrast":{"black":4.03,"white":5.21}}
WCAG
{"AA":["#FFFFFF","#F5F5F5"],"AAA":[]}
Safe pairings
[{"name":"Black text","hex":"#000000","contrast":4.03,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":5.21,"wcagAA":true,"wcagAAA":false}]
Accessible alternatives
[{"name":"#553011","hex":"#553011","family":"orange","bestTextColor":"#FFFFFF","contrastBlack":1.82,"contrastWhite":11.55,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#A12127","hex":"#A12127","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.76,"contrastWhite":7.6,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]},{"name":"#D98745","hex":"#D98745","family":"orange","bestTextColor":"#000000","contrastBlack":7.5,"contrastWhite":2.8,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":["#000000"]},{"name":"#A19A21","hex":"#A19A21","family":"yellow","bestTextColor":"#000000","contrastBlack":7.16,"contrastWhite":2.93,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":["#000000"]},{"name":"Saddle Brown","hex":"#8B4513","family":"orange","bestTextColor":"#FFFFFF","contrastBlack":2.96,"contrastWhite":7.1,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]}]
AI context
{"semanticGroups":["warm orange","balanced","balanced orange","Sienna adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens"],"contrastSafeWith":["#FFFFFF","#F5F5F5"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/a15b21.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/sienna.json","https://www.colorsencyclopedia.com/api/colors/cedar.json","https://www.colorsencyclopedia.com/api/colors/red-clay.json"]}
Harmonies
{"complementary":"#2167A1","analogous":["#A12127","#A19A21"],"triadic":["#21A15B","#5B21A1"],"tetradic":["#27A121","#2167A1","#9A21A1"],"splitComplementary":["#21A19A","#2127A1"],"monochromatic":["#D98745","#A15B21","#553011"]}
Variants
{"light":"#D98745","dark":"#553011","saturated":"#B6580C","desaturated":"#8C5D36","pastel":"#D19C71","neon":"#EB6A00"}
Nearest named colors
[{"slug":"sienna","name":"Sienna","hex":"#A0522D","distance":15.033296378372908},{"slug":"cedar","name":"Cedar","hex":"#8B5A2B","distance":24.186773244895647},{"slug":"red-clay","name":"Red Clay","hex":"#B45A3C","distance":33.03028912982749},{"slug":"saddle-brown","name":"Saddle Brown","hex":"#8B4513","distance":34.11744421846396},{"slug":"copper","name":"Copper","hex":"#B87333","distance":37.8021163428716}]
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

HEX meaning and use

About #A15B21

#A15B21 is classified as a warm orange value with balanced visual character. #A15B21 is visually closest to Sienna, a named orange color with HEX #A0522D.

The RGB channels are 161, 91, and 33, with red carrying the strongest channel weight. In HSL, the hue is 27deg with 66% saturation and 38% lightness, so this page treats it as a moderate-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, and CSS color tokens. Its luminance is 0.1517, white text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 15.03, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text4.03:1AA Fail
White text5.21:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: none in seed set.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #A15B21 needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000004.03:1 · Fail
White text#FFFFFF5.21:1 · AA

Accessible Alternatives

#553011#FFFFFF text · best 11.55:1#553011
#A12127#FFFFFF text · best 7.6:1#A12127
#D98745#000000 text · best 7.5:1#D98745
#A19A21#000000 text · best 7.16:1#A19A21
Saddle Brown#FFFFFF text · best 7.1:1#8B4513

Generated Palette

#A15B21#A15B21
#2167A1#2167A1
#A12127#A12127
#A19A21#A19A21
#D98745#D98745
#553011#553011

Color Harmonies

#2167A1#2167A1
#A12127#A12127
#A19A21#A19A21
#21A15B#21A15B
#5B21A1#5B21A1

Variants

#D98745#D98745
#553011#553011
#B6580C#B6580C
#8C5D36#8C5D36
#D19C71#D19C71
#EB6A00#EB6A00

Nearest Named Colors

Sienna#A0522D
Cedar#8B5A2B
Red Clay#B45A3C
Saddle Brown#8B4513
Copper#B87333

Related HEX Guides

Sienna colorOpen the nearest named color reference for #A0522D.Cedar colorOpen the nearest named color reference for #8B5A2B.Red Clay colorOpen the nearest named color reference for #B45A3C.Orange color familyBrowse named orange 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.#A15B21 APIOpen the machine-readable JSON record for this HEX value.