Colors Encyclopedia

HEX atlas value

#E33A1C

#E33A1C is a warm red HEX color close to Vermilion. According to Colors Encyclopedia, it converts to RGB 227, 58, 28, HSL 9, 78%, 50%, has luminance 0.1944, and belongs to the vibrant group.

redwarmvibrant
#E33A1C Sample readable text
HEX #E33A1C
RGB rgb(227, 58, 28)
HSL hsl(9 78% 50%)
CMYK cmyk(0, 74, 88, 11)
Luminance 0.1944
Contrast Black 4.89:1White 4.3:1

CSS

--color-e33a1c: #E33A1C;
.background-e33a1c { background-color: #E33A1C; }
.text-e33a1c { color: #E33A1C; }

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
Luminance0.1944
Black text4.89:1AA Pass
White text4.3:1AA Fail
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":"#E33A1C","rgb":[227,58,28],"hsl":[9,78,50],"cmyk":[0,74,88,11],"luminance":0.1944,"contrast":{"black":4.89,"white":4.3}}
WCAG
{"AA":["#000000"],"AAA":[]}
Safe pairings
[{"name":"Black text","hex":"#000000","contrast":4.89,"wcagAA":true,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":4.3,"wcagAA":false,"wcagAAA":false}]
Accessible alternatives
[{"name":"#1CC5E3","hex":"#1CC5E3","family":"cyan","bestTextColor":"#000000","contrastBlack":10.15,"contrastWhite":2.07,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#E39D1C","hex":"#E39D1C","family":"orange","bestTextColor":"#000000","contrastBlack":9.11,"contrastWhite":2.31,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#912512","hex":"#912512","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.48,"contrastWhite":8.47,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#ED816E","hex":"#ED816E","family":"red","bestTextColor":"#000000","contrastBlack":7.97,"contrastWhite":2.64,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":["#000000"]},{"name":"Fire Opal","hex":"#E95C20","family":"orange","bestTextColor":"#000000","contrastBlack":6.02,"contrastWhite":3.49,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":[]}]
AI context
{"semanticGroups":["warm red","vibrant","vibrant red","Vermilion adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","high-energy accents","high-attention visual states"],"contrastSafeWith":["#000000"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/e33a1c.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/vermilion.json","https://www.colorsencyclopedia.com/api/colors/cinnabar.json","https://www.colorsencyclopedia.com/api/colors/poppy-red.json"]}
Harmonies
{"complementary":"#1CC5E3","analogous":["#E31C62","#E39D1C"],"triadic":["#1CE33A","#3A1CE3"],"tetradic":["#62E31C","#1CC5E3","#9D1CE3"],"splitComplementary":["#1CE39D","#1C62E3"],"monochromatic":["#ED816E","#E33A1C","#912512"]}
Variants
{"light":"#ED816E","dark":"#912512","saturated":"#FF2600","desaturated":"#C74E38","pastel":"#E7A397","neon":"#FF4929"}
Nearest named colors
[{"slug":"vermilion","name":"Vermilion","hex":"#E34234","distance":25.298221281347036},{"slug":"cinnabar","name":"Cinnabar","hex":"#E44D2E","distance":26.19160170741759},{"slug":"poppy-red","name":"Poppy Red","hex":"#DC343B","distance":32.341923257592455},{"slug":"persian-red","name":"Persian Red","hex":"#CC3333","distance":33.27160951922825},{"slug":"fire-opal","name":"Fire Opal","hex":"#E95C20","distance":34.75629439396553}]
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

HEX meaning and use

About #E33A1C

#E33A1C is classified as a warm red value with vibrant visual character. #E33A1C is visually closest to Vermilion, a named red color with HEX #E34234.

The RGB channels are 227, 58, and 28, with red carrying the strongest channel weight. In HSL, the hue is 9deg with 78% 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 0.1944, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 25.30, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text4.89:1AA Pass
White text4.3:1AA Fail

AA text options: #000000.

AAA text options: none in seed set.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #E33A1C needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000004.89:1 · AA
White text#FFFFFF4.3:1 · Fail

Accessible Alternatives

#1CC5E3#000000 text · best 10.15:1#1CC5E3
#E39D1C#000000 text · best 9.11:1#E39D1C
#912512#FFFFFF text · best 8.47:1#912512
#ED816E#000000 text · best 7.97:1#ED816E
Fire Opal#000000 text · best 6.02:1#E95C20

Generated Palette

#E33A1C#E33A1C
#1CC5E3#1CC5E3
#E31C62#E31C62
#E39D1C#E39D1C
#ED816E#ED816E
#912512#912512

Color Harmonies

#1CC5E3#1CC5E3
#E31C62#E31C62
#E39D1C#E39D1C
#1CE33A#1CE33A
#3A1CE3#3A1CE3

Variants

#ED816E#ED816E
#912512#912512
#FF2600#FF2600
#C74E38#C74E38
#E7A397#E7A397
#FF4929#FF4929

Nearest Named Colors

Vermilion#E34234
Cinnabar#E44D2E
Poppy Red#DC343B
Persian Red#CC3333
Fire Opal#E95C20

Related HEX Guides

Vermilion colorOpen the nearest named color reference for #E34234.Cinnabar colorOpen the nearest named color reference for #E44D2E.Poppy Red colorOpen the nearest named color reference for #DC343B.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.#E33A1C APIOpen the machine-readable JSON record for this HEX value.