Colors Encyclopedia

HEX atlas value

#E33D1C

#E33D1C is a warm red HEX color close to Cinnabar. According to Colors Encyclopedia, it converts to RGB 227, 61, 28, HSL 10, 78%, 50%, has luminance 0.1975, and belongs to the vibrant group.

redwarmvibrant
#E33D1C Sample readable text
HEX #E33D1C
RGB rgb(227, 61, 28)
HSL hsl(10 78% 50%)
CMYK cmyk(0, 73, 88, 11)
Luminance 0.1975
Contrast Black 4.95:1White 4.24:1

CSS

--color-e33d1c: #E33D1C;
.background-e33d1c { background-color: #E33D1C; }
.text-e33d1c { color: #E33D1C; }

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
Luminance0.1975
Black text4.95:1AA Pass
White text4.24:1AA 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":"#E33D1C","rgb":[227,61,28],"hsl":[10,78,50],"cmyk":[0,73,88,11],"luminance":0.1975,"contrast":{"black":4.95,"white":4.24}}
WCAG
{"AA":["#000000"],"AAA":[]}
Safe pairings
[{"name":"Black text","hex":"#000000","contrast":4.95,"wcagAA":true,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":4.24,"wcagAA":false,"wcagAAA":false}]
Accessible alternatives
[{"name":"#1CC2E3","hex":"#1CC2E3","family":"cyan","bestTextColor":"#000000","contrastBlack":9.88,"contrastWhite":2.13,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#E3A11C","hex":"#E3A11C","family":"orange","bestTextColor":"#000000","contrastBlack":9.38,"contrastWhite":2.24,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#912712","hex":"#912712","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.5,"contrastWhite":8.39,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#ED836E","hex":"#ED836E","family":"red","bestTextColor":"#000000","contrastBlack":8.07,"contrastWhite":2.6,"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","Cinnabar 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/e33d1c.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/cinnabar.json","https://www.colorsencyclopedia.com/api/colors/vermilion.json","https://www.colorsencyclopedia.com/api/colors/fire-opal.json"]}
Harmonies
{"complementary":"#1CC2E3","analogous":["#E31C5E","#E3A11C"],"triadic":["#1CE33D","#3D1CE3"],"tetradic":["#5EE31C","#1CC2E3","#A11CE3"],"splitComplementary":["#1CE3A1","#1C5EE3"],"monochromatic":["#ED836E","#E33D1C","#912712"]}
Variants
{"light":"#ED836E","dark":"#912712","saturated":"#FF2B00","desaturated":"#C75038","pastel":"#E7A497","neon":"#FF4C29"}
Nearest named colors
[{"slug":"cinnabar","name":"Cinnabar","hex":"#E44D2E","distance":24.1039415863879},{"slug":"vermilion","name":"Vermilion","hex":"#E34234","distance":24.515301344262525},{"slug":"fire-opal","name":"Fire Opal","hex":"#E95C20","distance":31.827660925679098},{"slug":"poppy-red","name":"Poppy Red","hex":"#DC343B","distance":33.03028912982749},{"slug":"persian-red","name":"Persian Red","hex":"#CC3333","distance":34.02939905434711}]
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

HEX meaning and use

About #E33D1C

#E33D1C is classified as a warm red value with vibrant visual character. #E33D1C is visually closest to Cinnabar, a named red color with HEX #E44D2E.

The RGB channels are 227, 61, and 28, with red carrying the strongest channel weight. In HSL, the hue is 10deg 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 0.1975, black text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 24.10, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text4.95:1AA Pass
White text4.24:1AA Fail

AA text options: #000000.

AAA text options: none in seed set.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #E33D1C needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000004.95:1 · AA
White text#FFFFFF4.24:1 · Fail

Accessible Alternatives

#1CC2E3#000000 text · best 9.88:1#1CC2E3
#E3A11C#000000 text · best 9.38:1#E3A11C
#912712#FFFFFF text · best 8.39:1#912712
#ED836E#000000 text · best 8.07:1#ED836E
Fire Opal#000000 text · best 6.02:1#E95C20

Generated Palette

#E33D1C#E33D1C
#1CC2E3#1CC2E3
#E31C5E#E31C5E
#E3A11C#E3A11C
#ED836E#ED836E
#912712#912712

Color Harmonies

#1CC2E3#1CC2E3
#E31C5E#E31C5E
#E3A11C#E3A11C
#1CE33D#1CE33D
#3D1CE3#3D1CE3

Variants

#ED836E#ED836E
#912712#912712
#FF2B00#FF2B00
#C75038#C75038
#E7A497#E7A497
#FF4C29#FF4C29

Nearest Named Colors

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

Related HEX Guides

Cinnabar colorOpen the nearest named color reference for #E44D2E.Vermilion colorOpen the nearest named color reference for #E34234.Fire Opal colorOpen the nearest named color reference for #E95C20.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.#E33D1C APIOpen the machine-readable JSON record for this HEX value.