#D23737 Color

#D23737 is rgb(210, 55, 55) in RGB, hsl(0, 63%, 52%) in HSL, and about cmyk(0%, 74%, 74%, 18%) in CMYK. It has no registered color name of its own — the closest is Persian Red (#CC3333), below the threshold most people can see at ΔE 1.8. White text is the more readable choice on this background.

#D23737

HEX#D23737

RGBrgb(210, 55, 55)

HSLhsl(0, 63%, 52%)

HSVhsv(0, 74%, 82%)

CMYKcmyk(0%, 74%, 74%, 18%)

OKLCHoklch(57.4% 0.192 25.7)

LABlab(48.65% 60.60 38.56)

LCHlch(48.65% 71.83 32.47)

What #D23737 Is Called

Most hex codes have no name: there are 16.7 million of them and a few thousand registered names. These are the named colors nearest to #D23737, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Persian Red#CC3333ΔE 1.8 Madder Lake#CC3336ΔE 2.35 International Orange (Golden Gate Bridge)#C0362CΔE 6.8 Fire Engine Red#CE2029ΔE 7.11 Alizarin#DB2D43ΔE 8.09 Rusty Red#DA2C43ΔE 8.32

Browse the full index of named colors A-Z or every red in the library.

#D23737 Channel Values

How #D23737 breaks down in each color model. Hue is measured in degrees around the color wheel; saturation, lightness, and the CMYK inks are percentages.

Model	Channels	Notes
RGB	R 210 · G 55 · B 55	8-bit channels as sent to the display
HSL	H 0° · S 63% · L 52%	Easiest model for building lighter and darker variants
HSV	H 0° · S 74% · V 82%	Matches the picker in most design tools
CMYK	C 0% · M 74% · Y 74% · K 18%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	4.84:1 vs white · 4.34:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #D23737 background. AA requires 4.5:1 for normal text and 3:1 for large text; AAA requires 7:1. Contrast is one check, not a full accessibility review.

TextWhite text4.84:1AA normal AA large AAA normal

Fails AABlack text4.34:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #D23737 in the contrast checker.

Colors That Go With #D23737

Pairings derived from color-wheel relationships. The complementary color sits opposite #D23737; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base

Complementary

Analogous

Analogous

Triadic

Triadic

Split comp.

Split comp.

Tints & Shades of #D23737

Lighter tints and darker shades built by moving the lightness channel while holding hue and saturation, which is what you want for hover states, backgrounds, and text variants.

Tints

Shades

Want a full 50-950 ramp with semantic roles? Generate design tokens from #D23737.

How #D23737 Looks with Color Vision Deficiency

Simulated with the Viénot, Brettel & Mollon LMS projection model. Anomalous types are rendered as partial versions of the matching dichromacy, which is an approximation rather than a per-person clinical model.

Typical#D23737

Protanopia#696935

Protanomaly#9E5936

Deuteranopia#868628

Deuteranomaly#AA6F2F

Tritanopia#D23737

Tritanomaly#D23737

Achromatopsia#727272

Test a full palette in the color blindness simulator.

Using #D23737 in Code

Copy-ready declarations for the places this color usually ends up.

CSS custom property--color-d23737: #D23737;

CSS backgroundbackground-color: #D23737;

Tailwind configcolors: { 'color-d23737': '#D23737' }

SwiftUIColor(red: 0.824, green: 0.216, blue: 0.216)

Android XML<color name="color_d23737">#D23737</color>

SVG fillfill="#D23737"

More Red Colors

#D23737 sits in the red family. These are its neighbours across that family's full range, each with its own breakdown.

1f0000 fffafa 1f0005 fff5f5 1f0008 fff1f2 240000 fff1f0 240909 fff0f2 270707 ffedeb 4e0707 710f04 940000 a81c07 c0362c cdacac e30022 ee204d fa8072 ff1818 ff6467 ffb7c5

#D23737 Frequently Asked Questions

What color is #D23737?

#D23737 is a mid-tone red — rgb(210, 55, 55) in RGB and hsl(0, 63%, 52%) in HSL. It carries no registered color name of its own; the closest named color is Persian Red (#CC3333), which is below the threshold most people can see at a CIE76 distance of 1.8.

What is the RGB value of #D23737?

#D23737 is rgb(210, 55, 55) — red 210, green 55, and blue 55 on the 0-255 scale.

What is the CMYK value of #D23737?

#D23737 converts to approximately cmyk(0%, 74%, 74%, 18%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #D23737 be black or white?

White text is the more readable choice. #D23737 scores 4.84:1 against white and 4.34:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #D23737 as a CSS color keyword?

No. #D23737 is not one of the CSS color keywords, so it has to be written as a hex, rgb() or hsl() value. The closest keyword is firebrick (#B22222) at a CIE76 distance of 9.71, which is clearly related but distinguishable side by side.

Open #D23737 in a Tool

Hex to RGB Hex to HSL Hex to CMYK Hex to OKLCH Hex to Pantone Build a palette Make a gradient

Keep exploring: every red in the color library, the guide to shades of red, or the full color library.