#403837

Color #403837

A nearly neutral, gray-leaning dark red.

Closest named color Charcoal #36454f · ΔE 12.53 Nearest Tailwind class taupe-700 #473c39 · ΔE 2.3

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Conversions

HEX

#403837

RGB

rgb(64, 56, 55)

HSL

hsl(6.7, 7.6%, 23.3%)

HSV / HSB

hsv(6.7, 14.1%, 25.1%)

CMYK

cmyk(0%, 12.5%, 14.1%, 74.9%)

LAB

lab(24.3, 3.3, 1.91)

LCH

lch(24.3, 3.81, 30.06)

OKLCH

oklch(34.9%, 0.0115, 26.34)

HWB

hwb(6.7, 21.6%, 74.9%)

Harmony colors

Complementary

#373f40

Analogous

#40373a

#403837

#403c37

Triadic

#403837

#374038

#383740

Split-complementary

#403837

#37403c

#373a40

Tetradic

#403837

#3f4037

#373f40

#383740

Square

#403837

#3a4037

#373f40

#3c3740

Shades

Color #403837 mixed toward black.

#352f2e

#2b2525

#201c1b

#151312

#0b0909

Tints

Color #403837 mixed toward white.

#635755

#867573

#a59796

#c3bab9

#e1dcdc

Tones

Color #403837 mixed toward gray.

#3f3838

#3e3938

#3e3a39

#3d3a3a

#3c3b3b

Accessibility

Aa White text on this color

11.42:1

Aa Black text on this color

1.84:1

White text reads better on this background (11.42:1). That passes WCAG AAA (≥7:1) for normal-size text.

Under color vision deficiencies

Protanopia

#3d3d37 · ΔE 6.9

Deuteranopia

#3d3e37 · ΔE 7.9

Tritanopia

#403737 · ΔE 1

Achromatopsia

#3a3a3a · ΔE 4.7

Left half is the original, right half is the simulated appearance. See all 8 vision types →

Code

CSS

background-color: #403837;

Tailwind (arbitrary value)

bg-[#403837]

Related colors

Salmon #fa8072

Misty Rose #ffe4e1

Tomato #ff6347

Red #ff0000

Maroon #800000

Black #000000

Frequently asked questions

#403837 (#403837) is rgb(64, 56, 55) in RGB.

No, #403837 is not one of the 216 web-safe colors — for that, every RGB channel would have to be a multiple of 51.

Related tools

Colors

HEX to RGB Converter

Convert any HEX color code to its RGB and HSL equivalents, live, with copy-to-clipboard values.

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Contrast Checker

Check the WCAG contrast ratio between any two colors, live, with AA/AAA pass-fail results.

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Palette Generator

Generate complementary, analogous, triadic, split-complementary, tetradic, square, and monochromatic palettes from any base color.

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Build something with this color

Generate a full palette from #403837, or check how it holds up for accessibility.

Generate a palette → Check contrast