#181b21

Color #181b21

A muted very dark blue.

Closest named color Black #000000 · ΔE 10.74 Nearest Tailwind class zinc-900 #18181b · ΔE 2.5

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Conversions

HEX

#181b21

RGB

rgb(24, 27, 33)

HSL

hsl(220, 15.8%, 11.2%)

HSV / HSB

hsv(220, 27.3%, 12.9%)

CMYK

cmyk(27.3%, 18.2%, 0%, 87.1%)

LAB

lab(9.7, 0.32, -4.61)

LCH

lch(9.7, 4.62, 273.97)

OKLCH

oklch(22.2%, 0.0126, 264.06)

HWB

hwb(220, 9.4%, 87.1%)

Harmony colors

Complementary

#211e18

Analogous

#182021

#181b21

#1a1821

Triadic

#181b21

#21181b

#1b2118

Split-complementary

#181b21

#211a18

#202118

Tetradic

#181b21

#1e1821

#211e18

#1b2118

Square

#181b21

#211820

#211e18

#18211a

Shades

Color #181b21 mixed toward black.

#14171c

#101216

#0c0e11

#08090b

#040506

Tints

Color #181b21 mixed toward white.

#383f4d

#586378

#7c88a0

#a8b0bf

#d3d7df

Tones

Color #181b21 mixed toward gray.

#191b20

#1a1c20

#1a1c1f

#1b1c1e

#1c1c1d

Accessibility

Aa White text on this color

17.25:1

Aa Black text on this color

1.22:1

White text reads better on this background (17.25:1). That passes WCAG AAA (≥7:1) for normal-size text.

Under color vision deficiencies

Protanopia

#191920 · ΔE 2.4

Deuteranopia

#19191f · ΔE 2

Tritanopia

#181f1e · ΔE 6.4

Achromatopsia

#1b1b1b · ΔE 4.2

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

Code

CSS

background-color: #181b21;

Tailwind (arbitrary value)

bg-[#181b21]

Related colors

Cornflower Blue #6495ed

Royal Blue #4169e1

Light Steel Blue #b0c4de

Light Slate Gray #778899

Slate Gray #708090

Dodger Blue #1e90ff

Frequently asked questions

#181b21 (#181b21) is rgb(24, 27, 33) in RGB.

No, #181b21 is not web-safe. The nearest web-safe colors are among its tones and shades below.

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 #181b21, or check how it holds up for accessibility.

Generate a palette → Check contrast