#121b21

Color #121b21

A muted very dark blue.

Closest named color Black #000000 · ΔE 10.88 Nearest Tailwind class mist-900 #161b1d · ΔE 2.8

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Conversions

HEX

#121b21

RGB

rgb(18, 27, 33)

HSL

hsl(204, 29.4%, 10%)

HSV / HSB

hsv(204, 45.5%, 12.9%)

CMYK

cmyk(45.5%, 18.2%, 0%, 87.1%)

LAB

lab(9.18, -2.12, -5.45)

LCH

lch(9.18, 5.85, 248.74)

OKLCH

oklch(21.6%, 0.0177, 237.93)

HWB

hwb(204, 7.1%, 87.1%)

Harmony colors

Complementary

#211812

Analogous

#12211f

#121b21

#121421

Triadic

#121b21

#21121b

#1b2112

Split-complementary

#121b21

#211214

#211f12

Tetradic

#121b21

#181221

#211812

#1b2112

Square

#121b21

#1f1221

#211812

#142112

Shades

Color #121b21 mixed toward black.

#0f161b

#0c1216

#090d10

#06090b

#030405

Tints

Color #121b21 mixed toward white.

#2d4352

#486c84

#6b93ae

#9cb7c9

#cedbe4

Tones

Color #121b21 mixed toward gray.

#131b20

#151a1e

#161a1d

#171a1c

#181a1b

Accessibility

Aa White text on this color

17.44:1

Aa Black text on this color

1.2:1

White text reads better on this background (17.44:1). That passes WCAG AAA (≥7:1) for normal-size text.

Under color vision deficiencies

Protanopia

#161620 · ΔE 7.1

Deuteranopia

#16151f · ΔE 7.6

Tritanopia

#131f1e · ΔE 5.9

Achromatopsia

#1a1a1a · ΔE 5.5

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

Code

CSS

background-color: #121b21;

Tailwind (arbitrary value)

bg-[#121b21]

Related colors

Charcoal #36454f

Light Sky Blue #87cefa

Steel Blue #4682b4

Alice Blue #f0f8ff

Dodger Blue #1e90ff

Light Slate Gray #778899

Frequently asked questions

#121b21 (#121b21) is rgb(18, 27, 33) in RGB.

No, #121b21 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 #121b21, or check how it holds up for accessibility.

Generate a palette → Check contrast