#121c37

Color #121c37

A moderately saturated very dark blue.

Closest named color Charcoal #36454f · ΔE 22.59 Nearest Tailwind class slate-900 #0f172b · ΔE 3.2

Open in Palette generator Color wheel Color mixer Contrast checker Blindness simulator Gradient

Conversions

HEX

#121c37

RGB

rgb(18, 28, 55)

HSL

hsl(223.8, 50.7%, 14.3%)

HSV / HSB

hsv(223.8, 67.3%, 21.6%)

CMYK

cmyk(67.3%, 49.1%, 0%, 78.4%)

LAB

lab(10.81, 5.64, -19.02)

LCH

lch(10.81, 19.84, 286.52)

OKLCH

oklch(23.3%, 0.0542, 266.93)

HWB

hwb(223.8, 7.1%, 78.4%)

Harmony colors

Complementary

#372d12

Analogous

#122e37

#121c37

#1a1237

Triadic

#121c37

#37121c

#1c3712

Split-complementary

#121c37

#371a12

#2e3712

Tetradic

#121c37

#2d1237

#372d12

#1c3712

Square

#121c37

#37122e

#372d12

#12371a

Shades

Color #121c37 mixed toward black.

#0f172e

#0c1325

#090e1b

#060912

#030509

Tints

Color #121c37 mixed toward white.

#24386e

#3654a5

#5a78c9

#91a5db

#c8d2ed

Tones

Color #121c37 mixed toward gray.

#151d34

#181f31

#1b202e

#1e222b

#212328

Accessibility

Aa White text on this color

16.84:1

Aa Black text on this color

1.25:1

White text reads better on this background (16.84:1). That passes WCAG AAA (≥7:1) for normal-size text.

Under color vision deficiencies

Protanopia

#171732 · ΔE 3.9

Deuteranopia

#161531 · ΔE 4.5

Tritanopia

#132d2c · ΔE 19.9

Achromatopsia

#1d1d1d · ΔE 14.2

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

Code

CSS

background-color: #121c37;

Tailwind (arbitrary value)

bg-[#121c37]

Related colors

Royal Blue #4169e1

Cornflower Blue #6495ed

Light Steel Blue #b0c4de

Light Slate Gray #778899

Slate Gray #708090

Dodger Blue #1e90ff

Frequently asked questions

#121c37 (#121c37) is rgb(18, 28, 55) in RGB.

No, #121c37 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.

Try it → Accessibility

Contrast Checker

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

Try it → Generators

Palette Generator

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

Try it →

Build something with this color

Generate a full palette from #121c37, or check how it holds up for accessibility.

Generate a palette → Check contrast