#183a3f

Color #183a3f

A moderately saturated very dark cyan.

Closest named color Dark Slate Gray #2f4f4f · ΔE 9.63 Nearest Tailwind class teal-950 #022f2e · ΔE 5.9

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

Conversions

HEX

#183a3f

RGB

rgb(24, 58, 63)

HSL

hsl(187.7, 44.8%, 17.1%)

HSV / HSB

hsv(187.7, 61.9%, 24.7%)

CMYK

cmyk(61.9%, 7.9%, 0%, 75.3%)

LAB

lab(22.23, -10.6, -6.86)

LCH

lch(22.23, 12.63, 212.91)

OKLCH

oklch(32.6%, 0.0403, 208.16)

HWB

hwb(187.7, 9.4%, 75.3%)

Harmony colors

Complementary

#3f1d18

Analogous

#183f31

#183a3f

#18273f

Triadic

#183a3f

#3f183a

#3a3f18

Split-complementary

#183a3f

#3f1827

#3f3118

Tetradic

#183a3f

#1d183f

#3f1d18

#3a3f18

Square

#183a3f

#31183f

#3f1d18

#273f18

Shades

Color #183a3f mixed toward black.

#143035

#10272a

#0c1d20

#081315

#040a0b

Tints

Color #183a3f mixed toward white.

#2c6972

#3f98a5

#66b9c5

#99d0d8

#cce8ec

Tones

Color #183a3f mixed toward gray.

#1b383c

#1f3539

#223335

#253032

#282e2f

Accessibility

Aa White text on this color

12.24:1

Aa Black text on this color

1.72:1

White text reads better on this background (12.24:1). That passes WCAG AAA (≥7:1) for normal-size text.

Under color vision deficiencies

Protanopia

#2a2b3e · ΔE 17.9

Deuteranopia

#28263e · ΔE 20.8

Tritanopia

#1b3d3d · ΔE 3.1

Achromatopsia

#353535 · ΔE 12.4

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

Code

CSS

background-color: #183a3f;

Tailwind (arbitrary value)

bg-[#183a3f]

Related colors

Powder Blue #b0e0e6

Cadet Blue #5f9ea0

Dark Turquoise #00ced1

Light Blue #add8e6

Deep Sky Blue #00bfff

Aqua #00ffff

Frequently asked questions

#183a3f (#183a3f) is rgb(24, 58, 63) in RGB.

No, #183a3f 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 #183a3f, or check how it holds up for accessibility.

Generate a palette → Check contrast