#1b2137

Color #1b2137

A muted very dark blue.

Closest named color Charcoal #36454f · ΔE 18.51 Nearest Tailwind class slate-900 #0f172b · ΔE 3.4

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

Conversions

HEX

#1b2137

RGB

rgb(27, 33, 55)

HSL

hsl(227.1, 34.1%, 16.1%)

HSV / HSB

hsv(227.1, 50.9%, 21.6%)

CMYK

cmyk(50.9%, 40%, 0%, 78.4%)

LAB

lab(13.21, 4.48, -15.19)

LCH

lch(13.21, 15.84, 286.43)

OKLCH

oklch(25.3%, 0.0426, 271.48)

HWB

hwb(227.1, 10.6%, 78.4%)

Harmony colors

Complementary

#37311b

Analogous

#1b2f37

#1b2137

#231b37

Triadic

#1b2137

#371b21

#21371b

Split-complementary

#1b2137

#37231b

#2f371b

Tetradic

#1b2137

#311b37

#37311b

#21371b

Square

#1b2137

#371b2f

#37311b

#1b3723

Shades

Color #1b2137 mixed toward black.

#171c2e

#121625

#0e111c

#090b12

#050609

Tints

Color #1b2137 mixed toward white.

#333e67

#4a5b97

#707fb9

#9faad0

#cfd4e8

Tones

Color #1b2137 mixed toward gray.

#1d2235

#202432

#222530

#24262e

#27282b

Accessibility

Aa White text on this color

15.92:1

Aa Black text on this color

1.32:1

White text reads better on this background (15.92:1). That passes WCAG AAA (≥7:1) for normal-size text.

Under color vision deficiencies

Protanopia

#1e1e33 · ΔE 2.7

Deuteranopia

#1d1d32 · ΔE 2.8

Tritanopia

#1b2f2e · ΔE 17.3

Achromatopsia

#222222 · ΔE 12.1

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

Code

CSS

background-color: #1b2137;

Tailwind (arbitrary value)

bg-[#1b2137]

Related colors

Royal Blue #4169e1

Cornflower Blue #6495ed

Navy #000080

Lavender #e6e6fa

Blue #0000ff

Dark Blue #00008b

Frequently asked questions

#1b2137 (#1b2137) is rgb(27, 33, 55) in RGB.

No, #1b2137 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 #1b2137, or check how it holds up for accessibility.

Generate a palette → Check contrast