#1b3f79

Color #1b3f79

A moderately saturated dark blue.

Closest named color Dark Slate Blue #483d8b · ΔE 17.98 Nearest Tailwind class blue-900 #1c398e · ΔE 4.6

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

Conversions

HEX

#1b3f79

RGB

rgb(27, 63, 121)

HSL

hsl(217, 63.5%, 29%)

HSV / HSB

hsv(217, 77.7%, 47.5%)

CMYK

cmyk(77.7%, 47.9%, 0%, 52.5%)

LAB

lab(27.21, 9.24, -36.84)

LCH

lch(27.21, 37.98, 284.08)

OKLCH

oklch(37.5%, 0.1074, 259.59)

HWB

hwb(217, 10.6%, 52.5%)

Harmony colors

Complementary

#79551b

Analogous

#1b6e79

#1b3f79

#261b79

Triadic

#1b3f79

#791b3f

#3f791b

Split-complementary

#1b3f79

#79261b

#6e791b

Tetradic

#1b3f79

#551b79

#79551b

#3f791b

Square

#1b3f79

#791b6e

#79551b

#1b7926

Shades

Color #1b3f79 mixed toward black.

#163465

#122a51

#0d1f3c

#091528

#040a14

Tints

Color #1b3f79 mixed toward white.

#2659aa

#3a74d3

#6b97de

#9cbae9

#cedcf4

Tones

Color #1b3f79 mixed toward gray.

#234171

#2b4369

#324461

#3a465a

#424852

Accessibility

Aa White text on this color

10.33:1

Aa Black text on this color

2.03:1

White text reads better on this background (10.33:1). That passes WCAG AAA (≥7:1) for normal-size text.

Under color vision deficiencies

Protanopia

#2e2f6e · ΔE 7.9

Deuteranopia

#2c296c · ΔE 9.5

Tritanopia

#1e6563 · ΔE 26.8

Achromatopsia

#404040 · ΔE 20.7

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

Code

CSS

background-color: #1b3f79;

Tailwind (arbitrary value)

bg-[#1b3f79]

Related colors

Cornflower Blue #6495ed

Light Steel Blue #b0c4de

Light Slate Gray #778899

Slate Gray #708090

Dodger Blue #1e90ff

Royal Blue #4169e1

Frequently asked questions

#1b3f79 (#1b3f79) is rgb(27, 63, 121) in RGB.

No, #1b3f79 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 #1b3f79, or check how it holds up for accessibility.

Generate a palette → Check contrast