#1f4581

Color #1f4581

A moderately saturated dark blue.

Closest named color Dark Slate Blue #483d8b · ΔE 17.71 Nearest Tailwind class blue-900 #1c398e · ΔE 5.2

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

Conversions

HEX

#1f4581

RGB

rgb(31, 69, 129)

HSL

hsl(216.7, 61.2%, 31.4%)

HSV / HSB

hsv(216.7, 76%, 50.6%)

CMYK

cmyk(76%, 46.5%, 0%, 49.4%)

LAB

lab(29.74, 8.91, -37.77)

LCH

lch(29.74, 38.81, 283.27)

OKLCH

oklch(39.7%, 0.1101, 259.27)

HWB

hwb(216.7, 12.2%, 49.4%)

Harmony colors

Complementary

#815b1f

Analogous

#1f7681

#1f4581

#2a1f81

Triadic

#1f4581

#811f45

#45811f

Split-complementary

#1f4581

#812a1f

#76811f

Tetradic

#1f4581

#5b1f81

#815b1f

#45811f

Square

#1f4581

#811f76

#815b1f

#1f812a

Shades

Color #1f4581 mixed toward black.

#1a3a6c

#152e56

#102341

#0a172b

#050c16

Tints

Color #1f4581 mixed toward white.

#2a5eb0

#437ad2

#729cdd

#a1bde8

#d0def4

Tones

Color #1f4581 mixed toward gray.

#274779

#2f4971

#384b69

#404c60

#484e58

Accessibility

Aa White text on this color

9.43:1

Aa Black text on this color

2.23:1

White text reads better on this background (9.43:1). That passes WCAG AAA (≥7:1) for normal-size text.

Under color vision deficiencies

Protanopia

#333476 · ΔE 8.4

Deuteranopia

#312e73 · ΔE 10

Tritanopia

#226c6a · ΔE 27

Achromatopsia

#464646 · ΔE 20.9

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

Code

CSS

background-color: #1f4581;

Tailwind (arbitrary value)

bg-[#1f4581]

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

#1f4581 (#1f4581) is rgb(31, 69, 129) in RGB.

No, #1f4581 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 #1f4581, or check how it holds up for accessibility.

Generate a palette → Check contrast