#3757a1

Color #3757a1

A moderately saturated medium blue.

Closest named color Dark Slate Blue #483d8b · ΔE 15.02 Nearest Tailwind class sky-800 #00598a · ΔE 8.4

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

Conversions

HEX

#3757a1

RGB

rgb(55, 87, 161)

HSL

hsl(221.9, 49.1%, 42.4%)

HSV / HSB

hsv(221.9, 65.8%, 63.1%)

CMYK

cmyk(65.8%, 46%, 0%, 36.9%)

LAB

lab(38.2, 13.06, -43.66)

LCH

lch(38.2, 45.57, 286.65)

OKLCH

oklch(47.2%, 0.1254, 264.51)

HWB

hwb(221.9, 21.6%, 36.9%)

Harmony colors

Complementary

#a18137

Analogous

#378ca1

#3757a1

#4c37a1

Triadic

#3757a1

#a13757

#57a137

Split-complementary

#3757a1

#a14c37

#8ca137

Tetradic

#3757a1

#8137a1

#a18137

#57a137

Square

#3757a1

#a1378c

#a18137

#37a14c

Shades

Color #3757a1 mixed toward black.

#2e4986

#253a6b

#1c2c51

#121d36

#090f1b

Tints

Color #3757a1 mixed toward white.

#496dc1

#6d8acd

#92a7da

#b6c5e6

#dbe2f3

Tones

Color #3757a1 mixed toward gray.

#405b98

#495e90

#526287

#5a657e

#636975

Accessibility

Aa White text on this color

6.91:1

Aa Black text on this color

3.04:1

White text reads better on this background (6.91:1). That passes WCAG AA (≥4.5:1) for normal-size text, but not AAA.

Under color vision deficiencies

Protanopia

#474793 · ΔE 7.6

Deuteranopia

#454390 · ΔE 8.6

Tritanopia

#398784 · ΔE 30.3

Achromatopsia

#5a5a5a · ΔE 22.7

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

Code

CSS

background-color: #3757a1;

Tailwind (arbitrary value)

bg-[#3757a1]

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

#3757a1 (#3757a1) is rgb(55, 87, 161) in RGB.

No, #3757a1 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 #3757a1, or check how it holds up for accessibility.

Generate a palette → Check contrast