#155aaa

Color #155aaa

A vivid, highly saturated dark blue.

Closest named color Dark Slate Blue #483d8b · ΔE 18.66 Nearest Tailwind class sky-800 #00598a · ΔE 5.7

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

Conversions

HEX

#155aaa

RGB

rgb(21, 90, 170)

HSL

hsl(212.2, 78%, 37.5%)

HSV / HSB

hsv(212.2, 87.6%, 66.7%)

CMYK

cmyk(87.6%, 47.1%, 0%, 33.3%)

LAB

lab(38.5, 10.34, -48.59)

LCH

lch(38.5, 49.68, 282.01)

OKLCH

oklch(47.3%, 0.1442, 255.63)

HWB

hwb(212.2, 8.2%, 33.3%)

Harmony colors

Complementary

#aa6515

Analogous

#15a5aa

#155aaa

#1b15aa

Triadic

#155aaa

#aa155a

#5aaa15

Split-complementary

#155aaa

#aa1b15

#a5aa15

Tetradic

#155aaa

#6515aa

#aa6515

#5aaa15

Square

#155aaa

#aa15a5

#aa6515

#15aa1b

Shades

Color #155aaa mixed toward black.

#124b8e

#0e3c71

#0b2d55

#071e39

#040f1c

Tints

Color #155aaa mixed toward white.

#1b73d9

#428fe8

#71abed

#a0c7f3

#d0e3f9

Tones

Color #155aaa mixed toward gray.

#215b9e

#2e5c91

#3a5d85

#475e78

#535f6c

Accessibility

Aa White text on this color

6.83:1

Aa Black text on this color

3.07:1

White text reads better on this background (6.83:1). That passes WCAG AA (≥4.5:1) for normal-size text, but not AAA.

Under color vision deficiencies

Protanopia

#3e3f9b · ΔE 12.2

Deuteranopia

#3b3598 · ΔE 14.8

Tritanopia

#1d8e8b · ΔE 31.8

Achromatopsia

#5b5b5b · ΔE 23.5

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

Code

CSS

background-color: #155aaa;

Tailwind (arbitrary value)

bg-[#155aaa]

Related colors

Light Steel Blue #b0c4de

Light Slate Gray #778899

Slate Gray #708090

Dodger Blue #1e90ff

Alice Blue #f0f8ff

Steel Blue #4682b4

Frequently asked questions

#155aaa (#155aaa) is rgb(21, 90, 170) in RGB.

No, #155aaa 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 #155aaa, or check how it holds up for accessibility.

Generate a palette → Check contrast