#123f8a

Color #123f8a

A vivid, highly saturated dark blue.

Closest named color Dark Slate Blue #483d8b · ΔE 11.74 Nearest Tailwind class blue-900 #1c398e · ΔE 3

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

Conversions

HEX

#123f8a

RGB

rgb(18, 63, 138)

HSL

hsl(217.5, 76.9%, 30.6%)

HSV / HSB

hsv(217.5, 87%, 54.1%)

CMYK

cmyk(87%, 54.3%, 0%, 45.9%)

LAB

lab(28.16, 15.29, -45.93)

LCH

lch(28.16, 48.41, 288.41)

OKLCH

oklch(38.6%, 0.1344, 260.28)

HWB

hwb(217.5, 7.1%, 45.9%)

Harmony colors

Complementary

#8a5d12

Analogous

#127b8a

#123f8a

#21128a

Triadic

#123f8a

#8a123f

#3f8a12

Split-complementary

#123f8a

#8a2112

#7b8a12

Tetradic

#123f8a

#5d128a

#8a5d12

#3f8a12

Square

#123f8a

#8a127b

#8a5d12

#128a21

Shades

Color #123f8a mixed toward black.

#0f3573

#0c2a5c

#092045

#06152e

#030b17

Tints

Color #123f8a mixed toward white.

#1957be

#2e72e4

#6296eb

#97b9f1

#cbdcf8

Tones

Color #123f8a mixed toward gray.

#1c4280

#264476

#30476c

#3a4962

#444c58

Accessibility

Aa White text on this color

9.98:1

Aa Black text on this color

2.1:1

White text reads better on this background (9.98:1). That passes WCAG AAA (≥7:1) for normal-size text.

Under color vision deficiencies

Protanopia

#2c2c7d · ΔE 8.2

Deuteranopia

#292679 · ΔE 9.7

Tritanopia

#16716e · ΔE 31.1

Achromatopsia

#424242 · ΔE 23.4

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

Code

CSS

background-color: #123f8a;

Tailwind (arbitrary value)

bg-[#123f8a]

Related colors

Cornflower Blue #6495ed

Light Steel Blue #b0c4de

Royal Blue #4169e1

Light Slate Gray #778899

Slate Gray #708090

Dodger Blue #1e90ff

Frequently asked questions

#123f8a (#123f8a) is rgb(18, 63, 138) in RGB.

No, #123f8a 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 #123f8a, or check how it holds up for accessibility.

Generate a palette → Check contrast