#1B378B#1B378B

#1B378B is a dark, vivid blue. Relative luminance 0.048; OKLCH L 37.2% C 0.144 H 265.6°. Best body text is #FFFFFF at 10.68:1 contrast (WCAG AA passes).

Color values

HEX	#1B378B
RGB	rgb(27, 55, 139)
HSL	hsl(225, 67%, 33%)
HSV	hsv(225, 81%, 55%)
CMYK	cmyk(80.6%, 60.4%, 0%, 45.5%)
CIE-LAB	lab(26.24, 22.15, -49.66)
CIE-LCH	lch(26.24, 54.37, 294.04°)
OKLab	oklab(37.24% -0.011 -0.1435)
OKLCH	oklch(37.24% 0.144 265.6)
XYZ	xyz(6.4767, 4.8287, 25.0118)
Luminance	0.0483 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B378B #8B6F1B

analogous

#1B6F8B #1B378B #371B8B

triadic

#1B378B #8B1B37 #378B1B

tetradic

#1B378B #8B1B6F #8B6F1B #1B8B37

square

#1B378B #8B1B6F #8B6F1B #1B8B37

split-complementary

#1B378B #8B371B #6F8B1B

monochromatic

#070E25 #112358 #1B378B #254BBE #456BDB

Accessibility & contrast

On white

10.68

#1B378B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.97

#1B378B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B378B

10.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B378B	#FFFFFF	#000000	##FFFFFF
##1B378B	1.00	10.68	1.97	10.68
#FFFFFF	10.68	1.00	21.00	1.00
#000000	1.97	21.00	1.00	21.00
##FFFFFF	10.68	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00438E

Deuteranopia (green-blind)

#003989

Tritanopia (blue-blind)

#004C5B

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1b378b;
/* rgb */ color: rgb(27, 55, 139);
/* oklch */ color: oklch(37.2% 0.144 265.6);

Tailwind

colors: {
  custom: {
    50: '#6b6dae',
    500: '#1b378b',
    950: '#000000',
  },
}

SCSS

$custom: #1b378b;
$custom-light: #6b6dae;
$custom-dark: #000000;

JSON

{
  "hex": "#1b378b",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 139
  },
  "hsl": {
    "h": 225,
    "s": 67.47,
    "l": 32.549
  },
  "oklch": {
    "l": 0.37239,
    "c": 0.1439,
    "h": 265.6
  },
  "luminance": 0.04829
}

Semantic roles & 50–950 ramp

primary

#1B378B

secondary

#BC9F45

accent

#BF3DEA

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #1B378B

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →