#1B377D#1B377D

#1B377D is a dark, vivid blue. Relative luminance 0.044; OKLCH L 36.0% C 0.124 H 264.5°. Best body text is #FFFFFF at 11.12:1 contrast (WCAG AA passes).

Color values

HEX	#1B377D
RGB	rgb(27, 55, 125)
HSL	hsl(223, 64%, 30%)
HSV	hsv(223, 78%, 49%)
CMYK	cmyk(78.4%, 56%, 0%, 51%)
CIE-LAB	lab(25.09, 16.49, -42.77)
CIE-LCH	lch(25.09, 45.84, 291.08°)
OKLab	oklab(36.01% -0.0119 -0.1233)
OKLCH	oklch(36.01% 0.124 264.5)
XYZ	xyz(5.5185, 4.4454, 19.9653)
Luminance	0.0445 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B377D #7D611B

analogous

#1B687D #1B377D #301B7D

triadic

#1B377D #7D1B37 #377D1B

tetradic

#1B377D #7D1B68 #7D611B #1B7D30

square

#1B377D #7D1B68 #7D611B #1B7D30

split-complementary

#1B377D #7D301B #687D1B

monochromatic

#050B19 #10214B #1B377D #264DAF #3D69D5

Accessibility & contrast

On white

11.12

#1B377D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#1B377D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B377D

11.12:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B377D	#FFFFFF	#000000	##FFFFFF
##1B377D	1.00	11.12	1.89	11.12
#FFFFFF	11.12	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.12	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00407F

Deuteranopia (green-blind)

#00377C

Tritanopia (blue-blind)

#004854

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #1b377d;
/* rgb */ color: rgb(27, 55, 125);
/* oklch */ color: oklch(36.0% 0.124 264.5);

Tailwind

colors: {
  custom: {
    50: '#676da3',
    500: '#1b377d',
    950: '#000000',
  },
}

SCSS

$custom: #1b377d;
$custom-light: #676da3;
$custom-dark: #000000;

JSON

{
  "hex": "#1b377d",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 125
  },
  "hsl": {
    "h": 222.857,
    "s": 64.474,
    "l": 29.804
  },
  "oklch": {
    "l": 0.36014,
    "c": 0.12383,
    "h": 264.5
  },
  "luminance": 0.04446
}

Semantic roles & 50–950 ramp

primary

#1B377D

secondary

#B19143

accent

#B840E7

background

#F6F6FA

surface

#EBEBF4

border

#C6C6CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1B377D

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

Preview Lab → · Contrast checker → · Palette generator →