#1B377C#1B377C

#1B377C is a dark, vivid blue. Relative luminance 0.044; OKLCH L 35.9% C 0.122 H 264.4°. Best body text is #FFFFFF at 11.15:1 contrast (WCAG AA passes).

Color values

HEX	#1B377C
RGB	rgb(27, 55, 124)
HSL	hsl(223, 64%, 30%)
HSV	hsv(223, 78%, 49%)
CMYK	cmyk(78.2%, 55.6%, 0%, 51.4%)
CIE-LAB	lab(25.01, 16.08, -42.27)
CIE-LCH	lch(25.01, 45.23, 290.83°)
OKLab	oklab(35.93% -0.012 -0.1218)
OKLCH	oklch(35.93% 0.122 264.4)
XYZ	xyz(5.4550, 4.4200, 19.6305)
Luminance	0.0442 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B377C #7C601B

analogous

#1B687C #1B377C #2F1B7C

triadic

#1B377C #7C1B37 #377C1B

tetradic

#1B377C #7C1B68 #7C601B #1B7C2F

square

#1B377C #7C1B68 #7C601B #1B7C2F

split-complementary

#1B377C #7C2F1B #687C1B

monochromatic

#050B19 #10214A #1B377C #264DAE #3D69D5

Accessibility & contrast

On white

11.15

#1B377C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.88

#1B377C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B377C

11.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B377C	#FFFFFF	#000000	##FFFFFF
##1B377C	1.00	11.15	1.88	11.15
#FFFFFF	11.15	1.00	21.00	1.00
#000000	1.88	21.00	1.00	21.00
##FFFFFF	11.15	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#02407E

Deuteranopia (green-blind)

#00377B

Tritanopia (blue-blind)

#004854

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #1b377c;
/* rgb */ color: rgb(27, 55, 124);
/* oklch */ color: oklch(35.9% 0.122 264.4);

Tailwind

colors: {
  custom: {
    50: '#676da2',
    500: '#1b377c',
    950: '#000000',
  },
}

SCSS

$custom: #1b377c;
$custom-light: #676da2;
$custom-dark: #000000;

JSON

{
  "hex": "#1b377c",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 124
  },
  "hsl": {
    "h": 222.68,
    "s": 64.238,
    "l": 29.608
  },
  "oklch": {
    "l": 0.3593,
    "c": 0.12237,
    "h": 264.4
  },
  "luminance": 0.04421
}

Semantic roles & 50–950 ramp

primary

#1B377C

secondary

#B09043

accent

#B741E7

background

#F6F6FA

surface

#EBEBF4

border

#C6C6CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1B377C

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

Preview Lab → · Contrast checker → · Palette generator →