#1B378D#1B378D

#1B378D is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.4% C 0.147 H 265.7°. Best body text is #FFFFFF at 10.62:1 contrast (WCAG AA passes).

Color values

HEX	#1B378D
RGB	rgb(27, 55, 141)
HSL	hsl(225, 68%, 33%)
HSV	hsv(225, 81%, 55%)
CMYK	cmyk(80.9%, 61%, 0%, 44.7%)
CIE-LAB	lab(26.41, 22.95, -50.62)
CIE-LCH	lch(26.41, 55.58, 294.39°)
OKLab	oklab(37.42% -0.011 -0.1463)
OKLCH	oklch(37.42% 0.147 265.7)
XYZ	xyz(6.6242, 4.8877, 25.7884)
Luminance	0.0489 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B378D #8D711B

analogous

#1B708D #1B378D #381B8D

triadic

#1B378D #8D1B37 #378D1B

tetradic

#1B378D #8D1B70 #8D711B #1B8D38

square

#1B378D #8D1B70 #8D711B #1B8D38

split-complementary

#1B378D #8D381B #708D1B

monochromatic

#070F26 #11235A #1B378D #254BC0 #476BDC

Accessibility & contrast

On white

10.62

#1B378D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.98

#1B378D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B378D

10.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B378D	#FFFFFF	#000000	##FFFFFF
##1B378D	1.00	10.62	1.98	10.62
#FFFFFF	10.62	1.00	21.00	1.00
#000000	1.98	21.00	1.00	21.00
##FFFFFF	10.62	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004490

Deuteranopia (green-blind)

#00398B

Tritanopia (blue-blind)

#004D5C

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1b378d;
/* rgb */ color: rgb(27, 55, 141);
/* oklch */ color: oklch(37.4% 0.147 265.7);

Tailwind

colors: {
  custom: {
    50: '#6b6daf',
    500: '#1b378d',
    950: '#000000',
  },
}

SCSS

$custom: #1b378d;
$custom-light: #6b6daf;
$custom-dark: #000000;

JSON

{
  "hex": "#1b378d",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 141
  },
  "hsl": {
    "h": 225.263,
    "s": 67.857,
    "l": 32.941
  },
  "oklch": {
    "l": 0.3742,
    "c": 0.14671,
    "h": 265.7
  },
  "luminance": 0.04888
}

Semantic roles & 50–950 ramp

primary

#1B378D

secondary

#BDA046

accent

#C03DEB

background

#F7F6FA

surface

#EDEBF5

border

#C8C6CF

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #1B378D

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

Preview Lab → · Contrast checker → · Palette generator →