#1B378E#1B378E

#1B378E is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.5% C 0.148 H 265.8°. Best body text is #FFFFFF at 10.59:1 contrast (WCAG AA passes).

Color values

HEX	#1B378E
RGB	rgb(27, 55, 142)
HSL	hsl(225, 68%, 33%)
HSV	hsv(225, 81%, 56%)
CMYK	cmyk(81%, 61.3%, 0%, 44.3%)
CIE-LAB	lab(26.50, 23.35, -51.10)
CIE-LCH	lch(26.50, 56.18, 294.56°)
OKLab	oklab(37.51% -0.0109 -0.1477)
OKLCH	oklch(37.51% 0.148 265.8)
XYZ	xyz(6.6989, 4.9176, 26.1821)
Luminance	0.0492 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B378E #8E721B

analogous

#1B708E #1B378E #381B8E

triadic

#1B378E #8E1B37 #378E1B

tetradic

#1B378E #8E1B70 #8E721B #1B8E38

square

#1B378E #8E1B70 #8E721B #1B8E38

split-complementary

#1B378E #8E381B #708E1B

monochromatic

#070F27 #11235B #1B378E #254BC1 #476CDC

Accessibility & contrast

On white

10.59

#1B378E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.98

#1B378E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B378E

10.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B378E	#FFFFFF	#000000	##FFFFFF
##1B378E	1.00	10.59	1.98	10.59
#FFFFFF	10.59	1.00	21.00	1.00
#000000	1.98	21.00	1.00	21.00
##FFFFFF	10.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004491

Deuteranopia (green-blind)

#00398C

Tritanopia (blue-blind)

#004D5D

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1b378e;
/* rgb */ color: rgb(27, 55, 142);
/* oklch */ color: oklch(37.5% 0.148 265.8);

Tailwind

colors: {
  custom: {
    50: '#6c6db0',
    500: '#1b378e',
    950: '#000000',
  },
}

SCSS

$custom: #1b378e;
$custom-light: #6c6db0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b378e",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 142
  },
  "hsl": {
    "h": 225.391,
    "s": 68.047,
    "l": 33.137
  },
  "oklch": {
    "l": 0.37511,
    "c": 0.1481,
    "h": 265.8
  },
  "luminance": 0.04918
}

Semantic roles & 50–950 ramp

primary

#1B378E

secondary

#BEA147

accent

#C13DEB

background

#F7F6FA

surface

#EDEBF5

border

#C8C6CF

text

#080711

muted

#7B7A80

Preview Lab

Preview with #1B378E

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

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