#1B375B#1B375B

#1B375B is a dark, moderate cyan. Relative luminance 0.037; OKLCH L 33.4% C 0.072 H 255.6°. Best body text is #FFFFFF at 12.04:1 contrast (WCAG AA passes).

Color values

HEX	#1B375B
RGB	rgb(27, 55, 91)
HSL	hsl(214, 54%, 23%)
HSV	hsv(214, 70%, 36%)
CMYK	cmyk(70.3%, 39.6%, 0%, 64.3%)
CIE-LAB	lab(22.72, 2.63, -24.71)
CIE-LCH	lch(22.72, 24.85, 276.07°)
OKLab	oklab(33.44% -0.018 -0.0702)
OKLCH	oklch(33.44% 0.072 255.6)
XYZ	xyz(3.7058, 3.7204, 10.4183)
Luminance	0.0372 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B375B #5B3F1B

analogous

#1B575B #1B375B #1F1B5B

triadic

#1B375B #5B1B37 #375B1B

tetradic

#1B375B #5B1B57 #5B3F1B #1B5B1F

square

#1B375B #5B1B57 #5B3F1B #1B5B1F

split-complementary

#1B375B #5B1F1B #575B1B

monochromatic

#070E18 #0D1A2C #1B375B #29548A #3770B9

Accessibility & contrast

On white

12.04

#1B375B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.74

#1B375B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B375B

12.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B375B	#FFFFFF	#000000	##FFFFFF
##1B375B	1.00	12.04	1.74	12.04
#FFFFFF	12.04	1.00	21.00	1.00
#000000	1.74	21.00	1.00	21.00
##FFFFFF	12.04	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#273A5C

Deuteranopia (green-blind)

#1E345A

Tritanopia (blue-blind)

#003F44

Achromatopsia (no color)

#363636

Design tokens & code

CSS

--color: #1b375b;
/* rgb */ color: rgb(27, 55, 91);
/* oklch */ color: oklch(33.4% 0.072 255.6);

Tailwind

colors: {
  custom: {
    50: '#5f6d89',
    500: '#1b375b',
    950: '#000000',
  },
}

SCSS

$custom: #1b375b;
$custom-light: #5f6d89;
$custom-dark: #000000;

JSON

{
  "hex": "#1b375b",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 91
  },
  "hsl": {
    "h": 213.75,
    "s": 54.237,
    "l": 23.137
  },
  "oklch": {
    "l": 0.33436,
    "c": 0.07245,
    "h": 255.6
  },
  "luminance": 0.03721
}

Semantic roles & 50–950 ramp

primary

#1B375B

secondary

#916E41

accent

#9D4ADE

background

#F5F6F8

surface

#EAEBF0

border

#C6C6CB

text

#05070B

muted

#797A7C

Preview Lab

Preview with #1B375B

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

Preview Lab → · Contrast checker → · Palette generator →