#1B578D#1B578D

#1B578D is a dark, moderate cyan. Relative luminance 0.090; OKLCH L 44.7% C 0.107 H 249.8°. Best body text is #FFFFFF at 7.52:1 contrast (WCAG AA passes).

Color values

HEX	#1B578D
RGB	rgb(27, 87, 141)
HSL	hsl(208, 68%, 33%)
HSV	hsv(208, 81%, 55%)
CMYK	cmyk(80.9%, 38.3%, 0%, 44.7%)
CIE-LAB	lab(35.93, 1.21, -35.29)
CIE-LCH	lch(35.93, 35.31, 271.96°)
OKLab	oklab(44.72% -0.0371 -0.1006)
OKLCH	oklch(44.72% 0.107 249.8)
XYZ	xyz(8.6661, 8.9714, 26.4691)
Luminance	0.0897 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B578D #8D511B

analogous

#1B8D8A #1B578D #1B1E8D

triadic

#1B578D #8D1B57 #578D1B

tetradic

#1B578D #8A1B8D #8D511B #1E8D1B

square

#1B578D #8A1B8D #8D511B #1E8D1B

split-complementary

#1B578D #8D1B1E #8D8A1B

monochromatic

#071826 #11375A #1B578D #2577C0 #4795DC

Accessibility & contrast

On white

7.52

#1B578D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.79

#1B578D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B578D

7.52:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B578D	#FFFFFF	#000000	##FFFFFF
##1B578D	1.00	7.52	2.79	7.52
#FFFFFF	7.52	1.00	21.00	1.00
#000000	2.79	21.00	1.00	21.00
##FFFFFF	7.52	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3E5A8F

Deuteranopia (green-blind)

#2C508C

Tritanopia (blue-blind)

#00646B

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #1b578d;
/* rgb */ color: rgb(27, 87, 141);
/* oklch */ color: oklch(44.7% 0.107 249.8);

Tailwind

colors: {
  custom: {
    50: '#6a86ae',
    500: '#1b578d',
    950: '#000000',
  },
}

SCSS

$custom: #1b578d;
$custom-light: #6a86ae;
$custom-dark: #000000;

JSON

{
  "hex": "#1b578d",
  "rgb": {
    "r": 27,
    "g": 87,
    "b": 141
  },
  "hsl": {
    "h": 208.421,
    "s": 67.857,
    "l": 32.941
  },
  "oklch": {
    "l": 0.44723,
    "c": 0.10723,
    "h": 249.8
  },
  "luminance": 0.08972
}

Semantic roles & 50–950 ramp

primary

#1B578D

secondary

#BD7F46

accent

#8F3DEB

background

#F6F8FA

surface

#ECEFF4

border

#C7CACE

text

#070B10

muted

#7A7C7F

Preview Lab

Preview with #1B578D

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

Preview Lab → · Contrast checker → · Palette generator →