#1B578F#1B578F

#1B578F is a dark, moderate cyan. Relative luminance 0.090; OKLCH L 44.9% C 0.110 H 250.6°. Best body text is #FFFFFF at 7.48:1 contrast (WCAG AA passes).

Color values

HEX	#1B578F
RGB	rgb(27, 87, 143)
HSL	hsl(209, 68%, 33%)
HSV	hsv(209, 81%, 56%)
CMYK	cmyk(81.1%, 39.2%, 0%, 43.9%)
CIE-LAB	lab(36.04, 2.00, -36.32)
CIE-LCH	lch(36.04, 36.38, 273.16°)
OKLab	oklab(44.85% -0.0365 -0.1036)
OKLCH	oklch(44.85% 0.11 250.6)
XYZ	xyz(8.8162, 9.0315, 27.2599)
Luminance	0.0903 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B578F #8F531B

analogous

#1B8F8D #1B578F #1B1D8F

triadic

#1B578F #8F1B57 #578F1B

tetradic

#1B578F #8D1B8F #8F531B #1D8F1B

square

#1B578F #8D1B8F #8F531B #1D8F1B

split-complementary

#1B578F #8F1B1D #8F8D1B

monochromatic

#081828 #11385C #1B578F #2576C2 #4895DC

Accessibility & contrast

On white

7.48

#1B578F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.81

#1B578F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B578F

7.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B578F	#FFFFFF	#000000	##FFFFFF
##1B578F	1.00	7.48	2.81	7.48
#FFFFFF	7.48	1.00	21.00	1.00
#000000	2.81	21.00	1.00	21.00
##FFFFFF	7.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3C5B91

Deuteranopia (green-blind)

#2A508E

Tritanopia (blue-blind)

#00646C

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #1b578f;
/* rgb */ color: rgb(27, 87, 143);
/* oklch */ color: oklch(44.9% 0.110 250.6);

Tailwind

colors: {
  custom: {
    50: '#6b86b0',
    500: '#1b578f',
    950: '#000000',
  },
}

SCSS

$custom: #1b578f;
$custom-light: #6b86b0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b578f",
  "rgb": {
    "r": 27,
    "g": 87,
    "b": 143
  },
  "hsl": {
    "h": 208.966,
    "s": 68.235,
    "l": 33.333
  },
  "oklch": {
    "l": 0.44852,
    "c": 0.10989,
    "h": 250.6
  },
  "luminance": 0.09033
}

Semantic roles & 50–950 ramp

primary

#1B578F

secondary

#BE8148

accent

#913DEB

background

#F6F8FA

surface

#ECEFF5

border

#C7CACF

text

#080B10

muted

#7A7C7F

Preview Lab

Preview with #1B578F

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

Preview Lab → · Contrast checker → · Palette generator →