#1B588C#1B588C

#1B588C is a dark, moderate cyan. Relative luminance 0.091; OKLCH L 44.9% C 0.105 H 248.6°. Best body text is #FFFFFF at 7.44:1 contrast (WCAG AA passes).

Color values

HEX	#1B588C
RGB	rgb(27, 88, 140)
HSL	hsl(208, 68%, 33%)
HSV	hsv(208, 81%, 55%)
CMYK	cmyk(80.7%, 37.1%, 0%, 45.1%)
CIE-LAB	lab(36.19, 0.17, -34.27)
CIE-LCH	lch(36.19, 34.27, 270.28°)
OKLab	oklab(44.91% -0.0383 -0.0976)
OKLCH	oklch(44.91% 0.105 248.6)
XYZ	xyz(8.6735, 9.1049, 26.1061)
Luminance	0.0911 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B588C #8C4F1B

analogous

#1B8C88 #1B588C #1B1F8C

triadic

#1B588C #8C1B58 #588C1B

tetradic

#1B588C #881B8C #8C4F1B #1F8C1B

square

#1B588C #881B8C #8C4F1B #1F8C1B

split-complementary

#1B588C #8C1B1F #8C881B

monochromatic

#071825 #113859 #1B588C #2578BF #4697DB

Accessibility & contrast

On white

7.44

#1B588C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.82

#1B588C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B588C

7.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B588C	#FFFFFF	#000000	##FFFFFF
##1B588C	1.00	7.44	2.82	7.44
#FFFFFF	7.44	1.00	21.00	1.00
#000000	2.82	21.00	1.00	21.00
##FFFFFF	7.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#405B8E

Deuteranopia (green-blind)

#2F508B

Tritanopia (blue-blind)

#00646B

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #1b588c;
/* rgb */ color: rgb(27, 88, 140);
/* oklch */ color: oklch(44.9% 0.105 248.6);

Tailwind

colors: {
  custom: {
    50: '#6a86ae',
    500: '#1b588c',
    950: '#000000',
  },
}

SCSS

$custom: #1b588c;
$custom-light: #6a86ae;
$custom-dark: #000000;

JSON

{
  "hex": "#1b588c",
  "rgb": {
    "r": 27,
    "g": 88,
    "b": 140
  },
  "hsl": {
    "h": 207.611,
    "s": 67.665,
    "l": 32.745
  },
  "oklch": {
    "l": 0.44906,
    "c": 0.10487,
    "h": 248.6
  },
  "luminance": 0.09106
}

Semantic roles & 50–950 ramp

primary

#1B588C

secondary

#BD7D46

accent

#8D3DEB

background

#F6F8FA

surface

#ECEFF4

border

#C7CACE

text

#070B10

muted

#7A7C7F

Preview Lab

Preview with #1B588C

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

Preview Lab → · Contrast checker → · Palette generator →