#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
RGBrgb(27, 87, 141)
HSLhsl(208, 68%, 33%)
HSVhsv(208, 81%, 55%)
CMYKcmyk(80.9%, 38.3%, 0%, 44.7%)
CIE-LABlab(35.93, 1.21, -35.29)
CIE-LCHlch(35.93, 35.31, 271.96°)
OKLaboklab(44.72% -0.0371 -0.1006)
OKLCHoklch(44.72% 0.107 249.8)
XYZxyz(8.6661, 8.9714, 26.4691)
Luminance0.0897 (WCAG relative)
Temperaturecool
Familycyan

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
##1B578D1.007.522.797.52
#FFFFFF7.521.0021.001.00
#0000002.7921.001.0021.00
##FFFFFF7.521.0021.001.00

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 →

#1B578D Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva