#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
RGBrgb(27, 87, 143)
HSLhsl(209, 68%, 33%)
HSVhsv(209, 81%, 56%)
CMYKcmyk(81.1%, 39.2%, 0%, 43.9%)
CIE-LABlab(36.04, 2.00, -36.32)
CIE-LCHlch(36.04, 36.38, 273.16°)
OKLaboklab(44.85% -0.0365 -0.1036)
OKLCHoklch(44.85% 0.11 250.6)
XYZxyz(8.8162, 9.0315, 27.2599)
Luminance0.0903 (WCAG relative)
Temperaturecool
Familycyan

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
##1B578F1.007.482.817.48
#FFFFFF7.481.0021.001.00
#0000002.8121.001.0021.00
##FFFFFF7.481.0021.001.00

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 →

#1B578F Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva