#18578B#18578B

#18578B is a dark, moderate cyan. Relative luminance 0.089; OKLCH L 44.5% C 0.106 H 248.2°. Best body text is #FFFFFF at 7.57:1 contrast (WCAG AA passes).

Color values

HEX#18578B
RGBrgb(24, 87, 139)
HSLhsl(207, 71%, 32%)
HSVhsv(207, 83%, 55%)
CMYKcmyk(82.7%, 37.4%, 0%, 45.5%)
CIE-LABlab(35.74, 0.08, -34.38)
CIE-LCHlch(35.74, 34.38, 270.14°)
OKLaboklab(44.52% -0.0392 -0.098)
OKLCHoklch(44.52% 0.106 248.2)
XYZxyz(8.4433, 8.8736, 25.6889)
Luminance0.0887 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#18578B #8B4C18
analogous
#188B85 #18578B #181E8B
triadic
#18578B #8B1857 #578B18
tetradic
#18578B #85188B #8B4C18 #1E8B18
square
#18578B #85188B #8B4C18 #1E8B18
split-complementary
#18578B #8B181E #8B8518
monochromatic
#061623 #0F3657 #18578B #2178BF #3F96DE

Accessibility & contrast

On white

7.57
#18578B on #FFFFFF
AA ✓AA large ✓AAA ✓

On black

2.77
#18578B on #000000
AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #18578B
7.57:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##18578B#FFFFFF#000000##FFFFFF
##18578B1.007.572.777.57
#FFFFFF7.571.0021.001.00
#0000002.7721.001.0021.00
##FFFFFF7.571.0021.001.00

Color blindness preview

Protanopia (red-blind)
#3E5A8D
Deuteranopia (green-blind)
#2D4F8A
Tritanopia (blue-blind)
#00646A
Achromatopsia (no color)
#545454

Design tokens & code

CSS
--color: #18578b;
/* rgb */ color: rgb(24, 87, 139);
/* oklch */ color: oklch(44.5% 0.106 248.2);
Tailwind
colors: {
  custom: {
    50: '#6986ad',
    500: '#18578b',
    950: '#000000',
  },
}
SCSS
$custom: #18578b;
$custom-light: #6986ad;
$custom-dark: #000000;
JSON
{
  "hex": "#18578b",
  "rgb": {
    "r": 24,
    "g": 87,
    "b": 139
  },
  "hsl": {
    "h": 207.13,
    "s": 70.552,
    "l": 31.961
  },
  "oklch": {
    "l": 0.44516,
    "c": 0.10551,
    "h": 248.2
  },
  "luminance": 0.08875
}

Semantic roles & 50–950 ramp

primary
#18578B
secondary
#BE7940
accent
#8B3AED
background
#F6F8FA
surface
#ECEFF4
border
#C7CACE
text
#070B10
muted
#7A7C7F

Preview Lab

Preview with #18578B

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

Preview Lab → · Contrast checker → · Palette generator →

#18578B Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva