#1B588B#1B588B

#1B588B is a dark, moderate cyan. Relative luminance 0.091; OKLCH L 44.8% C 0.104 H 248.1°. Best body text is #FFFFFF at 7.46:1 contrast (WCAG AA passes).

Color values

HEX#1B588B
RGBrgb(27, 88, 139)
HSLhsl(207, 67%, 33%)
HSVhsv(207, 81%, 55%)
CMYKcmyk(80.6%, 36.7%, 0%, 45.5%)
CIE-LABlab(36.13, -0.23, -33.75)
CIE-LCHlch(36.13, 33.75, 269.62°)
OKLaboklab(44.84% -0.0386 -0.0961)
OKLCHoklch(44.84% 0.104 248.1)
XYZxyz(8.6001, 9.0755, 25.7196)
Luminance0.0908 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#1B588B #8B4E1B
analogous
#1B8B86 #1B588B #1B208B
triadic
#1B588B #8B1B58 #588B1B
tetradic
#1B588B #861B8B #8B4E1B #208B1B
square
#1B588B #861B8B #8B4E1B #208B1B
split-complementary
#1B588B #8B1B20 #8B861B
monochromatic
#071725 #113858 #1B588B #2578BE #4597DB

Accessibility & contrast

On white

7.46
#1B588B on #FFFFFF
AA ✓AA large ✓AAA ✓

On black

2.82
#1B588B on #000000
AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B588B
7.46:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##1B588B#FFFFFF#000000##FFFFFF
##1B588B1.007.462.827.46
#FFFFFF7.461.0021.001.00
#0000002.8221.001.0021.00
##FFFFFF7.461.0021.001.00

Color blindness preview

Protanopia (red-blind)
#405B8D
Deuteranopia (green-blind)
#30508A
Tritanopia (blue-blind)
#00646B
Achromatopsia (no color)
#555555

Design tokens & code

CSS
--color: #1b588b;
/* rgb */ color: rgb(27, 88, 139);
/* oklch */ color: oklch(44.8% 0.104 248.1);
Tailwind
colors: {
  custom: {
    50: '#6a86ad',
    500: '#1b588b',
    950: '#000000',
  },
}
SCSS
$custom: #1b588b;
$custom-light: #6a86ad;
$custom-dark: #000000;
JSON
{
  "hex": "#1b588b",
  "rgb": {
    "r": 27,
    "g": 88,
    "b": 139
  },
  "hsl": {
    "h": 207.321,
    "s": 67.47,
    "l": 32.549
  },
  "oklch": {
    "l": 0.44843,
    "c": 0.10356,
    "h": 248.1
  },
  "luminance": 0.09077
}

Semantic roles & 50–950 ramp

primary
#1B588B
secondary
#BC7C45
accent
#8C3DEA
background
#F6F8FA
surface
#ECEFF4
border
#C7CACE
text
#070B10
muted
#7A7C7F

Preview Lab

Preview with #1B588B

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

Preview Lab → · Contrast checker → · Palette generator →

#1B588B Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva