#1B5381#1B5381

#1B5381 is a dark, moderate cyan. Relative luminance 0.080; OKLCH L 43.0% C 0.096 H 247.4°. Best body text is #FFFFFF at 8.07:1 contrast (WCAG AA passes).

Color values

HEX	#1B5381
RGB	rgb(27, 83, 129)
HSL	hsl(207, 65%, 31%)
HSV	hsv(207, 79%, 51%)
CMYK	cmyk(79.1%, 35.7%, 0%, 49.4%)
CIE-LAB	lab(33.99, -0.96, -31.02)
CIE-LCH	lch(33.99, 31.03, 268.23°)
OKLab	oklab(42.98% -0.0367 -0.0882)
OKLCH	oklch(42.98% 0.096 247.4)
XYZ	xyz(7.5062, 8.0036, 21.9139)
Luminance	0.0800 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B5381 #81491B

analogous

#1B817C #1B5381 #1B2081

triadic

#1B5381 #811B53 #53811B

tetradic

#1B5381 #7C1B81 #81491B #20811B

square

#1B5381 #7C1B81 #81491B #20811B

split-complementary

#1B5381 #811B20 #817C1B

monochromatic

#06121C #10324E #1B5381 #2674B4 #3F93D7

Accessibility & contrast

On white

8.07

#1B5381 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.60

#1B5381 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B5381

8.07:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B5381	#FFFFFF	#000000	##FFFFFF
##1B5381	1.00	8.07	2.60	8.07
#FFFFFF	8.07	1.00	21.00	1.00
#000000	2.60	21.00	1.00	21.00
##FFFFFF	8.07	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3E5583

Deuteranopia (green-blind)

#2F4C80

Tritanopia (blue-blind)

#005E64

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #1b5381;
/* rgb */ color: rgb(27, 83, 129);
/* oklch */ color: oklch(43.0% 0.096 247.4);

Tailwind

colors: {
  custom: {
    50: '#6883a6',
    500: '#1b5381',
    950: '#000000',
  },
}

SCSS

$custom: #1b5381;
$custom-light: #6883a6;
$custom-dark: #000000;

JSON

{
  "hex": "#1b5381",
  "rgb": {
    "r": 27,
    "g": 83,
    "b": 129
  },
  "hsl": {
    "h": 207.059,
    "s": 65.385,
    "l": 30.588
  },
  "oklch": {
    "l": 0.4298,
    "c": 0.09551,
    "h": 247.4
  },
  "luminance": 0.08005
}

Semantic roles & 50–950 ramp

primary

#1B5381

secondary

#B57643

accent

#8C3FE8

background

#F6F7FA

surface

#EBEEF4

border

#C6C9CE

text

#070A0F

muted

#7A7C7F

Preview Lab

Preview with #1B5381

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

Preview Lab → · Contrast checker → · Palette generator →