#1B5181#1B5181

#1B5181 is a dark, moderate cyan. Relative luminance 0.077; OKLCH L 42.5% C 0.098 H 249.1°. Best body text is #FFFFFF at 8.27:1 contrast (WCAG AA passes).

Color values

HEX	#1B5181
RGB	rgb(27, 81, 129)
HSL	hsl(208, 65%, 31%)
HSV	hsv(208, 79%, 51%)
CMYK	cmyk(79.1%, 37.2%, 0%, 49.4%)
CIE-LAB	lab(33.35, 0.34, -32.02)
CIE-LCH	lch(33.35, 32.02, 270.60°)
OKLab	oklab(42.48% -0.0347 -0.0912)
OKLCH	oklch(42.48% 0.098 249.1)
XYZ	xyz(7.3554, 7.7020, 21.8636)
Luminance	0.0770 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B5181 #814B1B

analogous

#1B817E #1B5181 #1B1E81

triadic

#1B5181 #811B51 #51811B

tetradic

#1B5181 #7E1B81 #814B1B #1E811B

square

#1B5181 #7E1B81 #814B1B #1E811B

split-complementary

#1B5181 #811B1E #817E1B

monochromatic

#06111C #10314E #1B5181 #2671B4 #3F90D7

Accessibility & contrast

On white

8.27

#1B5181 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.54

#1B5181 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B5181

8.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B5181	#FFFFFF	#000000	##FFFFFF
##1B5181	1.00	8.27	2.54	8.27
#FFFFFF	8.27	1.00	21.00	1.00
#000000	2.54	21.00	1.00	21.00
##FFFFFF	8.27	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3B5483

Deuteranopia (green-blind)

#2C4A80

Tritanopia (blue-blind)

#005C63

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #1b5181;
/* rgb */ color: rgb(27, 81, 129);
/* oklch */ color: oklch(42.5% 0.098 249.1);

Tailwind

colors: {
  custom: {
    50: '#6781a6',
    500: '#1b5181',
    950: '#000000',
  },
}

SCSS

$custom: #1b5181;
$custom-light: #6781a6;
$custom-dark: #000000;

JSON

{
  "hex": "#1b5181",
  "rgb": {
    "r": 27,
    "g": 81,
    "b": 129
  },
  "hsl": {
    "h": 208.235,
    "s": 65.385,
    "l": 30.588
  },
  "oklch": {
    "l": 0.4248,
    "c": 0.09755,
    "h": 249.1
  },
  "luminance": 0.07703
}

Semantic roles & 50–950 ramp

primary

#1B5181

secondary

#B57943

accent

#8F3FE8

background

#F6F7FA

surface

#EBEEF4

border

#C6C9CE

text

#070A0F

muted

#7A7C7F

Preview Lab

Preview with #1B5181

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

Preview Lab → · Contrast checker → · Palette generator →