#1B4F5B#1B4F5B

#1B4F5B is a dark, muted cyan. Relative luminance 0.066; OKLCH L 39.9% C 0.058 H 215.8°. Best body text is #FFFFFF at 9.07:1 contrast (WCAG AA passes).

Color values

HEX	#1B4F5B
RGB	rgb(27, 79, 91)
HSL	hsl(191, 54%, 23%)
HSV	hsv(191, 70%, 36%)
CMYK	cmyk(70.3%, 13.2%, 0%, 64.3%)
CIE-LAB	lab(30.83, -12.83, -12.11)
CIE-LCH	lch(30.83, 17.64, 223.34°)
OKLab	oklab(39.86% -0.0467 -0.0337)
OKLCH	oklch(39.86% 0.058 215.8)
XYZ	xyz(5.1355, 6.5798, 10.8949)
Luminance	0.0658 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B4F5B #5B271B

analogous

#1B5B47 #1B4F5B #1B2F5B

triadic

#1B4F5B #5B1B4F #4F5B1B

tetradic

#1B4F5B #471B5B #5B271B #2F5B1B

square

#1B4F5B #471B5B #5B271B #2F5B1B

split-complementary

#1B4F5B #5B1B2F #5B471B

monochromatic

#071418 #0D262C #1B4F5B #29788A #37A1B9

Accessibility & contrast

On white

9.07

#1B4F5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.32

#1B4F5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B4F5B

9.07:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B4F5B	#FFFFFF	#000000	##FFFFFF
##1B4F5B	1.00	9.07	2.32	9.07
#FFFFFF	9.07	1.00	21.00	1.00
#000000	2.32	21.00	1.00	21.00
##FFFFFF	9.07	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#474C5C

Deuteranopia (green-blind)

#3E465B

Tritanopia (blue-blind)

#005353

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #1b4f5b;
/* rgb */ color: rgb(27, 79, 91);
/* oklch */ color: oklch(39.9% 0.058 215.8);

Tailwind

colors: {
  custom: {
    50: '#608089',
    500: '#1b4f5b',
    950: '#000000',
  },
}

SCSS

$custom: #1b4f5b;
$custom-light: #608089;
$custom-dark: #000000;

JSON

{
  "hex": "#1b4f5b",
  "rgb": {
    "r": 27,
    "g": 79,
    "b": 91
  },
  "hsl": {
    "h": 191.25,
    "s": 54.237,
    "l": 23.137
  },
  "oklch": {
    "l": 0.39863,
    "c": 0.05757,
    "h": 215.8
  },
  "luminance": 0.0658
}

Semantic roles & 50–950 ramp

primary

#1B4F5B

secondary

#915041

accent

#664ADE

background

#F6F7F8

surface

#EBEEF0

border

#C6C9CB

text

#050A0B

muted

#7A7C7C

Preview Lab

Preview with #1B4F5B

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

Preview Lab → · Contrast checker → · Palette generator →