#1B4564#1B4564

#1B4564 is a dark, moderate cyan. Relative luminance 0.054; OKLCH L 37.6% C 0.071 H 243.7°. Best body text is #FFFFFF at 10.09:1 contrast (WCAG AA passes).

Color values

HEX	#1B4564
RGB	rgb(27, 69, 100)
HSL	hsl(205, 57%, 25%)
HSV	hsv(205, 73%, 39%)
CMYK	cmyk(73%, 31%, 0%, 60.8%)
CIE-LAB	lab(27.87, -3.26, -22.44)
CIE-LCH	lch(27.87, 22.68, 261.73°)
OKLab	oklab(37.64% -0.0313 -0.0634)
OKLCH	oklch(37.64% 0.071 243.7)
XYZ	xyz(4.8795, 5.4088, 12.8410)
Luminance	0.0541 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B4564 #643A1B

analogous

#1B645E #1B4564 #1B2164

triadic

#1B4564 #641B45 #45641B

tetradic

#1B4564 #5E1B64 #643A1B #21641B

square

#1B4564 #5E1B64 #643A1B #21641B

split-complementary

#1B4564 #641B21 #645E1B

monochromatic

#071118 #0E2434 #1B4564 #286694 #3588C4

Accessibility & contrast

On white

10.09

#1B4564 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.08

#1B4564 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B4564

10.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B4564	#FFFFFF	#000000	##FFFFFF
##1B4564	1.00	10.09	2.08	10.09
#FFFFFF	10.09	1.00	21.00	1.00
#000000	2.08	21.00	1.00	21.00
##FFFFFF	10.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#374665

Deuteranopia (green-blind)

#2D3F63

Tritanopia (blue-blind)

#004D50

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #1b4564;
/* rgb */ color: rgb(27, 69, 100);
/* oklch */ color: oklch(37.6% 0.071 243.7);

Tailwind

colors: {
  custom: {
    50: '#617890',
    500: '#1b4564',
    950: '#000000',
  },
}

SCSS

$custom: #1b4564;
$custom-light: #617890;
$custom-dark: #000000;

JSON

{
  "hex": "#1b4564",
  "rgb": {
    "r": 27,
    "g": 69,
    "b": 100
  },
  "hsl": {
    "h": 205.479,
    "s": 57.48,
    "l": 24.902
  },
  "oklch": {
    "l": 0.37641,
    "c": 0.0707,
    "h": 243.7
  },
  "luminance": 0.05409
}

Semantic roles & 50–950 ramp

primary

#1B4564

secondary

#996741

accent

#8847E1

background

#F6F7F8

surface

#EBEDF0

border

#C6C8CB

text

#05090C

muted

#7A7B7D

Preview Lab

Preview with #1B4564

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

Preview Lab → · Contrast checker → · Palette generator →