#1B3751#1B3751

#1B3751 is a dark, muted cyan. Relative luminance 0.036; OKLCH L 32.8% C 0.058 H 248.3°. Best body text is #FFFFFF at 12.27:1 contrast (WCAG AA passes).

Color values

HEX	#1B3751
RGB	rgb(27, 55, 81)
HSL	hsl(209, 50%, 21%)
HSV	hsv(209, 67%, 32%)
CMYK	cmyk(66.7%, 32.1%, 0%, 68.2%)
CIE-LAB	lab(22.16, -1.31, -19.00)
CIE-LCH	lch(22.16, 19.04, 266.06°)
OKLab	oklab(32.81% -0.0213 -0.0535)
OKLCH	oklch(32.81% 0.058 248.3)
XYZ	xyz(3.3028, 3.5592, 8.2959)
Luminance	0.0356 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3751 #51351B

analogous

#1B5150 #1B3751 #1B1C51

triadic

#1B3751 #511B37 #37511B

tetradic

#1B3751 #501B51 #51351B #1C511B

square

#1B3751 #501B51 #51351B #1C511B

split-complementary

#1B3751 #511B1C #51501B

monochromatic

#081017 #0C1823 #1B3751 #2A567F #3A75AD

Accessibility & contrast

On white

12.27

#1B3751 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.71

#1B3751 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3751

12.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3751	#FFFFFF	#000000	##FFFFFF
##1B3751	1.00	12.27	1.71	12.27
#FFFFFF	12.27	1.00	21.00	1.00
#000000	1.71	21.00	1.00	21.00
##FFFFFF	12.27	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2C3852

Deuteranopia (green-blind)

#253350

Tritanopia (blue-blind)

#003D40

Achromatopsia (no color)

#353535

Design tokens & code

CSS

--color: #1b3751;
/* rgb */ color: rgb(27, 55, 81);
/* oklch */ color: oklch(32.8% 0.058 248.3);

Tailwind

colors: {
  custom: {
    50: '#5d6d82',
    500: '#1b3751',
    950: '#000000',
  },
}

SCSS

$custom: #1b3751;
$custom-light: #5d6d82;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3751",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 81
  },
  "hsl": {
    "h": 208.889,
    "s": 50,
    "l": 21.176
  },
  "oklch": {
    "l": 0.32806,
    "c": 0.05759,
    "h": 248.3
  },
  "luminance": 0.03559
}

Semantic roles & 50–950 ramp

primary

#1B3751

secondary

#876341

accent

#914EDA

background

#F5F6F7

surface

#E9EBEE

border

#C5C6C9

text

#04070A

muted

#797A7C

Preview Lab

Preview with #1B3751

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

Preview Lab → · Contrast checker → · Palette generator →