#1B3753#1B3753

#1B3753 is a dark, moderate cyan. Relative luminance 0.036; OKLCH L 32.9% C 0.060 H 250.1°. Best body text is #FFFFFF at 12.22:1 contrast (WCAG AA passes).

Color values

HEX	#1B3753
RGB	rgb(27, 55, 83)
HSL	hsl(210, 51%, 22%)
HSV	hsv(210, 67%, 33%)
CMYK	cmyk(67.5%, 33.7%, 0%, 67.5%)
CIE-LAB	lab(22.27, -0.53, -20.16)
CIE-LCH	lch(22.27, 20.16, 268.49°)
OKLab	oklab(32.93% -0.0205 -0.0569)
OKLCH	oklch(32.93% 0.06 250.1)
XYZ	xyz(3.3789, 3.5896, 8.6967)
Luminance	0.0359 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3753 #53371B

analogous

#1B5353 #1B3753 #1B1B53

triadic

#1B3753 #531B37 #37531B

tetradic

#1B3753 #531B53 #53371B #1B531B

square

#1B3753 #531B53 #53371B #1B531B

split-complementary

#1B3753 #531B1B #53531B

monochromatic

#080F17 #0C1825 #1B3753 #2A5681 #3974AF

Accessibility & contrast

On white

12.22

#1B3753 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.72

#1B3753 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3753

12.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3753	#FFFFFF	#000000	##FFFFFF
##1B3753	1.00	12.22	1.72	12.22
#FFFFFF	12.22	1.00	21.00	1.00
#000000	1.72	21.00	1.00	21.00
##FFFFFF	12.22	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2B3854

Deuteranopia (green-blind)

#233352

Tritanopia (blue-blind)

#003E41

Achromatopsia (no color)

#353535

Design tokens & code

CSS

--color: #1b3753;
/* rgb */ color: rgb(27, 55, 83);
/* oklch */ color: oklch(32.9% 0.060 250.1);

Tailwind

colors: {
  custom: {
    50: '#5e6d83',
    500: '#1b3753',
    950: '#000000',
  },
}

SCSS

$custom: #1b3753;
$custom-light: #5e6d83;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3753",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 83
  },
  "hsl": {
    "h": 210,
    "s": 50.909,
    "l": 21.569
  },
  "oklch": {
    "l": 0.32927,
    "c": 0.06049,
    "h": 250.1
  },
  "luminance": 0.0359
}

Semantic roles & 50–950 ramp

primary

#1B3753

secondary

#896541

accent

#944DDA

background

#F5F6F8

surface

#E9EBEF

border

#C5C6CA

text

#05070A

muted

#797A7C

Preview Lab

Preview with #1B3753

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

Preview Lab → · Contrast checker → · Palette generator →