#1B3757#1B3757

#1B3757 is a dark, moderate cyan. Relative luminance 0.037; OKLCH L 33.2% C 0.066 H 253.2°. Best body text is #FFFFFF at 12.13:1 contrast (WCAG AA passes).

Color values

HEX	#1B3757
RGB	rgb(27, 55, 87)
HSL	hsl(212, 53%, 22%)
HSV	hsv(212, 69%, 34%)
CMYK	cmyk(69%, 36.8%, 0%, 65.9%)
CIE-LAB	lab(22.49, 1.04, -22.45)
CIE-LCH	lch(22.49, 22.47, 272.65°)
OKLab	oklab(33.18% -0.0192 -0.0636)
OKLCH	oklch(33.18% 0.066 253.2)
XYZ	xyz(3.5379, 3.6532, 9.5337)
Luminance	0.0365 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3757 #573B1B

analogous

#1B5557 #1B3757 #1D1B57

triadic

#1B3757 #571B37 #37571B

tetradic

#1B3757 #571B55 #573B1B #1B571D

square

#1B3757 #571B55 #573B1B #1B571D

split-complementary

#1B3757 #571D1B #55571B

monochromatic

#070F17 #0D1928 #1B3757 #295586 #3872B4

Accessibility & contrast

On white

12.13

#1B3757 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.73

#1B3757 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3757

12.13:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3757	#FFFFFF	#000000	##FFFFFF
##1B3757	1.00	12.13	1.73	12.13
#FFFFFF	12.13	1.00	21.00	1.00
#000000	1.73	21.00	1.00	21.00
##FFFFFF	12.13	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#293958

Deuteranopia (green-blind)

#213356

Tritanopia (blue-blind)

#003E43

Achromatopsia (no color)

#363636

Design tokens & code

CSS

--color: #1b3757;
/* rgb */ color: rgb(27, 55, 87);
/* oklch */ color: oklch(33.2% 0.066 253.2);

Tailwind

colors: {
  custom: {
    50: '#5e6d86',
    500: '#1b3757',
    950: '#000000',
  },
}

SCSS

$custom: #1b3757;
$custom-light: #5e6d86;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3757",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 87
  },
  "hsl": {
    "h": 212,
    "s": 52.632,
    "l": 22.353
  },
  "oklch": {
    "l": 0.33176,
    "c": 0.06642,
    "h": 253.2
  },
  "luminance": 0.03654
}

Semantic roles & 50–950 ramp

primary

#1B3757

secondary

#8D6941

accent

#994CDC

background

#F5F6F8

surface

#E9EBEF

border

#C5C6CA

text

#05070B

muted

#797A7C

Preview Lab

Preview with #1B3757

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

Preview Lab → · Contrast checker → · Palette generator →