#1B3759#1B3759

#1B3759 is a dark, moderate cyan. Relative luminance 0.037; OKLCH L 33.3% C 0.069 H 254.4°. Best body text is #FFFFFF at 12.09:1 contrast (WCAG AA passes).

Color values

HEX	#1B3759
RGB	rgb(27, 55, 89)
HSL	hsl(213, 53%, 23%)
HSV	hsv(213, 70%, 35%)
CMYK	cmyk(69.7%, 38.2%, 0%, 65.1%)
CIE-LAB	lab(22.61, 1.83, -23.58)
CIE-LCH	lch(22.61, 23.65, 274.44°)
OKLab	oklab(33.31% -0.0186 -0.0669)
OKLCH	oklch(33.31% 0.069 254.4)
XYZ	xyz(3.6207, 3.6863, 9.9700)
Luminance	0.0369 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3759 #593D1B

analogous

#1B5659 #1B3759 #1E1B59

triadic

#1B3759 #591B37 #37591B

tetradic

#1B3759 #591B56 #593D1B #1B591E

square

#1B3759 #591B56 #593D1B #1B591E

split-complementary

#1B3759 #591E1B #56591B

monochromatic

#070F17 #0D1A2A #1B3759 #295488 #3771B7

Accessibility & contrast

On white

12.09

#1B3759 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.74

#1B3759 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3759

12.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3759	#FFFFFF	#000000	##FFFFFF
##1B3759	1.00	12.09	1.74	12.09
#FFFFFF	12.09	1.00	21.00	1.00
#000000	1.74	21.00	1.00	21.00
##FFFFFF	12.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#28395A

Deuteranopia (green-blind)

#203358

Tritanopia (blue-blind)

#003F43

Achromatopsia (no color)

#363636

Design tokens & code

CSS

--color: #1b3759;
/* rgb */ color: rgb(27, 55, 89);
/* oklch */ color: oklch(33.3% 0.069 254.4);

Tailwind

colors: {
  custom: {
    50: '#5f6d88',
    500: '#1b3759',
    950: '#000000',
  },
}

SCSS

$custom: #1b3759;
$custom-light: #5f6d88;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3759",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 89
  },
  "hsl": {
    "h": 212.903,
    "s": 53.448,
    "l": 22.745
  },
  "oklch": {
    "l": 0.33305,
    "c": 0.06943,
    "h": 254.4
  },
  "luminance": 0.03687
}

Semantic roles & 50–950 ramp

primary

#1B3759

secondary

#8F6C41

accent

#9B4BDD

background

#F5F6F8

surface

#EAEBEF

border

#C6C6CA

text

#05070B

muted

#797A7C

Preview Lab

Preview with #1B3759

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

Preview Lab → · Contrast checker → · Palette generator →