#1B3758#1B3758

#1B3758 is a dark, moderate cyan. Relative luminance 0.037; OKLCH L 33.2% C 0.068 H 253.8°. Best body text is #FFFFFF at 12.11:1 contrast (WCAG AA passes).

Color values

HEX	#1B3758
RGB	rgb(27, 55, 88)
HSL	hsl(212, 53%, 23%)
HSV	hsv(212, 69%, 35%)
CMYK	cmyk(69.3%, 37.5%, 0%, 65.5%)
CIE-LAB	lab(22.55, 1.44, -23.02)
CIE-LCH	lch(22.55, 23.06, 273.57°)
OKLab	oklab(33.24% -0.0189 -0.0652)
OKLCH	oklch(33.24% 0.068 253.8)
XYZ	xyz(3.5790, 3.6696, 9.7503)
Luminance	0.0367 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3758 #583C1B

analogous

#1B5558 #1B3758 #1E1B58

triadic

#1B3758 #581B37 #37581B

tetradic

#1B3758 #581B55 #583C1B #1B581E

square

#1B3758 #581B55 #583C1B #1B581E

split-complementary

#1B3758 #581E1B #55581B

monochromatic

#070F17 #0D1A29 #1B3758 #295487 #3872B6

Accessibility & contrast

On white

12.11

#1B3758 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.73

#1B3758 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3758

12.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3758	#FFFFFF	#000000	##FFFFFF
##1B3758	1.00	12.11	1.73	12.11
#FFFFFF	12.11	1.00	21.00	1.00
#000000	1.73	21.00	1.00	21.00
##FFFFFF	12.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#293959

Deuteranopia (green-blind)

#203357

Tritanopia (blue-blind)

#003F43

Achromatopsia (no color)

#363636

Design tokens & code

CSS

--color: #1b3758;
/* rgb */ color: rgb(27, 55, 88);
/* oklch */ color: oklch(33.2% 0.068 253.8);

Tailwind

colors: {
  custom: {
    50: '#5f6d87',
    500: '#1b3758',
    950: '#000000',
  },
}

SCSS

$custom: #1b3758;
$custom-light: #5f6d87;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3758",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 88
  },
  "hsl": {
    "h": 212.459,
    "s": 53.043,
    "l": 22.549
  },
  "oklch": {
    "l": 0.3324,
    "c": 0.06791,
    "h": 253.8
  },
  "luminance": 0.0367
}

Semantic roles & 50–950 ramp

primary

#1B3758

secondary

#8E6B41

accent

#9A4BDC

background

#F5F6F8

surface

#E9EBEF

border

#C5C6CA

text

#05070B

muted

#797A7C

Preview Lab

Preview with #1B3758

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

Preview Lab → · Contrast checker → · Palette generator →