#1B3A5C#1B3A5C

#1B3A5C is a dark, moderate cyan. Relative luminance 0.040; OKLCH L 34.3% C 0.070 H 252.4°. Best body text is #FFFFFF at 11.63:1 contrast (WCAG AA passes).

Color values

HEX	#1B3A5C
RGB	rgb(27, 58, 92)
HSL	hsl(211, 55%, 23%)
HSV	hsv(211, 71%, 36%)
CMYK	cmyk(70.7%, 37%, 0%, 63.9%)
CIE-LAB	lab(23.77, 0.95, -23.70)
CIE-LCH	lch(23.77, 23.72, 272.31°)
OKLab	oklab(34.28% -0.0213 -0.0672)
OKLCH	oklch(34.28% 0.07 252.4)
XYZ	xyz(3.8961, 4.0314, 10.6960)
Luminance	0.0403 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3A5C #5C3D1B

analogous

#1B5A5C #1B3A5C #1C1B5C

triadic

#1B3A5C #5C1B3A #3A5C1B

tetradic

#1B3A5C #5C1B5A #5C3D1B #1B5C1C

square

#1B3A5C #5C1B5A #5C3D1B #1B5C1C

split-complementary

#1B3A5C #5C1C1B #5A5C1B

monochromatic

#070F18 #0D1C2D #1B3A5C #29588B #3776BB

Accessibility & contrast

On white

11.63

#1B3A5C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#1B3A5C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3A5C

11.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3A5C	#FFFFFF	#000000	##FFFFFF
##1B3A5C	1.00	11.63	1.81	11.63
#FFFFFF	11.63	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2B3C5D

Deuteranopia (green-blind)

#22365B

Tritanopia (blue-blind)

#004246

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1b3a5c;
/* rgb */ color: rgb(27, 58, 92);
/* oklch */ color: oklch(34.3% 0.070 252.4);

Tailwind

colors: {
  custom: {
    50: '#5f6f8a',
    500: '#1b3a5c',
    950: '#000000',
  },
}

SCSS

$custom: #1b3a5c;
$custom-light: #5f6f8a;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3a5c",
  "rgb": {
    "r": 27,
    "g": 58,
    "b": 92
  },
  "hsl": {
    "h": 211.385,
    "s": 54.622,
    "l": 23.333
  },
  "oklch": {
    "l": 0.34276,
    "c": 0.07048,
    "h": 252.4
  },
  "luminance": 0.04032
}

Semantic roles & 50–950 ramp

primary

#1B3A5C

secondary

#926B41

accent

#974ADE

background

#F5F6F8

surface

#EAECF0

border

#C6C7CB

text

#05070B

muted

#797A7C

Preview Lab

Preview with #1B3A5C

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

Preview Lab → · Contrast checker → · Palette generator →