#1B355B#1B355B

#1B355B is a dark, moderate blue. Relative luminance 0.035; OKLCH L 32.9% C 0.075 H 257.9°. Best body text is #FFFFFF at 12.30:1 contrast (WCAG AA passes).

Color values

HEX	#1B355B
RGB	rgb(27, 53, 91)
HSL	hsl(216, 54%, 23%)
HSV	hsv(216, 70%, 36%)
CMYK	cmyk(70.3%, 41.8%, 0%, 64.3%)
CIE-LAB	lab(22.07, 4.03, -25.75)
CIE-LCH	lch(22.07, 26.07, 278.89°)
OKLab	oklab(32.92% -0.0157 -0.0732)
OKLCH	oklch(32.92% 0.075 257.9)
XYZ	xyz(3.6127, 3.5342, 10.3873)
Luminance	0.0353 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B355B #5B411B

analogous

#1B555B #1B355B #211B5B

triadic

#1B355B #5B1B35 #355B1B

tetradic

#1B355B #5B1B55 #5B411B #1B5B21

square

#1B355B #5B1B55 #5B411B #1B5B21

split-complementary

#1B355B #5B211B #555B1B

monochromatic

#070E18 #0D1A2C #1B355B #29508A #376CB9

Accessibility & contrast

On white

12.30

#1B355B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.71

#1B355B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B355B

12.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B355B	#FFFFFF	#000000	##FFFFFF
##1B355B	1.00	12.30	1.71	12.30
#FFFFFF	12.30	1.00	21.00	1.00
#000000	1.71	21.00	1.00	21.00
##FFFFFF	12.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#24385D

Deuteranopia (green-blind)

#1B325A

Tritanopia (blue-blind)

#003E43

Achromatopsia (no color)

#353535

Design tokens & code

CSS

--color: #1b355b;
/* rgb */ color: rgb(27, 53, 91);
/* oklch */ color: oklch(32.9% 0.075 257.9);

Tailwind

colors: {
  custom: {
    50: '#5f6b89',
    500: '#1b355b',
    950: '#000000',
  },
}

SCSS

$custom: #1b355b;
$custom-light: #5f6b89;
$custom-dark: #000000;

JSON

{
  "hex": "#1b355b",
  "rgb": {
    "r": 27,
    "g": 53,
    "b": 91
  },
  "hsl": {
    "h": 215.625,
    "s": 54.237,
    "l": 23.137
  },
  "oklch": {
    "l": 0.32925,
    "c": 0.07492,
    "h": 257.9
  },
  "luminance": 0.03535
}

Semantic roles & 50–950 ramp

primary

#1B355B

secondary

#917041

accent

#A24ADE

background

#F5F6F8

surface

#EAEBF0

border

#C6C6CB

text

#05060B

muted

#797A7C

Preview Lab

Preview with #1B355B

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

Preview Lab → · Contrast checker → · Palette generator →