#1B337E#1B337E

#1B337E is a dark, vivid blue. Relative luminance 0.041; OKLCH L 35.2% C 0.131 H 266.2°. Best body text is #FFFFFF at 11.53:1 contrast (WCAG AA passes).

Color values

HEX	#1B337E
RGB	rgb(27, 51, 126)
HSL	hsl(225, 65%, 30%)
HSV	hsv(225, 79%, 49%)
CMYK	cmyk(78.6%, 59.5%, 0%, 50.6%)
CIE-LAB	lab(24.02, 19.72, -45.15)
CIE-LCH	lch(24.02, 49.27, 293.60°)
OKLab	oklab(35.23% -0.0086 -0.1303)
OKLCH	oklch(35.23% 0.131 266.2)
XYZ	xyz(5.4004, 4.1064, 20.2426)
Luminance	0.0411 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B337E #7E661B

analogous

#1B647E #1B337E #351B7E

triadic

#1B337E #7E1B33 #337E1B

tetradic

#1B337E #7E1B64 #7E661B #1B7E35

square

#1B337E #7E1B64 #7E661B #1B7E35

split-complementary

#1B337E #7E351B #647E1B

monochromatic

#050A19 #101F4C #1B337E #2647B0 #3E63D6

Accessibility & contrast

On white

11.53

#1B337E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.82

#1B337E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B337E

11.53:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B337E	#FFFFFF	#000000	##FFFFFF
##1B337E	1.00	11.53	1.82	11.53
#FFFFFF	11.53	1.00	21.00	1.00
#000000	1.82	21.00	1.00	21.00
##FFFFFF	11.53	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003E81

Deuteranopia (green-blind)

#00357D

Tritanopia (blue-blind)

#004653

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1b337e;
/* rgb */ color: rgb(27, 51, 126);
/* oklch */ color: oklch(35.2% 0.131 266.2);

Tailwind

colors: {
  custom: {
    50: '#686aa4',
    500: '#1b337e',
    950: '#000000',
  },
}

SCSS

$custom: #1b337e;
$custom-light: #686aa4;
$custom-dark: #000000;

JSON

{
  "hex": "#1b337e",
  "rgb": {
    "r": 27,
    "g": 51,
    "b": 126
  },
  "hsl": {
    "h": 225.455,
    "s": 64.706,
    "l": 30
  },
  "oklch": {
    "l": 0.35232,
    "c": 0.13059,
    "h": 266.2
  },
  "luminance": 0.04107
}

Semantic roles & 50–950 ramp

primary

#1B337E

secondary

#B29743

accent

#BF40E8

background

#F6F6FA

surface

#EBEBF4

border

#C6C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B337E

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

Preview Lab → · Contrast checker → · Palette generator →