#1B337D#1B337D

#1B337D is a dark, vivid blue. Relative luminance 0.041; OKLCH L 35.1% C 0.129 H 266.1°. Best body text is #FFFFFF at 11.56:1 contrast (WCAG AA passes).

Color values

HEX	#1B337D
RGB	rgb(27, 51, 125)
HSL	hsl(225, 64%, 30%)
HSV	hsv(225, 78%, 49%)
CMYK	cmyk(78.4%, 59.2%, 0%, 51%)
CIE-LAB	lab(23.94, 19.32, -44.65)
CIE-LCH	lch(23.94, 48.65, 293.39°)
OKLab	oklab(35.14% -0.0087 -0.1288)
OKLCH	oklch(35.14% 0.129 266.1)
XYZ	xyz(5.3362, 4.0807, 19.9045)
Luminance	0.0408 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B337D #7D651B

analogous

#1B647D #1B337D #341B7D

triadic

#1B337D #7D1B33 #337D1B

tetradic

#1B337D #7D1B64 #7D651B #1B7D34

square

#1B337D #7D1B64 #7D651B #1B7D34

split-complementary

#1B337D #7D341B #647D1B

monochromatic

#050A19 #101E4B #1B337D #2648AF #3D62D5

Accessibility & contrast

On white

11.56

#1B337D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.82

#1B337D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B337D

11.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B337D	#FFFFFF	#000000	##FFFFFF
##1B337D	1.00	11.56	1.82	11.56
#FFFFFF	11.56	1.00	21.00	1.00
#000000	1.82	21.00	1.00	21.00
##FFFFFF	11.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003E80

Deuteranopia (green-blind)

#00357C

Tritanopia (blue-blind)

#004552

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1b337d;
/* rgb */ color: rgb(27, 51, 125);
/* oklch */ color: oklch(35.1% 0.129 266.1);

Tailwind

colors: {
  custom: {
    50: '#686aa3',
    500: '#1b337d',
    950: '#000000',
  },
}

SCSS

$custom: #1b337d;
$custom-light: #686aa3;
$custom-dark: #000000;

JSON

{
  "hex": "#1b337d",
  "rgb": {
    "r": 27,
    "g": 51,
    "b": 125
  },
  "hsl": {
    "h": 225.306,
    "s": 64.474,
    "l": 29.804
  },
  "oklch": {
    "l": 0.35143,
    "c": 0.12914,
    "h": 266.1
  },
  "luminance": 0.04081
}

Semantic roles & 50–950 ramp

primary

#1B337D

secondary

#B19643

accent

#BF40E7

background

#F6F6FA

surface

#EBEBF4

border

#C6C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B337D

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

Preview Lab → · Contrast checker → · Palette generator →