#1B337B#1B337B

#1B337B is a dark, vivid blue. Relative luminance 0.040; OKLCH L 35.0% C 0.126 H 266.0°. Best body text is #FFFFFF at 11.63:1 contrast (WCAG AA passes).

Color values

HEX	#1B337B
RGB	rgb(27, 51, 123)
HSL	hsl(225, 64%, 29%)
HSV	hsv(225, 78%, 48%)
CMYK	cmyk(78%, 58.5%, 0%, 51.8%)
CIE-LAB	lab(23.77, 18.50, -43.66)
CIE-LCH	lch(23.77, 47.42, 292.97°)
OKLab	oklab(34.97% -0.0088 -0.1259)
OKLCH	oklch(34.97% 0.126 266)
XYZ	xyz(5.2097, 4.0302, 19.2384)
Luminance	0.0403 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B337B #7B631B

analogous

#1B637B #1B337B #331B7B

triadic

#1B337B #7B1B33 #337B1B

tetradic

#1B337B #7B1B63 #7B631B #1B7B33

square

#1B337B #7B1B63 #7B631B #1B7B33

split-complementary

#1B337B #7B331B #637B1B

monochromatic

#060A19 #101E49 #1B337B #2648AD #3C62D4

Accessibility & contrast

On white

11.63

#1B337B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#1B337B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B337B

11.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B337B	#FFFFFF	#000000	##FFFFFF
##1B337B	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)

#003D7D

Deuteranopia (green-blind)

#00347A

Tritanopia (blue-blind)

#004551

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1b337b;
/* rgb */ color: rgb(27, 51, 123);
/* oklch */ color: oklch(35.0% 0.126 266.0);

Tailwind

colors: {
  custom: {
    50: '#676aa2',
    500: '#1b337b',
    950: '#000000',
  },
}

SCSS

$custom: #1b337b;
$custom-light: #676aa2;
$custom-dark: #000000;

JSON

{
  "hex": "#1b337b",
  "rgb": {
    "r": 27,
    "g": 51,
    "b": 123
  },
  "hsl": {
    "h": 225,
    "s": 64,
    "l": 29.412
  },
  "oklch": {
    "l": 0.34967,
    "c": 0.12623,
    "h": 266
  },
  "luminance": 0.04031
}

Semantic roles & 50–950 ramp

primary

#1B337B

secondary

#AF9443

accent

#BD41E7

background

#F6F6FA

surface

#EBEBF3

border

#C6C6CD

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B337B

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

Preview Lab → · Contrast checker → · Palette generator →