#1B337C#1B337C

#1B337C is a dark, vivid blue. Relative luminance 0.041; OKLCH L 35.1% C 0.128 H 266.1°. Best body text is #FFFFFF at 11.59:1 contrast (WCAG AA passes).

Color values

HEX	#1B337C
RGB	rgb(27, 51, 124)
HSL	hsl(225, 64%, 30%)
HSV	hsv(225, 78%, 49%)
CMYK	cmyk(78.2%, 58.9%, 0%, 51.4%)
CIE-LAB	lab(23.85, 18.91, -44.16)
CIE-LCH	lch(23.85, 48.03, 293.18°)
OKLab	oklab(35.06% -0.0088 -0.1274)
OKLCH	oklch(35.06% 0.128 266.1)
XYZ	xyz(5.2726, 4.0553, 19.5697)
Luminance	0.0406 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B337C #7C641B

analogous

#1B637C #1B337C #341B7C

triadic

#1B337C #7C1B33 #337C1B

tetradic

#1B337C #7C1B63 #7C641B #1B7C34

square

#1B337C #7C1B63 #7C641B #1B7C34

split-complementary

#1B337C #7C341B #637C1B

monochromatic

#050A19 #101E4A #1B337C #2648AE #3D62D5

Accessibility & contrast

On white

11.59

#1B337C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#1B337C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B337C

11.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B337C	#FFFFFF	#000000	##FFFFFF
##1B337C	1.00	11.59	1.81	11.59
#FFFFFF	11.59	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003D7E

Deuteranopia (green-blind)

#00347B

Tritanopia (blue-blind)

#004552

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1b337c;
/* rgb */ color: rgb(27, 51, 124);
/* oklch */ color: oklch(35.1% 0.128 266.1);

Tailwind

colors: {
  custom: {
    50: '#676aa3',
    500: '#1b337c',
    950: '#000000',
  },
}

SCSS

$custom: #1b337c;
$custom-light: #676aa3;
$custom-dark: #000000;

JSON

{
  "hex": "#1b337c",
  "rgb": {
    "r": 27,
    "g": 51,
    "b": 124
  },
  "hsl": {
    "h": 225.155,
    "s": 64.238,
    "l": 29.608
  },
  "oklch": {
    "l": 0.35055,
    "c": 0.12769,
    "h": 266.1
  },
  "luminance": 0.04056
}

Semantic roles & 50–950 ramp

primary

#1B337C

secondary

#B09543

accent

#BE41E7

background

#F6F6FA

surface

#EBEBF4

border

#C6C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B337C

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

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