#1B3989#1B3989

#1B3989 is a dark, vivid blue. Relative luminance 0.050; OKLCH L 37.5% C 0.139 H 264.8°. Best body text is #FFFFFF at 10.54:1 contrast (WCAG AA passes).

Color values

HEX	#1B3989
RGB	rgb(27, 57, 137)
HSL	hsl(224, 67%, 32%)
HSV	hsv(224, 80%, 54%)
CMYK	cmyk(80.3%, 58.4%, 0%, 46.3%)
CIE-LAB	lab(26.63, 19.95, -47.78)
CIE-LCH	lch(26.63, 51.78, 292.67°)
OKLab	oklab(37.48% -0.0125 -0.1379)
OKLCH	oklch(37.48% 0.139 264.8)
XYZ	xyz(6.4289, 4.9647, 24.2815)
Luminance	0.0496 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3989 #896B1B

analogous

#1B7089 #1B3989 #341B89

triadic

#1B3989 #891B39 #39891B

tetradic

#1B3989 #891B70 #896B1B #1B8934

square

#1B3989 #891B70 #896B1B #1B8934

split-complementary

#1B3989 #89341B #70891B

monochromatic

#070E23 #112456 #1B3989 #254EBC #446DDA

Accessibility & contrast

On white

10.54

#1B3989 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.99

#1B3989 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3989

10.54:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3989	#FFFFFF	#000000	##FFFFFF
##1B3989	1.00	10.54	1.99	10.54
#FFFFFF	10.54	1.00	21.00	1.00
#000000	1.99	21.00	1.00	21.00
##FFFFFF	10.54	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00448C

Deuteranopia (green-blind)

#003A87

Tritanopia (blue-blind)

#004D5B

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1b3989;
/* rgb */ color: rgb(27, 57, 137);
/* oklch */ color: oklch(37.5% 0.139 264.8);

Tailwind

colors: {
  custom: {
    50: '#6a6eac',
    500: '#1b3989',
    950: '#000000',
  },
}

SCSS

$custom: #1b3989;
$custom-light: #6a6eac;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3989",
  "rgb": {
    "r": 27,
    "g": 57,
    "b": 137
  },
  "hsl": {
    "h": 223.636,
    "s": 67.073,
    "l": 32.157
  },
  "oklch": {
    "l": 0.37481,
    "c": 0.1385,
    "h": 264.8
  },
  "luminance": 0.04965
}

Semantic roles & 50–950 ramp

primary

#1B3989

secondary

#BC9B44

accent

#BB3EEA

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #1B3989

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

Preview Lab → · Contrast checker → · Palette generator →