#1B3983#1B3983

#1B3983 is a dark, vivid blue. Relative luminance 0.048; OKLCH L 37.0% C 0.130 H 264.3°. Best body text is #FFFFFF at 10.72:1 contrast (WCAG AA passes).

Color values

HEX	#1B3983
RGB	rgb(27, 57, 131)
HSL	hsl(223, 66%, 31%)
HSV	hsv(223, 79%, 51%)
CMYK	cmyk(79.4%, 56.5%, 0%, 48.6%)
CIE-LAB	lab(26.15, 17.52, -44.83)
CIE-LCH	lch(26.15, 48.13, 291.35°)
OKLab	oklab(36.96% -0.0129 -0.1292)
OKLCH	oklch(36.96% 0.13 264.3)
XYZ	xyz(6.0104, 4.7973, 22.0775)
Luminance	0.0480 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3983 #83651B

analogous

#1B6D83 #1B3983 #311B83

triadic

#1B3983 #831B39 #39831B

tetradic

#1B3983 #831B6D #83651B #1B8331

square

#1B3983 #831B6D #83651B #1B8331

split-complementary

#1B3983 #83311B #6D831B

monochromatic

#060D1E #112350 #1B3983 #254FB6 #416CD8

Accessibility & contrast

On white

10.72

#1B3983 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.96

#1B3983 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3983

10.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3983	#FFFFFF	#000000	##FFFFFF
##1B3983	1.00	10.72	1.96	10.72
#FFFFFF	10.72	1.00	21.00	1.00
#000000	1.96	21.00	1.00	21.00
##FFFFFF	10.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004386

Deuteranopia (green-blind)

#003982

Tritanopia (blue-blind)

#004B58

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1b3983;
/* rgb */ color: rgb(27, 57, 131);
/* oklch */ color: oklch(37.0% 0.130 264.3);

Tailwind

colors: {
  custom: {
    50: '#696ea8',
    500: '#1b3983',
    950: '#000000',
  },
}

SCSS

$custom: #1b3983;
$custom-light: #696ea8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3983",
  "rgb": {
    "r": 27,
    "g": 57,
    "b": 131
  },
  "hsl": {
    "h": 222.692,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.36963,
    "c": 0.1299,
    "h": 264.3
  },
  "luminance": 0.04798
}

Semantic roles & 50–950 ramp

primary

#1B3983

secondary

#B69543

accent

#B83FE9

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #1B3983

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

Preview Lab → · Contrast checker → · Palette generator →