#1B2783#1B2783

#1B2783 is a dark, vivid blue. Relative luminance 0.033; OKLCH L 33.4% C 0.153 H 269.7°. Best body text is #FFFFFF at 12.62:1 contrast (WCAG AA passes).

Color values

HEX	#1B2783
RGB	rgb(27, 39, 131)
HSL	hsl(233, 66%, 31%)
HSV	hsv(233, 79%, 51%)
CMYK	cmyk(79.4%, 70.2%, 0%, 48.6%)
CIE-LAB	lab(21.29, 29.96, -52.77)
CIE-LCH	lch(21.29, 60.68, 299.59°)
OKLab	oklab(33.36% -0.0009 -0.1527)
OKLCH	oklch(33.36% 0.153 269.7)
XYZ	xyz(5.2728, 3.3222, 21.8317)
Luminance	0.0332 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B2783 #83771B

analogous

#1B5B83 #1B2783 #431B83

triadic

#1B2783 #831B27 #27831B

tetradic

#1B2783 #831B5B #83771B #1B8343

square

#1B2783 #831B5B #83771B #1B8343

split-complementary

#1B2783 #83431B #5B831B

monochromatic

#06091E #111850 #1B2783 #2536B6 #4152D8

Accessibility & contrast

On white

12.62

#1B2783 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.66

#1B2783 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B2783

12.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B2783	#FFFFFF	#000000	##FFFFFF
##1B2783	1.00	12.62	1.66	12.62
#FFFFFF	12.62	1.00	21.00	1.00
#000000	1.66	21.00	1.00	21.00
##FFFFFF	12.62	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003886

Deuteranopia (green-blind)

#002E81

Tritanopia (blue-blind)

#004051

Achromatopsia (no color)

#333333

Design tokens & code

CSS

--color: #1b2783;
/* rgb */ color: rgb(27, 39, 131);
/* oklch */ color: oklch(33.4% 0.153 269.7);

Tailwind

colors: {
  custom: {
    50: '#6a61a8',
    500: '#1b2783',
    950: '#000000',
  },
}

SCSS

$custom: #1b2783;
$custom-light: #6a61a8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b2783",
  "rgb": {
    "r": 27,
    "g": 39,
    "b": 131
  },
  "hsl": {
    "h": 233.077,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.33359,
    "c": 0.15274,
    "h": 269.7
  },
  "luminance": 0.03323
}

Semantic roles & 50–950 ramp

primary

#1B2783

secondary

#B6A943

accent

#D53FE9

background

#F6F5FA

surface

#ECEAF4

border

#C7C6CE

text

#080510

muted

#7A797F

Preview Lab

Preview with #1B2783

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

Preview Lab → · Contrast checker → · Palette generator →