#1B2183#1B2183

#1B2183 is a dark, vivid blue. Relative luminance 0.030; OKLCH L 32.3% C 0.160 H 270.8°. Best body text is #FFFFFF at 13.19:1 contrast (WCAG AA passes).

Color values

HEX	#1B2183
RGB	rgb(27, 33, 131)
HSL	hsl(237, 66%, 31%)
HSV	hsv(237, 79%, 51%)
CMYK	cmyk(79.4%, 74.8%, 0%, 48.6%)
CIE-LAB	lab(19.88, 33.83, -55.09)
CIE-LCH	lch(19.88, 64.65, 301.55°)
OKLab	oklab(32.34% 0.0022 -0.1595)
OKLCH	oklch(32.34% 0.16 270.8)
XYZ	xyz(5.0912, 2.9589, 21.7711)
Luminance	0.0296 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B2183 #837D1B

analogous

#1B5583 #1B2183 #491B83

triadic

#1B2183 #831B21 #21831B

tetradic

#1B2183 #831B55 #837D1B #1B8349

square

#1B2183 #831B55 #837D1B #1B8349

split-complementary

#1B2183 #83491B #55831B

monochromatic

#06071E #111450 #1B2183 #252EB6 #4149D8

Accessibility & contrast

On white

13.19

#1B2183 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.59

#1B2183 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B2183

13.19:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B2183	#FFFFFF	#000000	##FFFFFF
##1B2183	1.00	13.19	1.59	13.19
#FFFFFF	13.19	1.00	21.00	1.00
#000000	1.59	21.00	1.00	21.00
##FFFFFF	13.19	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003586

Deuteranopia (green-blind)

#002B81

Tritanopia (blue-blind)

#003D50

Achromatopsia (no color)

#303030

Design tokens & code

CSS

--color: #1b2183;
/* rgb */ color: rgb(27, 33, 131);
/* oklch */ color: oklch(32.3% 0.160 270.8);

Tailwind

colors: {
  custom: {
    50: '#6b5da8',
    500: '#1b2183',
    950: '#000000',
  },
}

SCSS

$custom: #1b2183;
$custom-light: #6b5da8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b2183",
  "rgb": {
    "r": 27,
    "g": 33,
    "b": 131
  },
  "hsl": {
    "h": 236.538,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.32342,
    "c": 0.15953,
    "h": 270.8
  },
  "luminance": 0.02959
}

Semantic roles & 50–950 ramp

primary

#1B2183

secondary

#B6B043

accent

#DF3FE9

background

#F7F5FA

surface

#EDE9F4

border

#C8C5CE

text

#080410

muted

#7B797F

Preview Lab

Preview with #1B2183

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

Preview Lab → · Contrast checker → · Palette generator →