#1B178A#1B178A

#1B178A is a dark, vivid blue. Relative luminance 0.027; OKLCH L 31.8% C 0.178 H 271.4°. Best body text is #FFFFFF at 13.67:1 contrast (WCAG AA passes).

Color values

HEX	#1B178A
RGB	rgb(27, 23, 138)
HSL	hsl(242, 71%, 32%)
HSV	hsv(242, 83%, 54%)
CMYK	cmyk(80.4%, 83.3%, 0%, 45.9%)
CIE-LAB	lab(18.71, 41.92, -61.42)
CIE-LCH	lch(18.71, 74.36, 304.31°)
OKLab	oklab(31.76% 0.0044 -0.1778)
OKLCH	oklch(31.76% 0.178 271.4)
XYZ	xyz(5.3443, 2.6802, 24.2755)
Luminance	0.0268 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B178A #868A17

analogous

#174D8A #1B178A #55178A

triadic

#1B178A #8A1B17 #178A1B

tetradic

#1B178A #8A174D #868A17 #178A55

square

#1B178A #8A174D #868A17 #178A55

split-complementary

#1B178A #8A5517 #4D8A17

monochromatic

#060621 #110E56 #1B178A #2520BE #423DDF

Accessibility & contrast

On white

13.67

#1B178A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.54

#1B178A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B178A

13.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B178A	#FFFFFF	#000000	##FFFFFF
##1B178A	1.00	13.67	1.54	13.67
#FFFFFF	13.67	1.00	21.00	1.00
#000000	1.54	21.00	1.00	21.00
##FFFFFF	13.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00338D

Deuteranopia (green-blind)

#002888

Tritanopia (blue-blind)

#003C51

Achromatopsia (no color)

#2E2E2E

Design tokens & code

CSS

--color: #1b178a;
/* rgb */ color: rgb(27, 23, 138);
/* oklch */ color: oklch(31.8% 0.178 271.4);

Tailwind

colors: {
  custom: {
    50: '#6e57ad',
    500: '#1b178a',
    950: '#000000',
  },
}

SCSS

$custom: #1b178a;
$custom-light: #6e57ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1b178a",
  "rgb": {
    "r": 27,
    "g": 23,
    "b": 138
  },
  "hsl": {
    "h": 242.087,
    "s": 71.429,
    "l": 31.569
  },
  "oklch": {
    "l": 0.31762,
    "c": 0.17782,
    "h": 271.4
  },
  "luminance": 0.02681
}

Semantic roles & 50–950 ramp

primary

#1B178A

secondary

#B9BE3F

accent

#EE3AE8

background

#F7F5FA

surface

#EDE9F4

border

#C8C5CE

text

#090310

muted

#7B787F

Preview Lab

Preview with #1B178A

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

Preview Lab → · Contrast checker → · Palette generator →