#1B178D#1B178D

#1B178D is a dark, vivid blue. Relative luminance 0.028; OKLCH L 32.1% C 0.181 H 271.2°. Best body text is #FFFFFF at 13.52:1 contrast (WCAG AA passes).

Color values

HEX	#1B178D
RGB	rgb(27, 23, 141)
HSL	hsl(242, 72%, 32%)
HSV	hsv(242, 84%, 55%)
CMYK	cmyk(80.9%, 83.7%, 0%, 44.7%)
CIE-LAB	lab(19.09, 42.89, -62.67)
CIE-LCH	lch(19.09, 75.95, 304.39°)
OKLab	oklab(32.13% 0.0037 -0.1814)
OKLCH	oklch(32.13% 0.181 271.2)
XYZ	xyz(5.5645, 2.7683, 25.4352)
Luminance	0.0277 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B178D #898D17

analogous

#174E8D #1B178D #56178D

triadic

#1B178D #8D1B17 #178D1B

tetradic

#1B178D #8D174E #898D17 #178D56

square

#1B178D #8D174E #898D17 #178D56

split-complementary

#1B178D #8D5617 #4E8D17

monochromatic

#070624 #110E58 #1B178D #2520C2 #443FE0

Accessibility & contrast

On white

13.52

#1B178D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.55

#1B178D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B178D

13.52:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B178D	#FFFFFF	#000000	##FFFFFF
##1B178D	1.00	13.52	1.55	13.52
#FFFFFF	13.52	1.00	21.00	1.00
#000000	1.55	21.00	1.00	21.00
##FFFFFF	13.52	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003490

Deuteranopia (green-blind)

#00288B

Tritanopia (blue-blind)

#003D53

Achromatopsia (no color)

#2E2E2E

Design tokens & code

CSS

--color: #1b178d;
/* rgb */ color: rgb(27, 23, 141);
/* oklch */ color: oklch(32.1% 0.181 271.2);

Tailwind

colors: {
  custom: {
    50: '#6f58b0',
    500: '#1b178d',
    950: '#000000',
  },
}

SCSS

$custom: #1b178d;
$custom-light: #6f58b0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b178d",
  "rgb": {
    "r": 27,
    "g": 23,
    "b": 141
  },
  "hsl": {
    "h": 242.034,
    "s": 71.951,
    "l": 32.157
  },
  "oklch": {
    "l": 0.32131,
    "c": 0.18143,
    "h": 271.2
  },
  "luminance": 0.02769
}

Semantic roles & 50–950 ramp

primary

#1B178D

secondary

#BCC040

accent

#EF39E9

background

#F7F5FB

surface

#EDE9F6

border

#C8C5D0

text

#090311

muted

#7B7880

Preview Lab

Preview with #1B178D

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

Preview Lab → · Contrast checker → · Palette generator →