#1B178F#1B178F

#1B178F is a dark, vivid blue. Relative luminance 0.028; OKLCH L 32.4% C 0.184 H 271.0°. Best body text is #FFFFFF at 13.41:1 contrast (WCAG AA passes).

Color values

HEX	#1B178F
RGB	rgb(27, 23, 143)
HSL	hsl(242, 72%, 33%)
HSV	hsv(242, 84%, 56%)
CMYK	cmyk(81.1%, 83.9%, 0%, 43.9%)
CIE-LAB	lab(19.34, 43.54, -63.50)
CIE-LCH	lch(19.34, 76.99, 304.44°)
OKLab	oklab(32.38% 0.0032 -0.1838)
OKLCH	oklch(32.38% 0.184 271)
XYZ	xyz(5.7146, 2.8283, 26.2260)
Luminance	0.0283 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B178F #8B8F17

analogous

#174F8F #1B178F #57178F

triadic

#1B178F #8F1B17 #178F1B

tetradic

#1B178F #8F174F #8B8F17 #178F57

square

#1B178F #8F174F #8B8F17 #178F57

split-complementary

#1B178F #8F5717 #4F8F17

monochromatic

#070626 #110F5A #1B178F #251FC4 #4540E0

Accessibility & contrast

On white

13.41

#1B178F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.57

#1B178F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B178F

13.41:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B178F	#FFFFFF	#000000	##FFFFFF
##1B178F	1.00	13.41	1.57	13.41
#FFFFFF	13.41	1.00	21.00	1.00
#000000	1.57	21.00	1.00	21.00
##FFFFFF	13.41	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003592

Deuteranopia (green-blind)

#00298D

Tritanopia (blue-blind)

#003E54

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #1b178f;
/* rgb */ color: rgb(27, 23, 143);
/* oklch */ color: oklch(32.4% 0.184 271.0);

Tailwind

colors: {
  custom: {
    50: '#6f58b1',
    500: '#1b178f',
    950: '#000000',
  },
}

SCSS

$custom: #1b178f;
$custom-light: #6f58b1;
$custom-dark: #000000;

JSON

{
  "hex": "#1b178f",
  "rgb": {
    "r": 27,
    "g": 23,
    "b": 143
  },
  "hsl": {
    "h": 242,
    "s": 72.289,
    "l": 32.549
  },
  "oklch": {
    "l": 0.32378,
    "c": 0.18382,
    "h": 271
  },
  "luminance": 0.02829
}

Semantic roles & 50–950 ramp

primary

#1B178F

secondary

#BCC141

accent

#EF39E9

background

#F7F5FB

surface

#EDE9F6

border

#C8C5D0

text

#090311

muted

#7B7880

Preview Lab

Preview with #1B178F

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

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