#1B178E#1B178E

#1B178E is a dark, vivid blue. Relative luminance 0.028; OKLCH L 32.3% C 0.183 H 271.1°. Best body text is #FFFFFF at 13.46:1 contrast (WCAG AA passes).

Color values

HEX	#1B178E
RGB	rgb(27, 23, 142)
HSL	hsl(242, 72%, 32%)
HSV	hsv(242, 84%, 56%)
CMYK	cmyk(81%, 83.8%, 0%, 44.3%)
CIE-LAB	lab(19.22, 43.22, -63.09)
CIE-LCH	lch(19.22, 76.47, 304.41°)
OKLab	oklab(32.25% 0.0035 -0.1826)
OKLCH	oklch(32.25% 0.183 271.1)
XYZ	xyz(5.6392, 2.7982, 25.8288)
Luminance	0.0280 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B178E #8A8E17

analogous

#174E8E #1B178E #57178E

triadic

#1B178E #8E1B17 #178E1B

tetradic

#1B178E #8E174E #8A8E17 #178E57

square

#1B178E #8E174E #8A8E17 #178E57

split-complementary

#1B178E #8E5717 #4E8E17

monochromatic

#070625 #110E59 #1B178E #2520C3 #453FE0

Accessibility & contrast

On white

13.46

#1B178E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.56

#1B178E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B178E

13.46:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B178E	#FFFFFF	#000000	##FFFFFF
##1B178E	1.00	13.46	1.56	13.46
#FFFFFF	13.46	1.00	21.00	1.00
#000000	1.56	21.00	1.00	21.00
##FFFFFF	13.46	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003491

Deuteranopia (green-blind)

#00288C

Tritanopia (blue-blind)

#003D54

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #1b178e;
/* rgb */ color: rgb(27, 23, 142);
/* oklch */ color: oklch(32.3% 0.183 271.1);

Tailwind

colors: {
  custom: {
    50: '#6f58b0',
    500: '#1b178e',
    950: '#000000',
  },
}

SCSS

$custom: #1b178e;
$custom-light: #6f58b0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b178e",
  "rgb": {
    "r": 27,
    "g": 23,
    "b": 142
  },
  "hsl": {
    "h": 242.017,
    "s": 72.121,
    "l": 32.353
  },
  "oklch": {
    "l": 0.32254,
    "c": 0.18262,
    "h": 271.1
  },
  "luminance": 0.02799
}

Semantic roles & 50–950 ramp

primary

#1B178E

secondary

#BCC040

accent

#EF39E9

background

#F7F5FB

surface

#EDE9F6

border

#C8C5D0

text

#090311

muted

#7B7880

Preview Lab

Preview with #1B178E

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

Preview Lab → · Contrast checker → · Palette generator →