#1B188F#1B188F

#1B188F is a dark, vivid blue. Relative luminance 0.029; OKLCH L 32.5% C 0.183 H 270.9°. Best body text is #FFFFFF at 13.34:1 contrast (WCAG AA passes).

Color values

HEX	#1B188F
RGB	rgb(27, 24, 143)
HSL	hsl(242, 71%, 33%)
HSV	hsv(242, 83%, 56%)
CMYK	cmyk(81.1%, 83.2%, 0%, 43.9%)
CIE-LAB	lab(19.51, 43.05, -63.22)
CIE-LCH	lch(19.51, 76.49, 304.25°)
OKLab	oklab(32.49% 0.003 -0.183)
OKLCH	oklch(32.49% 0.183 270.9)
XYZ	xyz(5.7349, 2.8688, 26.2328)
Luminance	0.0287 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B188F #8C8F18

analogous

#18508F #1B188F #57188F

triadic

#1B188F #8F1B18 #188F1B

tetradic

#1B188F #8F1850 #8C8F18 #188F57

square

#1B188F #8F1850 #8C8F18 #188F57

split-complementary

#1B188F #8F5718 #508F18

monochromatic

#070626 #110F5B #1B188F #2521C3 #4642DF

Accessibility & contrast

On white

13.34

#1B188F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.57

#1B188F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B188F

13.34:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B188F	#FFFFFF	#000000	##FFFFFF
##1B188F	1.00	13.34	1.57	13.34
#FFFFFF	13.34	1.00	21.00	1.00
#000000	1.57	21.00	1.00	21.00
##FFFFFF	13.34	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003592

Deuteranopia (green-blind)

#00298D

Tritanopia (blue-blind)

#003E55

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #1b188f;
/* rgb */ color: rgb(27, 24, 143);
/* oklch */ color: oklch(32.5% 0.183 270.9);

Tailwind

colors: {
  custom: {
    50: '#6f58b1',
    500: '#1b188f',
    950: '#000000',
  },
}

SCSS

$custom: #1b188f;
$custom-light: #6f58b1;
$custom-dark: #000000;

JSON

{
  "hex": "#1b188f",
  "rgb": {
    "r": 27,
    "g": 24,
    "b": 143
  },
  "hsl": {
    "h": 241.513,
    "s": 71.257,
    "l": 32.745
  },
  "oklch": {
    "l": 0.32494,
    "c": 0.18303,
    "h": 270.9
  },
  "luminance": 0.02869
}

Semantic roles & 50–950 ramp

primary

#1B188F

secondary

#BDC043

accent

#EE3AE9

background

#F7F5FB

surface

#EDE9F6

border

#C8C5D0

text

#090311

muted

#7B7880

Preview Lab

Preview with #1B188F

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

Preview Lab → · Contrast checker → · Palette generator →