#1B128C#1B128C

#1B128C is a dark, vivid blue. Relative luminance 0.026; OKLCH L 31.5% C 0.184 H 271.6°. Best body text is #FFFFFF at 13.89:1 contrast (WCAG AA passes).

Color values

HEX	#1B128C
RGB	rgb(27, 18, 140)
HSL	hsl(244, 77%, 31%)
HSV	hsv(244, 87%, 55%)
CMYK	cmyk(80.7%, 87.1%, 0%, 45.1%)
CIE-LAB	lab(18.18, 44.89, -63.56)
CIE-LCH	lch(18.18, 77.81, 305.23°)
OKLab	oklab(31.47% 0.0051 -0.1839)
OKLCH	oklch(31.47% 0.184 271.6)
XYZ	xyz(5.4003, 2.5585, 25.0151)
Luminance	0.0256 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B128C #838C12

analogous

#12468C #1B128C #58128C

triadic

#1B128C #8C1B12 #128C1B

tetradic

#1B128C #8C1246 #838C12 #128C58

square

#1B128C #8C1246 #838C12 #128C58

split-complementary

#1B128C #8C5812 #468C12

monochromatic

#060420 #110B56 #1B128C #2519C2 #4134E5

Accessibility & contrast

On white

13.89

#1B128C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.51

#1B128C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B128C

13.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B128C	#FFFFFF	#000000	##FFFFFF
##1B128C	1.00	13.89	1.51	13.89
#FFFFFF	13.89	1.00	21.00	1.00
#000000	1.51	21.00	1.00	21.00
##FFFFFF	13.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00328F

Deuteranopia (green-blind)

#00268A

Tritanopia (blue-blind)

#003B52

Achromatopsia (no color)

#2C2C2C

Design tokens & code

CSS

--color: #1b128c;
/* rgb */ color: rgb(27, 18, 140);
/* oklch */ color: oklch(31.5% 0.184 271.6);

Tailwind

colors: {
  custom: {
    50: '#6f55af',
    500: '#1b128c',
    950: '#000000',
  },
}

SCSS

$custom: #1b128c;
$custom-light: #6f55af;
$custom-dark: #000000;

JSON

{
  "hex": "#1b128c",
  "rgb": {
    "r": 27,
    "g": 18,
    "b": 140
  },
  "hsl": {
    "h": 244.426,
    "s": 77.215,
    "l": 30.98
  },
  "oklch": {
    "l": 0.31467,
    "c": 0.18392,
    "h": 271.6
  },
  "luminance": 0.02559
}

Semantic roles & 50–950 ramp

primary

#1B128C

secondary

#B6C039

accent

#F434E6

background

#F7F5FA

surface

#EDE9F5

border

#C8C5CF

text

#090311

muted

#7B7880

Preview Lab

Preview with #1B128C

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

Preview Lab → · Contrast checker → · Palette generator →