#231B78#231B78

#231B78 is a dark, vivid blue. Relative luminance 0.025; OKLCH L 30.7% C 0.149 H 276.8°. Best body text is #FFFFFF at 14.01:1 contrast (WCAG AA passes).

Color values

HEX	#231B78
RGB	rgb(35, 27, 120)
HSL	hsl(245, 63%, 29%)
HSV	hsv(245, 78%, 47%)
CMYK	cmyk(70.8%, 77.5%, 0%, 52.9%)
CIE-LAB	lab(17.90, 34.39, -51.33)
CIE-LCH	lch(17.90, 61.79, 303.82°)
OKLab	oklab(30.72% 0.0177 -0.1483)
OKLCH	oklch(30.72% 0.149 276.8)
XYZ	xyz(4.4741, 2.4969, 18.0118)
Luminance	0.0250 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#231B78 #70781B

analogous

#1B4278 #231B78 #521B78

triadic

#231B78 #78231B #1B7823

tetradic

#231B78 #781B42 #70781B #1B7852

square

#231B78 #781B42 #70781B #1B7852

split-complementary

#231B78 #78521B #42781B

monochromatic

#070619 #141046 #231B78 #3226AA #483BD3

Accessibility & contrast

On white

14.01

#231B78 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.50

#231B78 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #231B78

14.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##231B78	#FFFFFF	#000000	##FFFFFF
##231B78	1.00	14.01	1.50	14.01
#FFFFFF	14.01	1.00	21.00	1.00
#000000	1.50	21.00	1.00	21.00
##FFFFFF	14.01	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00307B

Deuteranopia (green-blind)

#002876

Tritanopia (blue-blind)

#003648

Achromatopsia (no color)

#2C2C2C

Design tokens & code

CSS

--color: #231b78;
/* rgb */ color: rgb(35, 27, 120);
/* oklch */ color: oklch(30.7% 0.149 276.8);

Tailwind

colors: {
  custom: {
    50: '#6c59a0',
    500: '#231b78',
    950: '#000000',
  },
}

SCSS

$custom: #231b78;
$custom-light: #6c59a0;
$custom-dark: #000000;

JSON

{
  "hex": "#231b78",
  "rgb": {
    "r": 35,
    "g": 27,
    "b": 120
  },
  "hsl": {
    "h": 245.161,
    "s": 63.265,
    "l": 28.824
  },
  "oklch": {
    "l": 0.30718,
    "c": 0.14939,
    "h": 276.8
  },
  "luminance": 0.02497
}

Semantic roles & 50–950 ramp

primary

#231B78

secondary

#A3AC43

accent

#E641D8

background

#F6F5FA

surface

#ECE9F3

border

#C7C5CD

text

#08030F

muted

#7A787F

Preview Lab

Preview with #231B78

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

Preview Lab → · Contrast checker → · Palette generator →