#231B81#231B81

#231B81 is a dark, vivid blue. Relative luminance 0.027; OKLCH L 31.7% C 0.161 H 275.5°. Best body text is #FFFFFF at 13.59:1 contrast (WCAG AA passes).

Color values

HEX	#231B81
RGB	rgb(35, 27, 129)
HSL	hsl(245, 65%, 31%)
HSV	hsv(245, 79%, 51%)
CMYK	cmyk(72.9%, 79.1%, 0%, 49.4%)
CIE-LAB	lab(18.91, 37.45, -55.41)
CIE-LCH	lch(18.91, 66.88, 304.05°)
OKLab	oklab(31.73% 0.0156 -0.1602)
OKLCH	oklch(31.73% 0.161 275.5)
XYZ	xyz(5.0462, 2.7257, 21.0248)
Luminance	0.0273 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#231B81 #79811B

analogous

#1B4681 #231B81 #561B81

triadic

#231B81 #81231B #1B8123

tetradic

#231B81 #811B46 #79811B #1B8156

square

#231B81 #811B46 #79811B #1B8156

split-complementary

#231B81 #81561B #46811B

monochromatic

#08061C #15104E #231B81 #3126B4 #4B3FD7

Accessibility & contrast

On white

13.59

#231B81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.55

#231B81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #231B81

13.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##231B81	#FFFFFF	#000000	##FFFFFF
##231B81	1.00	13.59	1.55	13.59
#FFFFFF	13.59	1.00	21.00	1.00
#000000	1.55	21.00	1.00	21.00
##FFFFFF	13.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003284

Deuteranopia (green-blind)

#00297F

Tritanopia (blue-blind)

#00394D

Achromatopsia (no color)

#2E2E2E

Design tokens & code

CSS

--color: #231b81;
/* rgb */ color: rgb(35, 27, 129);
/* oklch */ color: oklch(31.7% 0.161 275.5);

Tailwind

colors: {
  custom: {
    50: '#6e5aa7',
    500: '#231b81',
    950: '#000000',
  },
}

SCSS

$custom: #231b81;
$custom-light: #6e5aa7;
$custom-dark: #000000;

JSON

{
  "hex": "#231b81",
  "rgb": {
    "r": 35,
    "g": 27,
    "b": 129
  },
  "hsl": {
    "h": 244.706,
    "s": 65.385,
    "l": 30.588
  },
  "oklch": {
    "l": 0.31726,
    "c": 0.16095,
    "h": 275.5
  },
  "luminance": 0.02726
}

Semantic roles & 50–950 ramp

primary

#231B81

secondary

#ACB543

accent

#E83FDB

background

#F7F5FA

surface

#EDE9F4

border

#C8C5CE

text

#080410

muted

#7B797F

Preview Lab

Preview with #231B81

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

Preview Lab → · Contrast checker → · Palette generator →