#231B59#231B59

#231B59 is a dark, moderate blue. Relative luminance 0.019; OKLCH L 27.5% C 0.107 H 282.7°. Best body text is #FFFFFF at 15.30:1 contrast (WCAG AA passes).

Color values

HEX	#231B59
RGB	rgb(35, 27, 89)
HSL	hsl(248, 53%, 23%)
HSV	hsv(248, 70%, 35%)
CMYK	cmyk(60.7%, 69.7%, 0%, 65.1%)
CIE-LAB	lab(14.75, 23.49, -36.18)
CIE-LCH	lch(14.75, 43.13, 302.99°)
OKLab	oklab(27.5% 0.0234 -0.104)
OKLCH	oklch(27.5% 0.107 282.7)
XYZ	xyz(2.8877, 1.8623, 9.6565)
Luminance	0.0186 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#231B59 #51591B

analogous

#1B3259 #231B59 #421B59

triadic

#231B59 #59231B #1B5923

tetradic

#231B59 #591B32 #51591B #1B5942

square

#231B59 #591B32 #51591B #1B5942

split-complementary

#231B59 #59421B #32591B

monochromatic

#090717 #110D2A #231B59 #352988 #4837B7

Accessibility & contrast

On white

15.30

#231B59 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.37

#231B59 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #231B59

15.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##231B59	#FFFFFF	#000000	##FFFFFF
##231B59	1.00	15.30	1.37	15.30
#FFFFFF	15.30	1.00	21.00	1.00
#000000	1.37	21.00	1.00	21.00
##FFFFFF	15.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00275B

Deuteranopia (green-blind)

#002358

Tritanopia (blue-blind)

#082A37

Achromatopsia (no color)

#252525

Design tokens & code

CSS

--color: #231b59;
/* rgb */ color: rgb(35, 27, 89);
/* oklch */ color: oklch(27.5% 0.107 282.7);

Tailwind

colors: {
  custom: {
    50: '#645888',
    500: '#231b59',
    950: '#000000',
  },
}

SCSS

$custom: #231b59;
$custom-light: #645888;
$custom-dark: #000000;

JSON

{
  "hex": "#231b59",
  "rgb": {
    "r": 35,
    "g": 27,
    "b": 89
  },
  "hsl": {
    "h": 247.742,
    "s": 53.448,
    "l": 22.745
  },
  "oklch": {
    "l": 0.27497,
    "c": 0.10659,
    "h": 282.7
  },
  "luminance": 0.01862
}

Semantic roles & 50–950 ramp

primary

#231B59

secondary

#858F41

accent

#DD4BCA

background

#F6F5F8

surface

#EBE9F0

border

#C6C5CB

text

#06030B

muted

#7A787C

Preview Lab

Preview with #231B59

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

Preview Lab → · Contrast checker → · Palette generator →