#231B9A#231B9A

#231B9A is a dark, vivid blue. Relative luminance 0.035; OKLCH L 34.6% C 0.192 H 272.8°. Best body text is #FFFFFF at 12.39:1 contrast (WCAG AA passes).

Color values

HEX	#231B9A
RGB	rgb(35, 27, 154)
HSL	hsl(244, 70%, 35%)
HSV	hsv(244, 82%, 60%)
CMYK	cmyk(77.3%, 82.5%, 0%, 39.6%)
CIE-LAB	lab(21.85, 45.60, -66.13)
CIE-LCH	lch(21.85, 80.33, 304.59°)
OKLab	oklab(34.64% 0.0093 -0.1913)
OKLCH	oklch(34.64% 0.192 272.8)
XYZ	xyz(6.9159, 3.4735, 30.8716)
Luminance	0.0347 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#231B9A #929A1B

analogous

#1B529A #231B9A #631B9A

triadic

#231B9A #9A231B #1B9A23

tetradic

#231B9A #9A1B52 #929A1B #1B9A63

square

#231B9A #9A1B52 #929A1B #1B9A63

split-complementary

#231B9A #9A631B #529A1B

monochromatic

#0B0932 #171266 #231B9A #2F24CE #584FE0

Accessibility & contrast

On white

12.39

#231B9A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.69

#231B9A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #231B9A

12.39:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##231B9A	#FFFFFF	#000000	##FFFFFF
##231B9A	1.00	12.39	1.69	12.39
#FFFFFF	12.39	1.00	21.00	1.00
#000000	1.69	21.00	1.00	21.00
##FFFFFF	12.39	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003A9D

Deuteranopia (green-blind)

#002E98

Tritanopia (blue-blind)

#00435C

Achromatopsia (no color)

#343434

Design tokens & code

CSS

--color: #231b9a;
/* rgb */ color: rgb(35, 27, 154);
/* oklch */ color: oklch(34.6% 0.192 272.8);

Tailwind

colors: {
  custom: {
    50: '#745bb9',
    500: '#231b9a',
    950: '#000000',
  },
}

SCSS

$custom: #231b9a;
$custom-light: #745bb9;
$custom-dark: #000000;

JSON

{
  "hex": "#231b9a",
  "rgb": {
    "r": 35,
    "g": 27,
    "b": 154
  },
  "hsl": {
    "h": 243.78,
    "s": 70.166,
    "l": 35.49
  },
  "oklch": {
    "l": 0.34636,
    "c": 0.19157,
    "h": 272.8
  },
  "luminance": 0.03474
}

Semantic roles & 50–950 ramp

primary

#231B9A

secondary

#BBC34E

accent

#ED3BE2

background

#F7F5FB

surface

#EEE9F6

border

#C9C5D0

text

#0A0412

muted

#7C7981

Preview Lab

Preview with #231B9A

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

Preview Lab → · Contrast checker → · Palette generator →