#231B9E#231B9E

#231B9E is a dark, vivid blue. Relative luminance 0.036; OKLCH L 35.1% C 0.196 H 272.4°. Best body text is #FFFFFF at 12.20:1 contrast (WCAG AA passes).

Color values

HEX	#231B9E
RGB	rgb(35, 27, 158)
HSL	hsl(244, 71%, 36%)
HSV	hsv(244, 83%, 62%)
CMYK	cmyk(77.8%, 82.9%, 0%, 38%)
CIE-LAB	lab(22.33, 46.86, -67.78)
CIE-LCH	lch(22.33, 82.40, 304.66°)
OKLab	oklab(35.11% 0.0083 -0.1961)
OKLCH	oklch(35.11% 0.196 272.4)
XYZ	xyz(7.2546, 3.6090, 32.6554)
Luminance	0.0361 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#231B9E #969E1B

analogous

#1B559E #231B9E #651B9E

triadic

#231B9E #9E231B #1B9E23

tetradic

#231B9E #9E1B55 #969E1B #1B9E65

square

#231B9E #9E1B55 #969E1B #1B9E65

split-complementary

#231B9E #9E651B #559E1B

monochromatic

#0C0935 #17126A #231B9E #2F24D2 #5B52E1

Accessibility & contrast

On white

12.20

#231B9E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.72

#231B9E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #231B9E

12.20:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##231B9E	#FFFFFF	#000000	##FFFFFF
##231B9E	1.00	12.20	1.72	12.20
#FFFFFF	12.20	1.00	21.00	1.00
#000000	1.72	21.00	1.00	21.00
##FFFFFF	12.20	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003CA2

Deuteranopia (green-blind)

#002F9C

Tritanopia (blue-blind)

#00455E

Achromatopsia (no color)

#353535

Design tokens & code

CSS

--color: #231b9e;
/* rgb */ color: rgb(35, 27, 158);
/* oklch */ color: oklch(35.1% 0.196 272.4);

Tailwind

colors: {
  custom: {
    50: '#755cbc',
    500: '#231b9e',
    950: '#000000',
  },
}

SCSS

$custom: #231b9e;
$custom-light: #755cbc;
$custom-dark: #000000;

JSON

{
  "hex": "#231b9e",
  "rgb": {
    "r": 35,
    "g": 27,
    "b": 158
  },
  "hsl": {
    "h": 243.664,
    "s": 70.811,
    "l": 36.275
  },
  "oklch": {
    "l": 0.35113,
    "c": 0.19628,
    "h": 272.4
  },
  "luminance": 0.0361
}

Semantic roles & 50–950 ramp

primary

#231B9E

secondary

#BDC451

accent

#EE3AE3

background

#F7F5FB

surface

#EEE9F7

border

#C9C5D0

text

#0A0412

muted

#7C7981

Preview Lab

Preview with #231B9E

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

Preview Lab → · Contrast checker → · Palette generator →