#231D9B#231D9B

#231D9B is a dark, vivid blue. Relative luminance 0.036; OKLCH L 35.0% C 0.191 H 272.5°. Best body text is #FFFFFF at 12.21:1 contrast (WCAG AA passes).

Color values

HEX	#231D9B
RGB	rgb(35, 29, 155)
HSL	hsl(243, 68%, 36%)
HSV	hsv(243, 81%, 61%)
CMYK	cmyk(77.4%, 81.3%, 0%, 39.2%)
CIE-LAB	lab(22.31, 44.92, -65.98)
CIE-LCH	lch(22.31, 79.83, 304.25°)
OKLab	oklab(34.99% 0.0084 -0.1909)
OKLCH	oklch(34.99% 0.191 272.5)
XYZ	xyz(7.0469, 3.6019, 31.3278)
Luminance	0.0360 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#231D9B #959B1D

analogous

#1D569B #231D9B #621D9B

triadic

#231D9B #9B231D #1D9B23

tetradic

#231D9B #9B1D56 #959B1D #1D9B62

square

#231D9B #9B1D56 #959B1D #1D9B62

split-complementary

#231D9B #9B621D #569B1D

monochromatic

#0C0A34 #171367 #231D9B #2F27CF #5A53DF

Accessibility & contrast

On white

12.21

#231D9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.72

#231D9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #231D9B

12.21:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##231D9B	#FFFFFF	#000000	##FFFFFF
##231D9B	1.00	12.21	1.72	12.21
#FFFFFF	12.21	1.00	21.00	1.00
#000000	1.72	21.00	1.00	21.00
##FFFFFF	12.21	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003B9E

Deuteranopia (green-blind)

#002F99

Tritanopia (blue-blind)

#00445C

Achromatopsia (no color)

#353535

Design tokens & code

CSS

--color: #231d9b;
/* rgb */ color: rgb(35, 29, 155);
/* oklch */ color: oklch(35.0% 0.191 272.5);

Tailwind

colors: {
  custom: {
    50: '#745cba',
    500: '#231d9b',
    950: '#000000',
  },
}

SCSS

$custom: #231d9b;
$custom-light: #745cba;
$custom-dark: #000000;

JSON

{
  "hex": "#231d9b",
  "rgb": {
    "r": 35,
    "g": 29,
    "b": 155
  },
  "hsl": {
    "h": 242.857,
    "s": 68.478,
    "l": 36.078
  },
  "oklch": {
    "l": 0.3499,
    "c": 0.19113,
    "h": 272.5
  },
  "luminance": 0.03603
}

Semantic roles & 50–950 ramp

primary

#231D9B

secondary

#BDC252

accent

#EB3CE3

background

#F7F5FB

surface

#EEE9F6

border

#C9C5D0

text

#0A0412

muted

#7C7981

Preview Lab

Preview with #231D9B

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

Preview Lab → · Contrast checker → · Palette generator →