#231F9B#231F9B

#231F9B is a dark, vivid blue. Relative luminance 0.037; OKLCH L 35.2% C 0.189 H 272.3°. Best body text is #FFFFFF at 12.06:1 contrast (WCAG AA passes).

Color values

HEX	#231F9B
RGB	rgb(35, 31, 155)
HSL	hsl(242, 67%, 36%)
HSV	hsv(242, 80%, 61%)
CMYK	cmyk(77.4%, 80%, 0%, 39.2%)
CIE-LAB	lab(22.66, 43.89, -65.39)
CIE-LCH	lch(22.66, 78.76, 303.87°)
OKLab	oklab(35.24% 0.0077 -0.1893)
OKLCH	oklch(35.24% 0.189 272.3)
XYZ	xyz(7.0975, 3.7031, 31.3447)
Luminance	0.0370 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#231F9B #979B1F

analogous

#1F599B #231F9B #611F9B

triadic

#231F9B #9B231F #1F9B23

tetradic

#231F9B #9B1F59 #979B1F #1F9B61

square

#231F9B #9B1F59 #979B1F #1F9B61

split-complementary

#231F9B #9B611F #599B1F

monochromatic

#0C0B35 #171568 #231F9B #2F29CE #5B57DD

Accessibility & contrast

On white

12.06

#231F9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.74

#231F9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #231F9B

12.06:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##231F9B	#FFFFFF	#000000	##FFFFFF
##231F9B	1.00	12.06	1.74	12.06
#FFFFFF	12.06	1.00	21.00	1.00
#000000	1.74	21.00	1.00	21.00
##FFFFFF	12.06	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C9E

Deuteranopia (green-blind)

#003099

Tritanopia (blue-blind)

#00455D

Achromatopsia (no color)

#363636

Design tokens & code

CSS

--color: #231f9b;
/* rgb */ color: rgb(35, 31, 155);
/* oklch */ color: oklch(35.2% 0.189 272.3);

Tailwind

colors: {
  custom: {
    50: '#745eba',
    500: '#231f9b',
    950: '#000000',
  },
}

SCSS

$custom: #231f9b;
$custom-light: #745eba;
$custom-dark: #000000;

JSON

{
  "hex": "#231f9b",
  "rgb": {
    "r": 35,
    "g": 31,
    "b": 155
  },
  "hsl": {
    "h": 241.935,
    "s": 66.667,
    "l": 36.471
  },
  "oklch": {
    "l": 0.35239,
    "c": 0.18942,
    "h": 272.3
  },
  "luminance": 0.03704
}

Semantic roles & 50–950 ramp

primary

#231F9B

secondary

#BEC155

accent

#EA3EE4

background

#F7F5FB

surface

#EEE9F6

border

#C9C5D0

text

#0A0412

muted

#7C7981

Preview Lab

Preview with #231F9B

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

Preview Lab → · Contrast checker → · Palette generator →