#231F8B#231F8B

#231F8B is a dark, vivid blue. Relative luminance 0.032; OKLCH L 33.4% C 0.170 H 273.8°. Best body text is #FFFFFF at 12.80:1 contrast (WCAG AA passes).

Color values

HEX	#231F8B
RGB	rgb(35, 31, 139)
HSL	hsl(242, 64%, 33%)
HSV	hsv(242, 78%, 55%)
CMYK	cmyk(74.8%, 77.7%, 0%, 45.5%)
CIE-LAB	lab(20.83, 38.57, -58.53)
CIE-LCH	lch(20.83, 70.09, 303.38°)
OKLab	oklab(33.41% 0.0113 -0.1693)
OKLCH	oklch(33.41% 0.17 273.8)
XYZ	xyz(5.8418, 3.2008, 24.7310)
Luminance	0.0320 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#231F8B #878B1F

analogous

#1F518B #231F8B #591F8B

triadic

#231F8B #8B231F #1F8B23

tetradic

#231F8B #8B1F51 #878B1F #1F8B59

square

#231F8B #8B1F51 #878B1F #1F8B59

split-complementary

#231F8B #8B591F #518B1F

monochromatic

#0A0927 #161459 #231F8B #302ABD #524DD7

Accessibility & contrast

On white

12.80

#231F8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.64

#231F8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #231F8B

12.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##231F8B	#FFFFFF	#000000	##FFFFFF
##231F8B	1.00	12.80	1.64	12.80
#FFFFFF	12.80	1.00	21.00	1.00
#000000	1.64	21.00	1.00	21.00
##FFFFFF	12.80	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00378E

Deuteranopia (green-blind)

#002D89

Tritanopia (blue-blind)

#003F54

Achromatopsia (no color)

#323232

Design tokens & code

CSS

--color: #231f8b;
/* rgb */ color: rgb(35, 31, 139);
/* oklch */ color: oklch(33.4% 0.170 273.8);

Tailwind

colors: {
  custom: {
    50: '#705dae',
    500: '#231f8b',
    950: '#000000',
  },
}

SCSS

$custom: #231f8b;
$custom-light: #705dae;
$custom-dark: #000000;

JSON

{
  "hex": "#231f8b",
  "rgb": {
    "r": 35,
    "g": 31,
    "b": 139
  },
  "hsl": {
    "h": 242.222,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.33412,
    "c": 0.16969,
    "h": 273.8
  },
  "luminance": 0.03201
}

Semantic roles & 50–950 ramp

primary

#231F8B

secondary

#B6BA4C

accent

#E741E0

background

#F7F5FA

surface

#EDE9F5

border

#C8C5CF

text

#090410

muted

#7B797F

Preview Lab

Preview with #231F8B

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

Preview Lab → · Contrast checker → · Palette generator →