#231B8B#231B8B

#231B8B is a dark, vivid blue. Relative luminance 0.030; OKLCH L 32.9% C 0.173 H 274.3°. Best body text is #FFFFFF at 13.12:1 contrast (WCAG AA passes).

Color values

HEX	#231B8B
RGB	rgb(35, 27, 139)
HSL	hsl(244, 67%, 33%)
HSV	hsv(244, 81%, 55%)
CMYK	cmyk(74.8%, 80.6%, 0%, 45.5%)
CIE-LAB	lab(20.06, 40.77, -59.80)
CIE-LCH	lch(20.06, 72.37, 304.28°)
OKLab	oklab(32.87% 0.0131 -0.173)
OKLCH	oklch(32.87% 0.173 274.3)
XYZ	xyz(5.7437, 3.0047, 24.6984)
Luminance	0.0301 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#231B8B #838B1B

analogous

#1B4B8B #231B8B #5B1B8B

triadic

#231B8B #8B231B #1B8B23

tetradic

#231B8B #8B1B4B #838B1B #1B8B5B

square

#231B8B #8B1B4B #838B1B #1B8B5B

split-complementary

#231B8B #8B5B1B #4B8B1B

monochromatic

#090725 #161158 #231B8B #3025BE #5045DB

Accessibility & contrast

On white

13.12

#231B8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.60

#231B8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #231B8B

13.12:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##231B8B	#FFFFFF	#000000	##FFFFFF
##231B8B	1.00	13.12	1.60	13.12
#FFFFFF	13.12	1.00	21.00	1.00
#000000	1.60	21.00	1.00	21.00
##FFFFFF	13.12	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00358E

Deuteranopia (green-blind)

#002B89

Tritanopia (blue-blind)

#003D53

Achromatopsia (no color)

#303030

Design tokens & code

CSS

--color: #231b8b;
/* rgb */ color: rgb(35, 27, 139);
/* oklch */ color: oklch(32.9% 0.173 274.3);

Tailwind

colors: {
  custom: {
    50: '#705aae',
    500: '#231b8b',
    950: '#000000',
  },
}

SCSS

$custom: #231b8b;
$custom-light: #705aae;
$custom-dark: #000000;

JSON

{
  "hex": "#231b8b",
  "rgb": {
    "r": 35,
    "g": 27,
    "b": 139
  },
  "hsl": {
    "h": 244.286,
    "s": 67.47,
    "l": 32.549
  },
  "oklch": {
    "l": 0.32873,
    "c": 0.17345,
    "h": 274.3
  },
  "luminance": 0.03005
}

Semantic roles & 50–950 ramp

primary

#231B8B

secondary

#B4BC45

accent

#EA3DDE

background

#F7F5FA

surface

#EDE9F5

border

#C8C5CF

text

#090410

muted

#7B797F

Preview Lab

Preview with #231B8B

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

Preview Lab → · Contrast checker → · Palette generator →