#231B9B#231B9B

#231B9B is a dark, vivid blue. Relative luminance 0.035; OKLCH L 34.8% C 0.193 H 272.7°. Best body text is #FFFFFF at 12.34:1 contrast (WCAG AA passes).

Color values

HEX	#231B9B
RGB	rgb(35, 27, 155)
HSL	hsl(244, 70%, 36%)
HSV	hsv(244, 83%, 61%)
CMYK	cmyk(77.4%, 82.6%, 0%, 39.2%)
CIE-LAB	lab(21.97, 45.92, -66.55)
CIE-LCH	lch(21.97, 80.85, 304.60°)
OKLab	oklab(34.76% 0.009 -0.1925)
OKLCH	oklch(34.76% 0.193 272.7)
XYZ	xyz(6.9995, 3.5070, 31.3120)
Luminance	0.0351 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#231B9B #939B1B

analogous

#1B539B #231B9B #631B9B

triadic

#231B9B #9B231B #1B9B23

tetradic

#231B9B #9B1B53 #939B1B #1B9B63

square

#231B9B #9B1B53 #939B1B #1B9B63

split-complementary

#231B9B #9B631B #539B1B

monochromatic

#0B0933 #171267 #231B9B #2F24CF #5950E0

Accessibility & contrast

On white

12.34

#231B9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.70

#231B9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #231B9B

12.34:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##231B9B	#FFFFFF	#000000	##FFFFFF
##231B9B	1.00	12.34	1.70	12.34
#FFFFFF	12.34	1.00	21.00	1.00
#000000	1.70	21.00	1.00	21.00
##FFFFFF	12.34	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003B9E

Deuteranopia (green-blind)

#002E99

Tritanopia (blue-blind)

#00445C

Achromatopsia (no color)

#353535

Design tokens & code

CSS

--color: #231b9b;
/* rgb */ color: rgb(35, 27, 155);
/* oklch */ color: oklch(34.8% 0.193 272.7);

Tailwind

colors: {
  custom: {
    50: '#745bba',
    500: '#231b9b',
    950: '#000000',
  },
}

SCSS

$custom: #231b9b;
$custom-light: #745bba;
$custom-dark: #000000;

JSON

{
  "hex": "#231b9b",
  "rgb": {
    "r": 35,
    "g": 27,
    "b": 155
  },
  "hsl": {
    "h": 243.75,
    "s": 70.33,
    "l": 35.686
  },
  "oklch": {
    "l": 0.34755,
    "c": 0.19275,
    "h": 272.7
  },
  "luminance": 0.03508
}

Semantic roles & 50–950 ramp

primary

#231B9B

secondary

#BCC34F

accent

#ED3BE2

background

#F7F5FB

surface

#EEE9F6

border

#C9C5D0

text

#0A0412

muted

#7C7981

Preview Lab

Preview with #231B9B

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

Preview Lab → · Contrast checker → · Palette generator →