#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
RGBrgb(35, 27, 155)
HSLhsl(244, 70%, 36%)
HSVhsv(244, 83%, 61%)
CMYKcmyk(77.4%, 82.6%, 0%, 39.2%)
CIE-LABlab(21.97, 45.92, -66.55)
CIE-LCHlch(21.97, 80.85, 304.60°)
OKLaboklab(34.76% 0.009 -0.1925)
OKLCHoklch(34.76% 0.193 272.7)
XYZxyz(6.9995, 3.5070, 31.3120)
Luminance0.0351 (WCAG relative)
Temperaturecool
Familyblue

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
##231B9B1.0012.341.7012.34
#FFFFFF12.341.0021.001.00
#0000001.7021.001.0021.00
##FFFFFF12.341.0021.001.00

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 →

#231B9B Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva