#281F9B#281F9B

#281F9B is a dark, vivid blue. Relative luminance 0.038; OKLCH L 35.6% C 0.188 H 274.3°. Best body text is #FFFFFF at 11.93:1 contrast (WCAG AA passes).

Color values

HEX	#281F9B
RGB	rgb(40, 31, 155)
HSL	hsl(244, 67%, 36%)
HSV	hsv(244, 80%, 61%)
CMYK	cmyk(74.2%, 80%, 0%, 39.2%)
CIE-LAB	lab(22.99, 44.28, -64.85)
CIE-LCH	lch(22.99, 78.53, 304.33°)
OKLab	oklab(35.55% 0.0141 -0.1876)
OKLCH	oklch(35.55% 0.188 274.3)
XYZ	xyz(7.2795, 3.7969, 31.3532)
Luminance	0.0380 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#281F9B #929B1F

analogous

#1F549B #281F9B #661F9B

triadic

#281F9B #9B281F #1F9B28

tetradic

#281F9B #9B1F54 #929B1F #1F9B66

square

#281F9B #9B1F54 #929B1F #1F9B66

split-complementary

#281F9B #9B661F #549B1F

monochromatic

#0E0B35 #1B1568 #281F9B #3529CE #6157DD

Accessibility & contrast

On white

11.93

#281F9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.76

#281F9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #281F9B

11.93:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##281F9B	#FFFFFF	#000000	##FFFFFF
##281F9B	1.00	11.93	1.76	11.93
#FFFFFF	11.93	1.00	21.00	1.00
#000000	1.76	21.00	1.00	21.00
##FFFFFF	11.93	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C9E

Deuteranopia (green-blind)

#003199

Tritanopia (blue-blind)

#00455D

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #281f9b;
/* rgb */ color: rgb(40, 31, 155);
/* oklch */ color: oklch(35.6% 0.188 274.3);

Tailwind

colors: {
  custom: {
    50: '#765eba',
    500: '#281f9b',
    950: '#000000',
  },
}

SCSS

$custom: #281f9b;
$custom-light: #765eba;
$custom-dark: #000000;

JSON

{
  "hex": "#281f9b",
  "rgb": {
    "r": 40,
    "g": 31,
    "b": 155
  },
  "hsl": {
    "h": 244.355,
    "s": 66.667,
    "l": 36.471
  },
  "oklch": {
    "l": 0.35551,
    "c": 0.1881,
    "h": 274.3
  },
  "luminance": 0.03798
}

Semantic roles & 50–950 ramp

primary

#281F9B

secondary

#B9C155

accent

#EA3EDD

background

#F7F5FB

surface

#EEE9F6

border

#C9C5D0

text

#0A0412

muted

#7C7981

Preview Lab

Preview with #281F9B

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

Preview Lab → · Contrast checker → · Palette generator →