#283D9B#283D9B

#283D9B is a dark, vivid blue. Relative luminance 0.062; OKLCH L 40.5% C 0.155 H 268.7°. Best body text is #FFFFFF at 9.41:1 contrast (WCAG AA passes).

Color values

HEX	#283D9B
RGB	rgb(40, 61, 155)
HSL	hsl(229, 59%, 38%)
HSV	hsv(229, 74%, 61%)
CMYK	cmyk(74.2%, 60.6%, 0%, 39.2%)
CIE-LAB	lab(29.80, 25.82, -53.66)
CIE-LCH	lch(29.80, 59.55, 295.70°)
OKLab	oklab(40.47% -0.0034 -0.1549)
OKLCH	oklch(40.47% 0.155 268.7)
XYZ	xyz(8.4582, 6.1543, 31.7461)
Luminance	0.0616 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283D9B #9B8628

analogous

#28769B #283D9B #4C289B

triadic

#283D9B #9B283D #3D9B28

tetradic

#283D9B #9B2876 #9B8628 #289B4C

square

#283D9B #9B2876 #9B8628 #289B4C

split-complementary

#283D9B #9B4C28 #769B28

monochromatic

#0F173A #1B2A6A #283D9B #3551CB #667BD7

Accessibility & contrast

On white

9.41

#283D9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#283D9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283D9B

9.41:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283D9B	#FFFFFF	#000000	##FFFFFF
##283D9B	1.00	9.41	2.23	9.41
#FFFFFF	9.41	1.00	21.00	1.00
#000000	2.23	21.00	1.00	21.00
##FFFFFF	9.41	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004C9E

Deuteranopia (green-blind)

#004199

Tritanopia (blue-blind)

#005566

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #283d9b;
/* rgb */ color: rgb(40, 61, 155);
/* oklch */ color: oklch(40.5% 0.155 268.7);

Tailwind

colors: {
  custom: {
    50: '#7372b9',
    500: '#283d9b',
    950: '#000000',
  },
}

SCSS

$custom: #283d9b;
$custom-light: #7372b9;
$custom-dark: #000000;

JSON

{
  "hex": "#283d9b",
  "rgb": {
    "r": 40,
    "g": 61,
    "b": 155
  },
  "hsl": {
    "h": 229.043,
    "s": 58.974,
    "l": 38.235
  },
  "oklch": {
    "l": 0.40473,
    "c": 0.15492,
    "h": 268.7
  },
  "luminance": 0.06155
}

Semantic roles & 50–950 ramp

primary

#283D9B

secondary

#BDAD61

accent

#C646E2

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #283D9B

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

Preview Lab → · Contrast checker → · Palette generator →