#283F9D#283F9D

#283F9D is a dark, vivid blue. Relative luminance 0.064; OKLCH L 41.0% C 0.155 H 268.2°. Best body text is #FFFFFF at 9.18:1 contrast (WCAG AA passes).

Color values

HEX	#283F9D
RGB	rgb(40, 63, 157)
HSL	hsl(228, 59%, 39%)
HSV	hsv(228, 75%, 62%)
CMYK	cmyk(74.5%, 59.9%, 0%, 38.4%)
CIE-LAB	lab(30.50, 25.24, -53.74)
CIE-LCH	lch(30.50, 59.37, 295.16°)
OKLab	oklab(41.04% -0.0049 -0.1551)
OKLCH	oklch(41.04% 0.155 268.2)
XYZ	xyz(8.7363, 6.4395, 32.6743)
Luminance	0.0644 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283F9D #9D8628

analogous

#28799D #283F9D #4B289D

triadic

#283F9D #9D283F #3F9D28

tetradic

#283F9D #9D2879 #9D8628 #289D4B

square

#283F9D #9D2879 #9D8628 #289D4B

split-complementary

#283F9D #9D4B28 #799D28

monochromatic

#0F183B #1C2B6C #283F9D #3654CC #677DD8

Accessibility & contrast

On white

9.18

#283F9D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.29

#283F9D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283F9D

9.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283F9D	#FFFFFF	#000000	##FFFFFF
##283F9D	1.00	9.18	2.29	9.18
#FFFFFF	9.18	1.00	21.00	1.00
#000000	2.29	21.00	1.00	21.00
##FFFFFF	9.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004DA0

Deuteranopia (green-blind)

#00439B

Tritanopia (blue-blind)

#005767

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #283f9d;
/* rgb */ color: rgb(40, 63, 157);
/* oklch */ color: oklch(41.0% 0.155 268.2);

Tailwind

colors: {
  custom: {
    50: '#7373bb',
    500: '#283f9d',
    950: '#000000',
  },
}

SCSS

$custom: #283f9d;
$custom-light: #7373bb;
$custom-dark: #000000;

JSON

{
  "hex": "#283f9d",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 157
  },
  "hsl": {
    "h": 228.205,
    "s": 59.391,
    "l": 38.627
  },
  "oklch": {
    "l": 0.41044,
    "c": 0.15516,
    "h": 268.2
  },
  "luminance": 0.0644
}

Semantic roles & 50–950 ramp

primary

#283F9D

secondary

#BEAC62

accent

#C445E3

background

#F7F7FB

surface

#EEEDF6

border

#C9C8D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #283F9D

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

Preview Lab → · Contrast checker → · Palette generator →