#283F9C#283F9C

#283F9C is a dark, vivid blue. Relative luminance 0.064; OKLCH L 41.0% C 0.154 H 268.2°. Best body text is #FFFFFF at 9.21:1 contrast (WCAG AA passes).

Color values

HEX	#283F9C
RGB	rgb(40, 63, 156)
HSL	hsl(228, 59%, 38%)
HSV	hsv(228, 74%, 61%)
CMYK	cmyk(74.4%, 59.6%, 0%, 38.8%)
CIE-LAB	lab(30.41, 24.86, -53.26)
CIE-LCH	lch(30.41, 58.78, 295.02°)
OKLab	oklab(40.96% -0.0049 -0.1537)
OKLCH	oklch(40.96% 0.154 268.2)
XYZ	xyz(8.6513, 6.4055, 32.2265)
Luminance	0.0641 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283F9C #9C8528

analogous

#28799C #283F9C #4B289C

triadic

#283F9C #9C283F #3F9C28

tetradic

#283F9C #9C2879 #9C8528 #289C4B

square

#283F9C #9C2879 #9C8528 #289C4B

split-complementary

#283F9C #9C4B28 #799C28

monochromatic

#0F183B #1C2B6B #283F9C #3653CB #677DD8

Accessibility & contrast

On white

9.21

#283F9C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.28

#283F9C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283F9C

9.21:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283F9C	#FFFFFF	#000000	##FFFFFF
##283F9C	1.00	9.21	2.28	9.21
#FFFFFF	9.21	1.00	21.00	1.00
#000000	2.28	21.00	1.00	21.00
##FFFFFF	9.21	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004D9F

Deuteranopia (green-blind)

#00429A

Tritanopia (blue-blind)

#005667

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #283f9c;
/* rgb */ color: rgb(40, 63, 156);
/* oklch */ color: oklch(41.0% 0.154 268.2);

Tailwind

colors: {
  custom: {
    50: '#7373ba',
    500: '#283f9c',
    950: '#000000',
  },
}

SCSS

$custom: #283f9c;
$custom-light: #7373ba;
$custom-dark: #000000;

JSON

{
  "hex": "#283f9c",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 156
  },
  "hsl": {
    "h": 228.103,
    "s": 59.184,
    "l": 38.431
  },
  "oklch": {
    "l": 0.40957,
    "c": 0.15377,
    "h": 268.2
  },
  "luminance": 0.06406
}

Semantic roles & 50–950 ramp

primary

#283F9C

secondary

#BEAC62

accent

#C345E2

background

#F7F7FB

surface

#EDEDF6

border

#C8C8D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #283F9C

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

Preview Lab → · Contrast checker → · Palette generator →