#283D99#283D99

#283D99 is a dark, vivid blue. Relative luminance 0.061; OKLCH L 40.3% C 0.152 H 268.7°. Best body text is #FFFFFF at 9.47:1 contrast (WCAG AA passes).

Color values

HEX	#283D99
RGB	rgb(40, 61, 153)
HSL	hsl(229, 59%, 38%)
HSV	hsv(229, 74%, 60%)
CMYK	cmyk(73.9%, 60.1%, 0%, 40%)
CIE-LAB	lab(29.63, 25.06, -52.71)
CIE-LCH	lch(29.63, 58.36, 295.43°)
OKLab	oklab(40.3% -0.0034 -0.1521)
OKLCH	oklch(40.3% 0.152 268.7)
XYZ	xyz(8.2916, 6.0876, 30.8689)
Luminance	0.0609 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283D99 #998428

analogous

#287599 #283D99 #4C2899

triadic

#283D99 #99283D #3D9928

tetradic

#283D99 #992875 #998428 #28994C

square

#283D99 #992875 #998428 #28994C

split-complementary

#283D99 #994C28 #759928

monochromatic

#0F1638 #1B2A68 #283D99 #3550CA #657AD7

Accessibility & contrast

On white

9.47

#283D99 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.22

#283D99 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283D99

9.47:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283D99	#FFFFFF	#000000	##FFFFFF
##283D99	1.00	9.47	2.22	9.47
#FFFFFF	9.47	1.00	21.00	1.00
#000000	2.22	21.00	1.00	21.00
##FFFFFF	9.47	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004B9C

Deuteranopia (green-blind)

#004197

Tritanopia (blue-blind)

#005465

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #283d99;
/* rgb */ color: rgb(40, 61, 153);
/* oklch */ color: oklch(40.3% 0.152 268.7);

Tailwind

colors: {
  custom: {
    50: '#7272b8',
    500: '#283d99',
    950: '#000000',
  },
}

SCSS

$custom: #283d99;
$custom-light: #7272b8;
$custom-dark: #000000;

JSON

{
  "hex": "#283d99",
  "rgb": {
    "r": 40,
    "g": 61,
    "b": 153
  },
  "hsl": {
    "h": 228.85,
    "s": 58.549,
    "l": 37.843
  },
  "oklch": {
    "l": 0.40298,
    "c": 0.15214,
    "h": 268.7
  },
  "luminance": 0.06089
}

Semantic roles & 50–950 ramp

primary

#283D99

secondary

#BDAB60

accent

#C546E2

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090711

muted

#7B7A80

Preview Lab

Preview with #283D99

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

Preview Lab → · Contrast checker → · Palette generator →