#283B99#283B99

#283B99 is a dark, vivid blue. Relative luminance 0.059; OKLCH L 39.9% C 0.155 H 269.3°. Best body text is #FFFFFF at 9.65:1 contrast (WCAG AA passes).

Color values

HEX	#283B99
RGB	rgb(40, 59, 153)
HSL	hsl(230, 59%, 38%)
HSV	hsv(230, 74%, 60%)
CMYK	cmyk(73.9%, 61.4%, 0%, 40%)
CIE-LAB	lab(29.10, 26.41, -53.57)
CIE-LCH	lch(29.10, 59.73, 296.24°)
OKLab	oklab(39.9% -0.0019 -0.1547)
OKLCH	oklch(39.9% 0.155 269.3)
XYZ	xyz(8.1868, 5.8781, 30.8339)
Luminance	0.0588 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283B99 #998628

analogous

#287399 #283B99 #4E2899

triadic

#283B99 #99283B #3B9928

tetradic

#283B99 #992873 #998628 #28994E

square

#283B99 #992873 #998628 #28994E

split-complementary

#283B99 #994E28 #739928

monochromatic

#0F1638 #1B2868 #283B99 #354ECA #6578D7

Accessibility & contrast

On white

9.65

#283B99 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.18

#283B99 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283B99

9.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283B99	#FFFFFF	#000000	##FFFFFF
##283B99	1.00	9.65	2.18	9.65
#FFFFFF	9.65	1.00	21.00	1.00
#000000	2.18	21.00	1.00	21.00
##FFFFFF	9.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004A9C

Deuteranopia (green-blind)

#003F97

Tritanopia (blue-blind)

#005364

Achromatopsia (no color)

#454545

Design tokens & code

CSS

--color: #283b99;
/* rgb */ color: rgb(40, 59, 153);
/* oklch */ color: oklch(39.9% 0.155 269.3);

Tailwind

colors: {
  custom: {
    50: '#7370b8',
    500: '#283b99',
    950: '#000000',
  },
}

SCSS

$custom: #283b99;
$custom-light: #7370b8;
$custom-dark: #000000;

JSON

{
  "hex": "#283b99",
  "rgb": {
    "r": 40,
    "g": 59,
    "b": 153
  },
  "hsl": {
    "h": 229.912,
    "s": 58.549,
    "l": 37.843
  },
  "oklch": {
    "l": 0.39904,
    "c": 0.15467,
    "h": 269.3
  },
  "luminance": 0.05879
}

Semantic roles & 50–950 ramp

primary

#283B99

secondary

#BDAD60

accent

#C846E2

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090711

muted

#7B7A80

Preview Lab

Preview with #283B99

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

Preview Lab → · Contrast checker → · Palette generator →