#283A8B#283A8B

#283A8B is a dark, vivid blue. Relative luminance 0.053; OKLCH L 38.5% C 0.136 H 269.4°. Best body text is #FFFFFF at 10.15:1 contrast (WCAG AA passes).

Color values

HEX	#283A8B
RGB	rgb(40, 58, 139)
HSL	hsl(229, 55%, 35%)
HSV	hsv(229, 71%, 55%)
CMYK	cmyk(71.2%, 58.3%, 0%, 45.5%)
CIE-LAB	lab(27.68, 21.76, -47.28)
CIE-LCH	lch(27.68, 52.05, 294.71°)
OKLab	oklab(38.49% -0.0013 -0.1362)
OKLCH	oklch(38.49% 0.136 269.4)
XYZ	xyz(7.0467, 5.3406, 25.0806)
Luminance	0.0534 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283A8B #8B7928

analogous

#286B8B #283A8B #48288B

triadic

#283A8B #8B283A #3A8B28

tetradic

#283A8B #8B286B #8B7928 #288B48

square

#283A8B #8B286B #8B7928 #288B48

split-complementary

#283A8B #8B4828 #6B8B28

monochromatic

#0D122C #1A265B #283A8B #364EBB #5D72D0

Accessibility & contrast

On white

10.15

#283A8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.07

#283A8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283A8B

10.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283A8B	#FFFFFF	#000000	##FFFFFF
##283A8B	1.00	10.15	2.07	10.15
#FFFFFF	10.15	1.00	21.00	1.00
#000000	2.07	21.00	1.00	21.00
##FFFFFF	10.15	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00468E

Deuteranopia (green-blind)

#003D89

Tritanopia (blue-blind)

#004E5C

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #283a8b;
/* rgb */ color: rgb(40, 58, 139);
/* oklch */ color: oklch(38.5% 0.136 269.4);

Tailwind

colors: {
  custom: {
    50: '#6f6fae',
    500: '#283a8b',
    950: '#000000',
  },
}

SCSS

$custom: #283a8b;
$custom-light: #6f6fae;
$custom-dark: #000000;

JSON

{
  "hex": "#283a8b",
  "rgb": {
    "r": 40,
    "g": 58,
    "b": 139
  },
  "hsl": {
    "h": 229.091,
    "s": 55.307,
    "l": 35.098
  },
  "oklch": {
    "l": 0.38487,
    "c": 0.1362,
    "h": 269.4
  },
  "luminance": 0.05341
}

Semantic roles & 50–950 ramp

primary

#283A8B

secondary

#B6A559

accent

#C349DF

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #283A8B

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

Preview Lab → · Contrast checker → · Palette generator →