#283FA8#283FA8

#283FA8 is a dark, vivid blue. Relative luminance 0.068; OKLCH L 42.0% C 0.170 H 268.4°. Best body text is #FFFFFF at 8.87:1 contrast (WCAG AA passes).

Color values

HEX	#283FA8
RGB	rgb(40, 63, 168)
HSL	hsl(229, 62%, 41%)
HSV	hsv(229, 76%, 66%)
CMYK	cmyk(76.2%, 62.5%, 0%, 34.1%)
CIE-LAB	lab(31.42, 29.40, -58.86)
CIE-LCH	lch(31.42, 65.79, 296.54°)
OKLab	oklab(42.02% -0.0049 -0.1701)
OKLCH	oklch(42.02% 0.17 268.4)
XYZ	xyz(9.7180, 6.8322, 37.8448)
Luminance	0.0683 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283FA8 #A89128

analogous

#287FA8 #283FA8 #5128A8

triadic

#283FA8 #A8283F #3FA828

tetradic

#283FA8 #A8287F #A89128 #28A851

square

#283FA8 #A8287F #A89128 #28A851

split-complementary

#283FA8 #A85128 #7FA828

monochromatic

#101A45 #1C2C77 #283FA8 #3D57D1 #6E82DC

Accessibility & contrast

On white

8.87

#283FA8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.37

#283FA8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283FA8

8.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283FA8	#FFFFFF	#000000	##FFFFFF
##283FA8	1.00	8.87	2.37	8.87
#FFFFFF	8.87	1.00	21.00	1.00
#000000	2.37	21.00	1.00	21.00
##FFFFFF	8.87	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050AB

Deuteranopia (green-blind)

#0044A6

Tritanopia (blue-blind)

#005A6D

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #283fa8;
/* rgb */ color: rgb(40, 63, 168);
/* oklch */ color: oklch(42.0% 0.170 268.4);

Tailwind

colors: {
  custom: {
    50: '#7673c3',
    500: '#283fa8',
    950: '#000000',
  },
}

SCSS

$custom: #283fa8;
$custom-light: #7673c3;
$custom-dark: #000000;

JSON

{
  "hex": "#283fa8",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 168
  },
  "hsl": {
    "h": 229.219,
    "s": 61.538,
    "l": 40.784
  },
  "oklch": {
    "l": 0.4202,
    "c": 0.17018,
    "h": 268.4
  },
  "luminance": 0.06833
}

Semantic roles & 50–950 ramp

primary

#283FA8

secondary

#C3B369

accent

#C843E5

background

#F7F7FC

surface

#EEEDF8

border

#C9C8D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #283FA8

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

Preview Lab → · Contrast checker → · Palette generator →