#283AB1#283AB1

#283AB1 is a dark, vivid blue. Relative luminance 0.067; OKLCH L 42.0% C 0.188 H 269.3°. Best body text is #FFFFFF at 9.01:1 contrast (WCAG AA passes).

Color values

HEX	#283AB1
RGB	rgb(40, 58, 177)
HSL	hsl(232, 63%, 43%)
HSV	hsv(232, 77%, 69%)
CMYK	cmyk(77.4%, 67.2%, 0%, 30.6%)
CIE-LAB	lab(31.00, 35.97, -64.93)
CIE-LCH	lch(31.00, 74.23, 298.98°)
OKLab	oklab(41.96% -0.0023 -0.1879)
OKLCH	oklch(41.96% 0.188 269.3)
XYZ	xyz(10.3212, 6.6504, 42.3261)
Luminance	0.0665 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283AB1 #B19F28

analogous

#287EB1 #283AB1 #5B28B1

triadic

#283AB1 #B1283A #3AB128

tetradic

#283AB1 #B1287E #B19F28 #28B15B

square

#283AB1 #B1287E #B19F28 #28B15B

split-complementary

#283AB1 #B15B28 #7EB128

monochromatic

#11194D #1D2A7F #283AB1 #4255D4 #7482E0

Accessibility & contrast

On white

9.01

#283AB1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.33

#283AB1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283AB1

9.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283AB1	#FFFFFF	#000000	##FFFFFF
##283AB1	1.00	9.01	2.33	9.01
#FFFFFF	9.01	1.00	21.00	1.00
#000000	2.33	21.00	1.00	21.00
##FFFFFF	9.01	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050B5

Deuteranopia (green-blind)

#0042AF

Tritanopia (blue-blind)

#005A70

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #283ab1;
/* rgb */ color: rgb(40, 58, 177);
/* oklch */ color: oklch(42.0% 0.188 269.3);

Tailwind

colors: {
  custom: {
    50: '#7970c9',
    500: '#283ab1',
    950: '#000000',
  },
}

SCSS

$custom: #283ab1;
$custom-light: #7970c9;
$custom-dark: #000000;

JSON

{
  "hex": "#283ab1",
  "rgb": {
    "r": 40,
    "g": 58,
    "b": 177
  },
  "hsl": {
    "h": 232.117,
    "s": 63.134,
    "l": 42.549
  },
  "oklch": {
    "l": 0.41957,
    "c": 0.18795,
    "h": 269.3
  },
  "luminance": 0.06652
}

Semantic roles & 50–950 ramp

primary

#283AB1

secondary

#C7BB6E

accent

#D142E6

background

#F8F6FC

surface

#EFECF8

border

#CAC7D1

text

#0B0713

muted

#7C7A82

Preview Lab

Preview with #283AB1

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

Preview Lab → · Contrast checker → · Palette generator →