#283FB0#283FB0

#283FB0 is a dark, vivid blue. Relative luminance 0.071; OKLCH L 42.8% C 0.181 H 268.4°. Best body text is #FFFFFF at 8.65:1 contrast (WCAG AA passes).

Color values

HEX	#283FB0
RGB	rgb(40, 63, 176)
HSL	hsl(230, 63%, 42%)
HSV	hsv(230, 77%, 69%)
CMYK	cmyk(77.3%, 64.2%, 0%, 31%)
CIE-LAB	lab(32.12, 32.38, -62.49)
CIE-LCH	lch(32.12, 70.38, 297.39°)
OKLab	oklab(42.75% -0.0051 -0.1808)
OKLCH	oklch(42.75% 0.181 268.4)
XYZ	xyz(10.4863, 7.1396, 41.8913)
Luminance	0.0714 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283FB0 #B09928

analogous

#2883B0 #283FB0 #5528B0

triadic

#283FB0 #B0283F #3FB028

tetradic

#283FB0 #B02883 #B09928 #28B055

square

#283FB0 #B02883 #B09928 #28B055

split-complementary

#283FB0 #B05528 #83B028

monochromatic

#111B4C #1D2D7E #283FB0 #415AD4 #7385DF

Accessibility & contrast

On white

8.65

#283FB0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.43

#283FB0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283FB0

8.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283FB0	#FFFFFF	#000000	##FFFFFF
##283FB0	1.00	8.65	2.43	8.65
#FFFFFF	8.65	1.00	21.00	1.00
#000000	2.43	21.00	1.00	21.00
##FFFFFF	8.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052B4

Deuteranopia (green-blind)

#0045AE

Tritanopia (blue-blind)

#005D71

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #283fb0;
/* rgb */ color: rgb(40, 63, 176);
/* oklch */ color: oklch(42.8% 0.181 268.4);

Tailwind

colors: {
  custom: {
    50: '#7874c9',
    500: '#283fb0',
    950: '#000000',
  },
}

SCSS

$custom: #283fb0;
$custom-light: #7874c9;
$custom-dark: #000000;

JSON

{
  "hex": "#283fb0",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 176
  },
  "hsl": {
    "h": 229.853,
    "s": 62.963,
    "l": 42.353
  },
  "oklch": {
    "l": 0.42753,
    "c": 0.18083,
    "h": 268.4
  },
  "luminance": 0.07141
}

Semantic roles & 50–950 ramp

primary

#283FB0

secondary

#C6B76D

accent

#CA42E6

background

#F8F7FC

surface

#EFEDF8

border

#CAC8D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #283FB0

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

Preview Lab → · Contrast checker → · Palette generator →