#283FA5#283FA5

#283FA5 is a dark, vivid blue. Relative luminance 0.067; OKLCH L 41.8% C 0.166 H 268.3°. Best body text is #FFFFFF at 8.96:1 contrast (WCAG AA passes).

Color values

HEX	#283FA5
RGB	rgb(40, 63, 165)
HSL	hsl(229, 61%, 40%)
HSV	hsv(229, 76%, 65%)
CMYK	cmyk(75.8%, 61.8%, 0%, 35.3%)
CIE-LAB	lab(31.16, 28.27, -57.48)
CIE-LCH	lch(31.16, 64.05, 296.19°)
OKLab	oklab(41.75% -0.0048 -0.1661)
OKLCH	oklch(41.75% 0.166 268.3)
XYZ	xyz(9.4418, 6.7217, 36.3898)
Luminance	0.0672 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283FA5 #A58E28

analogous

#287DA5 #283FA5 #4F28A5

triadic

#283FA5 #A5283F #3FA528

tetradic

#283FA5 #A5287D #A58E28 #28A54F

square

#283FA5 #A5287D #A58E28 #28A54F

split-complementary

#283FA5 #A54F28 #7DA528

monochromatic

#101942 #1C2C74 #283FA5 #3B56CF #6C81DB

Accessibility & contrast

On white

8.96

#283FA5 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.34

#283FA5 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283FA5

8.96:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283FA5	#FFFFFF	#000000	##FFFFFF
##283FA5	1.00	8.96	2.34	8.96
#FFFFFF	8.96	1.00	21.00	1.00
#000000	2.34	21.00	1.00	21.00
##FFFFFF	8.96	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004FA8

Deuteranopia (green-blind)

#0044A3

Tritanopia (blue-blind)

#00596C

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #283fa5;
/* rgb */ color: rgb(40, 63, 165);
/* oklch */ color: oklch(41.8% 0.166 268.3);

Tailwind

colors: {
  custom: {
    50: '#7573c1',
    500: '#283fa5',
    950: '#000000',
  },
}

SCSS

$custom: #283fa5;
$custom-light: #7573c1;
$custom-dark: #000000;

JSON

{
  "hex": "#283fa5",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 165
  },
  "hsl": {
    "h": 228.96,
    "s": 60.976,
    "l": 40.196
  },
  "oklch": {
    "l": 0.4175,
    "c": 0.16613,
    "h": 268.3
  },
  "luminance": 0.06723
}

Semantic roles & 50–950 ramp

primary

#283FA5

secondary

#C2B167

accent

#C744E4

background

#F7F7FC

surface

#EEEDF8

border

#C9C8D1

text

#0A0812

muted

#7C7B81

Preview Lab

Preview with #283FA5

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

Preview Lab → · Contrast checker → · Palette generator →