#283FA3#283FA3

#283FA3 is a dark, vivid blue. Relative luminance 0.067; OKLCH L 41.6% C 0.163 H 268.3°. Best body text is #FFFFFF at 9.01:1 contrast (WCAG AA passes).

Color values

HEX	#283FA3
RGB	rgb(40, 63, 163)
HSL	hsl(229, 61%, 40%)
HSV	hsv(229, 75%, 64%)
CMYK	cmyk(75.5%, 61.3%, 0%, 36.1%)
CIE-LAB	lab(31.00, 27.51, -56.55)
CIE-LCH	lch(31.00, 62.89, 295.95°)
OKLab	oklab(41.57% -0.0048 -0.1633)
OKLCH	oklch(41.57% 0.163 268.3)
XYZ	xyz(9.2611, 6.6495, 35.4386)
Luminance	0.0665 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283FA3 #A38C28

analogous

#287DA3 #283FA3 #4E28A3

triadic

#283FA3 #A3283F #3FA328

tetradic

#283FA3 #A3287D #A38C28 #28A34E

square

#283FA3 #A3287D #A38C28 #28A34E

split-complementary

#283FA3 #A34E28 #7DA328

monochromatic

#101941 #1C2C72 #283FA3 #3A55CF #6B80DB

Accessibility & contrast

On white

9.01

#283FA3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.33

#283FA3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283FA3

9.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283FA3	#FFFFFF	#000000	##FFFFFF
##283FA3	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)

#004FA6

Deuteranopia (green-blind)

#0043A1

Tritanopia (blue-blind)

#00586B

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #283fa3;
/* rgb */ color: rgb(40, 63, 163);
/* oklch */ color: oklch(41.6% 0.163 268.3);

Tailwind

colors: {
  custom: {
    50: '#7573bf',
    500: '#283fa3',
    950: '#000000',
  },
}

SCSS

$custom: #283fa3;
$custom-light: #7573bf;
$custom-dark: #000000;

JSON

{
  "hex": "#283fa3",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 163
  },
  "hsl": {
    "h": 228.78,
    "s": 60.591,
    "l": 39.804
  },
  "oklch": {
    "l": 0.41572,
    "c": 0.16341,
    "h": 268.3
  },
  "luminance": 0.0665
}

Semantic roles & 50–950 ramp

primary

#283FA3

secondary

#C1B066

accent

#C644E4

background

#F7F7FB

surface

#EEEDF7

border

#C9C8D0

text

#0A0812

muted

#7C7B81

Preview Lab

Preview with #283FA3

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

Preview Lab → · Contrast checker → · Palette generator →