#283F63#283F63

#283F63 is a dark, moderate blue. Relative luminance 0.049; OKLCH L 36.7% C 0.069 H 259.1°. Best body text is #FFFFFF at 10.60:1 contrast (WCAG AA passes).

Color values

HEX	#283F63
RGB	rgb(40, 63, 99)
HSL	hsl(217, 42%, 27%)
HSV	hsv(217, 60%, 39%)
CMYK	cmyk(59.6%, 36.4%, 0%, 61.2%)
CIE-LAB	lab(26.47, 3.09, -23.96)
CIE-LCH	lch(26.47, 24.16, 277.35°)
OKLab	oklab(36.69% -0.0131 -0.0677)
OKLCH	oklch(36.69% 0.069 259.1)
XYZ	xyz(4.9039, 4.9066, 12.4906)
Luminance	0.0491 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283F63 #634C28

analogous

#285D63 #283F63 #2F2863

triadic

#283F63 #63283F #3F6328

tetradic

#283F63 #63285D #634C28 #28632F

square

#283F63 #63285D #634C28 #28632F

split-complementary

#283F63 #632F28 #5D6328

monochromatic

#090E16 #162337 #283F63 #3A5B8F #4E77B7

Accessibility & contrast

On white

10.60

#283F63 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.98

#283F63 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283F63

10.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283F63	#FFFFFF	#000000	##FFFFFF
##283F63	1.00	10.60	1.98	10.60
#FFFFFF	10.60	1.00	21.00	1.00
#000000	1.98	21.00	1.00	21.00
##FFFFFF	10.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#304265

Deuteranopia (green-blind)

#293C62

Tritanopia (blue-blind)

#02474C

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #283f63;
/* rgb */ color: rgb(40, 63, 99);
/* oklch */ color: oklch(36.7% 0.069 259.1);

Tailwind

colors: {
  custom: {
    50: '#67738f',
    500: '#283f63',
    950: '#000000',
  },
}

SCSS

$custom: #283f63;
$custom-light: #67738f;
$custom-dark: #000000;

JSON

{
  "hex": "#283f63",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 99
  },
  "hsl": {
    "h": 216.61,
    "s": 42.446,
    "l": 27.255
  },
  "oklch": {
    "l": 0.36691,
    "c": 0.06891,
    "h": 259.1
  },
  "luminance": 0.04907
}

Semantic roles & 50–950 ramp

primary

#283F63

secondary

#967B51

accent

#A256D2

background

#F6F6F8

surface

#EBECF0

border

#C6C7CB

text

#06080C

muted

#7A7B7D

Preview Lab

Preview with #283F63

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

Preview Lab → · Contrast checker → · Palette generator →