#3F579F#3F579F

#3F579F is a mid, moderate blue. Relative luminance 0.104; OKLCH L 47.5% C 0.120 H 267.8°. Best body text is #FFFFFF at 6.83:1 contrast (WCAG AA passes).

Color values

HEX	#3F579F
RGB	rgb(63, 87, 159)
HSL	hsl(225, 43%, 44%)
HSV	hsv(225, 60%, 62%)
CMYK	cmyk(60.4%, 45.3%, 0%, 37.6%)
CIE-LAB	lab(38.51, 13.88, -41.95)
CIE-LCH	lch(38.51, 44.18, 288.30°)
OKLab	oklab(47.48% -0.0046 -0.1196)
OKLCH	oklch(47.48% 0.12 267.8)
XYZ	xyz(11.7140, 10.3754, 34.1795)
Luminance	0.1038 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F579F #9F873F

analogous

#3F879F #3F579F #573F9F

triadic

#3F579F #9F3F57 #579F3F

tetradic

#3F579F #9F3F87 #9F873F #3F9F57

square

#3F579F #9F3F87 #9F873F #3F9F57

split-complementary

#3F579F #9F573F #879F3F

monochromatic

#1C2747 #2E3F73 #3F579F #5D75BF #889AD0

Accessibility & contrast

On white

6.83

#3F579F on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.08

#3F579F on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F579F

6.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F579F	#FFFFFF	#000000	##FFFFFF
##3F579F	1.00	6.83	3.08	6.83
#FFFFFF	6.83	1.00	21.00	1.00
#000000	3.08	21.00	1.00	21.00
##FFFFFF	6.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#365FA2

Deuteranopia (green-blind)

#28579D

Tritanopia (blue-blind)

#006773

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #3f579f;
/* rgb */ color: rgb(63, 87, 159);
/* oklch */ color: oklch(47.5% 0.120 267.8);

Tailwind

colors: {
  custom: {
    50: '#7d86bc',
    500: '#3f579f',
    950: '#000000',
  },
}

SCSS

$custom: #3f579f;
$custom-light: #7d86bc;
$custom-dark: #000000;

JSON

{
  "hex": "#3f579f",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 159
  },
  "hsl": {
    "h": 225,
    "s": 43.243,
    "l": 43.529
  },
  "oklch": {
    "l": 0.47483,
    "c": 0.11967,
    "h": 267.8
  },
  "luminance": 0.10376
}

Semantic roles & 50–950 ramp

primary

#3F579F

secondary

#BBAC7F

accent

#B355D3

background

#F7F8FB

surface

#EEEFF6

border

#C9CAD0

text

#0A0B12

muted

#7C7C81

Preview Lab

Preview with #3F579F

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

Preview Lab → · Contrast checker → · Palette generator →