#3F579E#3F579E

#3F579E is a mid, moderate blue. Relative luminance 0.103; OKLCH L 47.4% C 0.118 H 267.7°. Best body text is #FFFFFF at 6.84:1 contrast (WCAG AA passes).

Color values

HEX	#3F579E
RGB	rgb(63, 87, 158)
HSL	hsl(225, 43%, 43%)
HSV	hsv(225, 60%, 62%)
CMYK	cmyk(60.1%, 44.9%, 0%, 38%)
CIE-LAB	lab(38.45, 13.52, -41.44)
CIE-LCH	lch(38.45, 43.60, 288.07°)
OKLab	oklab(47.42% -0.0047 -0.1181)
OKLCH	oklch(47.42% 0.118 267.7)
XYZ	xyz(11.6276, 10.3408, 33.7244)
Luminance	0.1034 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F579E #9E863F

analogous

#3F869E #3F579E #563F9E

triadic

#3F579E #9E3F57 #579E3F

tetradic

#3F579E #9E3F86 #9E863F #3F9E56

square

#3F579E #9E3F86 #9E863F #3F9E56

split-complementary

#3F579E #9E563F #869E3F

monochromatic

#1C2746 #2E3F72 #3F579E #5C75BE #889AD0

Accessibility & contrast

On white

6.84

#3F579E on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.07

#3F579E on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F579E

6.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F579E	#FFFFFF	#000000	##FFFFFF
##3F579E	1.00	6.84	3.07	6.84
#FFFFFF	6.84	1.00	21.00	1.00
#000000	3.07	21.00	1.00	21.00
##FFFFFF	6.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#375FA1

Deuteranopia (green-blind)

#29579C

Tritanopia (blue-blind)

#006773

Achromatopsia (no color)

#5A5A5A

Design tokens & code

CSS

--color: #3f579e;
/* rgb */ color: rgb(63, 87, 158);
/* oklch */ color: oklch(47.4% 0.118 267.7);

Tailwind

colors: {
  custom: {
    50: '#7c86bb',
    500: '#3f579e',
    950: '#000000',
  },
}

SCSS

$custom: #3f579e;
$custom-light: #7c86bb;
$custom-dark: #000000;

JSON

{
  "hex": "#3f579e",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 158
  },
  "hsl": {
    "h": 224.842,
    "s": 42.986,
    "l": 43.333
  },
  "oklch": {
    "l": 0.47417,
    "c": 0.1182,
    "h": 267.7
  },
  "luminance": 0.10342
}

Semantic roles & 50–950 ramp

primary

#3F579E

secondary

#BAAB7F

accent

#B355D3

background

#F7F8FB

surface

#EEEFF6

border

#C9CAD0

text

#0A0B12

muted

#7C7C81

Preview Lab

Preview with #3F579E

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

Preview Lab → · Contrast checker → · Palette generator →