#3F577F#3F577F

#3F577F is a mid, moderate blue. Relative luminance 0.094; OKLCH L 45.6% C 0.072 H 260.3°. Best body text is #FFFFFF at 7.29:1 contrast (WCAG AA passes).

Color values

HEX	#3F577F
RGB	rgb(63, 87, 127)
HSL	hsl(218, 34%, 37%)
HSV	hsv(218, 50%, 50%)
CMYK	cmyk(50.4%, 31.5%, 0%, 50.2%)
CIE-LAB	lab(36.75, 2.92, -25.33)
CIE-LCH	lch(36.75, 25.50, 276.57°)
OKLab	oklab(45.55% -0.0122 -0.0711)
OKLCH	oklch(45.55% 0.072 260.3)
XYZ	xyz(9.2876, 9.4048, 21.4005)
Luminance	0.0940 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F577F #7F673F

analogous

#3F777F #3F577F #473F7F

triadic

#3F577F #7F3F57 #577F3F

tetradic

#3F577F #7F3F77 #7F673F #3F7F47

square

#3F577F #7F3F77 #7F673F #3F7F47

split-complementary

#3F577F #7F473F #777F3F

monochromatic

#161F2D #2B3B56 #3F577F #5373A8 #7B94BD

Accessibility & contrast

On white

7.29

#3F577F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.88

#3F577F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F577F

7.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F577F	#FFFFFF	#000000	##FFFFFF
##3F577F	1.00	7.29	2.88	7.29
#FFFFFF	7.29	1.00	21.00	1.00
#000000	2.88	21.00	1.00	21.00
##FFFFFF	7.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#485A81

Deuteranopia (green-blind)

#40547E

Tritanopia (blue-blind)

#236065

Achromatopsia (no color)

#565656

Design tokens & code

CSS

--color: #3f577f;
/* rgb */ color: rgb(63, 87, 127);
/* oklch */ color: oklch(45.6% 0.072 260.3);

Tailwind

colors: {
  custom: {
    50: '#7886a4',
    500: '#3f577f',
    950: '#000000',
  },
}

SCSS

$custom: #3f577f;
$custom-light: #7886a4;
$custom-dark: #000000;

JSON

{
  "hex": "#3f577f",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 127
  },
  "hsl": {
    "h": 217.5,
    "s": 33.684,
    "l": 37.255
  },
  "oklch": {
    "l": 0.45554,
    "c": 0.0721,
    "h": 260.3
  },
  "luminance": 0.09405
}

Semantic roles & 50–950 ramp

primary

#3F577F

secondary

#A89472

accent

#A15ECA

background

#F7F8FA

surface

#EDEFF4

border

#C8CACE

text

#090B0F

muted

#7B7C7F

Preview Lab

Preview with #3F577F

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

Preview Lab → · Contrast checker → · Palette generator →