#3F577B#3F577B

#3F577B is a mid, moderate blue. Relative luminance 0.093; OKLCH L 45.3% C 0.066 H 258.3°. Best body text is #FFFFFF at 7.34:1 contrast (WCAG AA passes).

Color values

HEX	#3F577B
RGB	rgb(63, 87, 123)
HSL	hsl(216, 32%, 36%)
HSV	hsv(216, 49%, 48%)
CMYK	cmyk(48.8%, 29.3%, 0%, 51.8%)
CIE-LAB	lab(36.56, 1.61, -23.17)
CIE-LCH	lch(36.56, 23.23, 273.98°)
OKLab	oklab(45.34% -0.0134 -0.0648)
OKLCH	oklch(45.34% 0.066 258.3)
XYZ	xyz(9.0321, 9.3026, 20.0547)
Luminance	0.0930 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F577B #7B633F

analogous

#3F757B #3F577B #453F7B

triadic

#3F577B #7B3F57 #577B3F

tetradic

#3F577B #7B3F75 #7B633F #3F7B45

square

#3F577B #7B3F75 #7B633F #3F7B45

split-complementary

#3F577B #7B453F #757B3F

monochromatic

#161E2A #2A3A53 #3F577B #5474A3 #7A94BB

Accessibility & contrast

On white

7.34

#3F577B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.86

#3F577B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F577B

7.34:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F577B	#FFFFFF	#000000	##FFFFFF
##3F577B	1.00	7.34	2.86	7.34
#FFFFFF	7.34	1.00	21.00	1.00
#000000	2.86	21.00	1.00	21.00
##FFFFFF	7.34	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#49597D

Deuteranopia (green-blind)

#42537A

Tritanopia (blue-blind)

#265F64

Achromatopsia (no color)

#565656

Design tokens & code

CSS

--color: #3f577b;
/* rgb */ color: rgb(63, 87, 123);
/* oklch */ color: oklch(45.3% 0.066 258.3);

Tailwind

colors: {
  custom: {
    50: '#7786a1',
    500: '#3f577b',
    950: '#000000',
  },
}

SCSS

$custom: #3f577b;
$custom-light: #7786a1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f577b",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 123
  },
  "hsl": {
    "h": 216,
    "s": 32.258,
    "l": 36.471
  },
  "oklch": {
    "l": 0.45341,
    "c": 0.06621,
    "h": 258.3
  },
  "luminance": 0.09303
}

Semantic roles & 50–950 ramp

primary

#3F577B

secondary

#A59071

accent

#9E5FC8

background

#F7F8F9

surface

#EDEFF2

border

#C8CACC

text

#090B0F

muted

#7B7C7E

Preview Lab

Preview with #3F577B

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

Preview Lab → · Contrast checker → · Palette generator →