#3F558D#3F558D

#3F558D is a mid, moderate blue. Relative luminance 0.095; OKLCH L 45.9% C 0.096 H 266.5°. Best body text is #FFFFFF at 7.25:1 contrast (WCAG AA passes).

Color values

HEX	#3F558D
RGB	rgb(63, 85, 141)
HSL	hsl(223, 38%, 40%)
HSV	hsv(223, 55%, 55%)
CMYK	cmyk(55.3%, 39.7%, 0%, 44.7%)
CIE-LAB	lab(36.89, 8.91, -33.67)
CIE-LCH	lch(36.89, 34.83, 284.82°)
OKLab	oklab(45.9% -0.0058 -0.0954)
OKLCH	oklch(45.9% 0.096 266.5)
XYZ	xyz(10.1045, 9.4761, 26.4907)
Luminance	0.0948 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F558D #8D773F

analogous

#3F7C8D #3F558D #503F8D

triadic

#3F558D #8D3F55 #558D3F

tetradic

#3F558D #8D3F7C #8D773F #3F8D50

square

#3F558D #8D3F7C #8D773F #3F8D50

split-complementary

#3F558D #8D503F #7C8D3F

monochromatic

#192238 #2C3C63 #3F558D #5670B3 #8094C6

Accessibility & contrast

On white

7.25

#3F558D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.90

#3F558D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F558D

7.25:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F558D	#FFFFFF	#000000	##FFFFFF
##3F558D	1.00	7.25	2.90	7.25
#FFFFFF	7.25	1.00	21.00	1.00
#000000	2.90	21.00	1.00	21.00
##FFFFFF	7.25	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3E5B8F

Deuteranopia (green-blind)

#35548C

Tritanopia (blue-blind)

#16616A

Achromatopsia (no color)

#575757

Design tokens & code

CSS

--color: #3f558d;
/* rgb */ color: rgb(63, 85, 141);
/* oklch */ color: oklch(45.9% 0.096 266.5);

Tailwind

colors: {
  custom: {
    50: '#7a84ae',
    500: '#3f558d',
    950: '#000000',
  },
}

SCSS

$custom: #3f558d;
$custom-light: #7a84ae;
$custom-dark: #000000;

JSON

{
  "hex": "#3f558d",
  "rgb": {
    "r": 63,
    "g": 85,
    "b": 141
  },
  "hsl": {
    "h": 223.077,
    "s": 38.235,
    "l": 40
  },
  "oklch": {
    "l": 0.45896,
    "c": 0.09554,
    "h": 266.5
  },
  "luminance": 0.09477
}

Semantic roles & 50–950 ramp

primary

#3F558D

secondary

#B1A077

accent

#AD5ACE

background

#F7F8FA

surface

#EEEFF4

border

#C9CACE

text

#0A0A10

muted

#7C7C7F

Preview Lab

Preview with #3F558D

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

Preview Lab → · Contrast checker → · Palette generator →