#3F558B#3F558B

#3F558B is a mid, moderate blue. Relative luminance 0.094; OKLCH L 45.8% C 0.093 H 266.1°. Best body text is #FFFFFF at 7.28:1 contrast (WCAG AA passes).

Color values

HEX	#3F558B
RGB	rgb(63, 85, 139)
HSL	hsl(223, 38%, 40%)
HSV	hsv(223, 55%, 55%)
CMYK	cmyk(54.7%, 38.8%, 0%, 45.5%)
CIE-LAB	lab(36.78, 8.22, -32.63)
CIE-LCH	lch(36.78, 33.65, 284.15°)
OKLab	oklab(45.78% -0.0063 -0.0923)
OKLCH	oklch(45.78% 0.093 266.1)
XYZ	xyz(9.9570, 9.4171, 25.7141)
Luminance	0.0942 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F558B #8B753F

analogous

#3F7B8B #3F558B #4F3F8B

triadic

#3F558B #8B3F55 #558B3F

tetradic

#3F558B #8B3F7B #8B753F #3F8B4F

square

#3F558B #8B3F7B #8B753F #3F8B4F

split-complementary

#3F558B #8B4F3F #7B8B3F

monochromatic

#192137 #2C3B61 #3F558B #5570B2 #7F93C5

Accessibility & contrast

On white

7.28

#3F558B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.88

#3F558B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F558B

7.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F558B	#FFFFFF	#000000	##FFFFFF
##3F558B	1.00	7.28	2.88	7.28
#FFFFFF	7.28	1.00	21.00	1.00
#000000	2.88	21.00	1.00	21.00
##FFFFFF	7.28	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3F5A8D

Deuteranopia (green-blind)

#37538A

Tritanopia (blue-blind)

#186169

Achromatopsia (no color)

#565656

Design tokens & code

CSS

--color: #3f558b;
/* rgb */ color: rgb(63, 85, 139);
/* oklch */ color: oklch(45.8% 0.093 266.1);

Tailwind

colors: {
  custom: {
    50: '#7a84ad',
    500: '#3f558b',
    950: '#000000',
  },
}

SCSS

$custom: #3f558b;
$custom-light: #7a84ad;
$custom-dark: #000000;

JSON

{
  "hex": "#3f558b",
  "rgb": {
    "r": 63,
    "g": 85,
    "b": 139
  },
  "hsl": {
    "h": 222.632,
    "s": 37.624,
    "l": 39.608
  },
  "oklch": {
    "l": 0.45775,
    "c": 0.09253,
    "h": 266.1
  },
  "luminance": 0.09418
}

Semantic roles & 50–950 ramp

primary

#3F558B

secondary

#AF9F76

accent

#AC5ACE

background

#F7F8FA

surface

#EEEFF4

border

#C9CACE

text

#090A10

muted

#7B7C7F

Preview Lab

Preview with #3F558B

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

Preview Lab → · Contrast checker → · Palette generator →