#3F55AB#3F55AB

#3F55AB is a mid, vivid blue. Relative luminance 0.105; OKLCH L 47.9% C 0.140 H 269.7°. Best body text is #FFFFFF at 6.78:1 contrast (WCAG AA passes).

Color values

HEX	#3F55AB
RGB	rgb(63, 85, 171)
HSL	hsl(228, 46%, 46%)
HSV	hsv(228, 63%, 67%)
CMYK	cmyk(63.2%, 50.3%, 0%, 32.9%)
CIE-LAB	lab(38.71, 19.43, -48.76)
CIE-LCH	lch(38.71, 52.49, 291.72°)
OKLab	oklab(47.89% -0.0008 -0.1396)
OKLCH	oklch(47.89% 0.14 269.7)
XYZ	xyz(12.6466, 10.4929, 39.8791)
Luminance	0.1049 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F55AB #AB953F

analogous

#3F8BAB #3F55AB #5F3FAB

triadic

#3F55AB #AB3F55 #55AB3F

tetradic

#3F55AB #AB3F8B #AB953F #3FAB5F

square

#3F55AB #AB3F8B #AB953F #3FAB5F

split-complementary

#3F55AB #AB5F3F #8BAB3F

monochromatic

#1E2952 #2F3F7E #3F55AB #6276C5 #8F9DD6

Accessibility & contrast

On white

6.78

#3F55AB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.10

#3F55AB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F55AB

6.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F55AB	#FFFFFF	#000000	##FFFFFF
##3F55AB	1.00	6.78	3.10	6.78
#FFFFFF	6.78	1.00	21.00	1.00
#000000	3.10	21.00	1.00	21.00
##FFFFFF	6.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2660AE

Deuteranopia (green-blind)

#0C57A9

Tritanopia (blue-blind)

#006978

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #3f55ab;
/* rgb */ color: rgb(63, 85, 171);
/* oklch */ color: oklch(47.9% 0.140 269.7);

Tailwind

colors: {
  custom: {
    50: '#7f84c5',
    500: '#3f55ab',
    950: '#000000',
  },
}

SCSS

$custom: #3f55ab;
$custom-light: #7f84c5;
$custom-dark: #000000;

JSON

{
  "hex": "#3f55ab",
  "rgb": {
    "r": 63,
    "g": 85,
    "b": 171
  },
  "hsl": {
    "h": 227.778,
    "s": 46.154,
    "l": 45.882
  },
  "oklch": {
    "l": 0.47885,
    "c": 0.13964,
    "h": 269.7
  },
  "luminance": 0.10494
}

Semantic roles & 50–950 ramp

primary

#3F55AB

secondary

#C1B585

accent

#BB52D6

background

#F8F8FC

surface

#EFEFF8

border

#CACAD1

text

#0B0A13

muted

#7C7C82

Preview Lab

Preview with #3F55AB

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

Preview Lab → · Contrast checker → · Palette generator →