#3F55BE#3F55BE

#3F55BE is a mid, vivid blue. Relative luminance 0.113; OKLCH L 49.3% C 0.166 H 270.3°. Best body text is #FFFFFF at 6.45:1 contrast (WCAG AA passes).

Color values

HEX	#3F55BE
RGB	rgb(63, 85, 190)
HSL	hsl(230, 50%, 50%)
HSV	hsv(230, 67%, 75%)
CMYK	cmyk(66.8%, 55.3%, 0%, 25.5%)
CIE-LAB	lab(40.03, 26.20, -57.81)
CIE-LCH	lch(40.03, 63.47, 294.38°)
OKLab	oklab(49.3% 0.0007 -0.1663)
OKLCH	oklch(49.3% 0.166 270.3)
XYZ	xyz(14.5895, 11.2701, 50.1117)
Luminance	0.1127 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F55BE #BEA83F

analogous

#3F95BE #3F55BE #683FBE

triadic

#3F55BE #BE3F55 #55BE3F

tetradic

#3F55BE #BE3F95 #BEA83F #3FBE68

square

#3F55BE #BE3F95 #BEA83F #3FBE68

split-complementary

#3F55BE #BE683F #95BE3F

monochromatic

#212C62 #304090 #3F55BE #6C7DCE #9AA6DD

Accessibility & contrast

On white

6.45

#3F55BE on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.25

#3F55BE on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F55BE

6.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F55BE	#FFFFFF	#000000	##FFFFFF
##3F55BE	1.00	6.45	3.25	6.45
#FFFFFF	6.45	1.00	21.00	1.00
#000000	3.25	21.00	1.00	21.00
##FFFFFF	6.45	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0064C2

Deuteranopia (green-blind)

#0059BC

Tritanopia (blue-blind)

#006E81

Achromatopsia (no color)

#5E5E5E

Design tokens & code

CSS

--color: #3f55be;
/* rgb */ color: rgb(63, 85, 190);
/* oklch */ color: oklch(49.3% 0.166 270.3);

Tailwind

colors: {
  custom: {
    50: '#8284d2',
    500: '#3f55be',
    950: '#000000',
  },
}

SCSS

$custom: #3f55be;
$custom-light: #8284d2;
$custom-dark: #000000;

JSON

{
  "hex": "#3f55be",
  "rgb": {
    "r": 63,
    "g": 85,
    "b": 190
  },
  "hsl": {
    "h": 229.606,
    "s": 50.198,
    "l": 49.608
  },
  "oklch": {
    "l": 0.493,
    "c": 0.16626,
    "h": 270.3
  },
  "luminance": 0.11271
}

Semantic roles & 50–950 ramp

primary

#3F55BE

secondary

#C9BF8F

accent

#C24EDA

background

#F8F8FD

surface

#F0EFFA

border

#CBCAD3

text

#0C0A14

muted

#7D7C83

Preview Lab

Preview with #3F55BE

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

Preview Lab → · Contrast checker → · Palette generator →