#3F55BC#3F55BC

#3F55BC is a mid, vivid blue. Relative luminance 0.112; OKLCH L 49.1% C 0.164 H 270.2°. Best body text is #FFFFFF at 6.49:1 contrast (WCAG AA passes).

Color values

HEX	#3F55BC
RGB	rgb(63, 85, 188)
HSL	hsl(229, 50%, 49%)
HSV	hsv(229, 66%, 74%)
CMYK	cmyk(66.5%, 54.8%, 0%, 26.3%)
CIE-LAB	lab(39.89, 25.48, -56.87)
CIE-LCH	lch(39.89, 62.32, 294.14°)
OKLab	oklab(49.15% 0.0006 -0.1635)
OKLCH	oklch(49.15% 0.164 270.2)
XYZ	xyz(14.3724, 11.1833, 48.9684)
Luminance	0.1119 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F55BC #BCA63F

analogous

#3F94BC #3F55BC #683FBC

triadic

#3F55BC #BC3F55 #55BC3F

tetradic

#3F55BC #BC3F94 #BCA63F #3FBC68

square

#3F55BC #BC3F94 #BCA63F #3FBC68

split-complementary

#3F55BC #BC683F #94BC3F

monochromatic

#202C60 #30408E #3F55BC #6B7CCD #99A5DD

Accessibility & contrast

On white

6.49

#3F55BC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.24

#3F55BC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F55BC

6.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F55BC	#FFFFFF	#000000	##FFFFFF
##3F55BC	1.00	6.49	3.24	6.49
#FFFFFF	6.49	1.00	21.00	1.00
#000000	3.24	21.00	1.00	21.00
##FFFFFF	6.49	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0164C0

Deuteranopia (green-blind)

#0059BA

Tritanopia (blue-blind)

#006E80

Achromatopsia (no color)

#5E5E5E

Design tokens & code

CSS

--color: #3f55bc;
/* rgb */ color: rgb(63, 85, 188);
/* oklch */ color: oklch(49.1% 0.164 270.2);

Tailwind

colors: {
  custom: {
    50: '#8284d1',
    500: '#3f55bc',
    950: '#000000',
  },
}

SCSS

$custom: #3f55bc;
$custom-light: #8284d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f55bc",
  "rgb": {
    "r": 63,
    "g": 85,
    "b": 188
  },
  "hsl": {
    "h": 229.44,
    "s": 49.801,
    "l": 49.216
  },
  "oklch": {
    "l": 0.49146,
    "c": 0.16351,
    "h": 270.2
  },
  "luminance": 0.11185
}

Semantic roles & 50–950 ramp

primary

#3F55BC

secondary

#C9BE8E

accent

#C14ED9

background

#F8F8FC

surface

#F0EFF9

border

#CBCAD2

text

#0C0A14

muted

#7D7C82

Preview Lab

Preview with #3F55BC

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

Preview Lab → · Contrast checker → · Palette generator →