#3F54BB#3F54BB

#3F54BB is a mid, vivid blue. Relative luminance 0.110; OKLCH L 48.9% C 0.163 H 270.5°. Best body text is #FFFFFF at 6.57:1 contrast (WCAG AA passes).

Color values

HEX	#3F54BB
RGB	rgb(63, 84, 187)
HSL	hsl(230, 50%, 49%)
HSV	hsv(230, 66%, 73%)
CMYK	cmyk(66.3%, 55.1%, 0%, 26.7%)
CIE-LAB	lab(39.55, 25.77, -56.83)
CIE-LCH	lch(39.55, 62.40, 294.39°)
OKLab	oklab(48.87% 0.0015 -0.1634)
OKLCH	oklch(48.87% 0.163 270.5)
XYZ	xyz(14.1868, 10.9840, 48.3766)
Luminance	0.1099 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F54BB #BBA63F

analogous

#3F92BB #3F54BB #683FBB

triadic

#3F54BB #BB3F54 #54BB3F

tetradic

#3F54BB #BB3F92 #BBA63F #3FBB68

square

#3F54BB #BB3F92 #BBA63F #3FBB68

split-complementary

#3F54BB #BB683F #92BB3F

monochromatic

#202B5F #303F8D #3F54BB #6A7BCD #98A4DC

Accessibility & contrast

On white

6.57

#3F54BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.20

#3F54BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F54BB

6.57:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F54BB	#FFFFFF	#000000	##FFFFFF
##3F54BB	1.00	6.57	3.20	6.57
#FFFFFF	6.57	1.00	21.00	1.00
#000000	3.20	21.00	1.00	21.00
##FFFFFF	6.57	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0063BF

Deuteranopia (green-blind)

#0058B9

Tritanopia (blue-blind)

#006D7F

Achromatopsia (no color)

#5D5D5D

Design tokens & code

CSS

--color: #3f54bb;
/* rgb */ color: rgb(63, 84, 187);
/* oklch */ color: oklch(48.9% 0.163 270.5);

Tailwind

colors: {
  custom: {
    50: '#8283d0',
    500: '#3f54bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f54bb;
$custom-light: #8283d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f54bb",
  "rgb": {
    "r": 63,
    "g": 84,
    "b": 187
  },
  "hsl": {
    "h": 229.839,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.48872,
    "c": 0.1634,
    "h": 270.5
  },
  "luminance": 0.10985
}

Semantic roles & 50–950 ramp

primary

#3F54BB

secondary

#C8BE8E

accent

#C24FD9

background

#F8F8FC

surface

#F0EFF9

border

#CBCAD2

text

#0C0A14

muted

#7D7C82

Preview Lab

Preview with #3F54BB

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

Preview Lab → · Contrast checker → · Palette generator →