#3F54B2#3F54B2

#3F54B2 is a mid, vivid blue. Relative luminance 0.106; OKLCH L 48.2% C 0.151 H 270.3°. Best body text is #FFFFFF at 6.73:1 contrast (WCAG AA passes).

Color values

HEX	#3F54B2
RGB	rgb(63, 84, 178)
HSL	hsl(229, 48%, 47%)
HSV	hsv(229, 65%, 70%)
CMYK	cmyk(64.6%, 52.8%, 0%, 30.2%)
CIE-LAB	lab(38.92, 22.57, -52.57)
CIE-LCH	lch(38.92, 57.21, 293.23°)
OKLab	oklab(48.19% 0.0009 -0.1509)
OKLCH	oklch(48.19% 0.151 270.3)
XYZ	xyz(13.2534, 10.6106, 43.4605)
Luminance	0.1061 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F54B2 #B29D3F

analogous

#3F8EB2 #3F54B2 #633FB2

triadic

#3F54B2 #B23F54 #54B23F

tetradic

#3F54B2 #B23F8E #B29D3F #3FB263

square

#3F54B2 #B23F8E #B29D3F #3FB263

split-complementary

#3F54B2 #B2633F #8EB23F

monochromatic

#1F2958 #2F3F85 #3F54B2 #6678C9 #939FD9

Accessibility & contrast

On white

6.73

#3F54B2 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.12

#3F54B2 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F54B2

6.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F54B2	#FFFFFF	#000000	##FFFFFF
##3F54B2	1.00	6.73	3.12	6.73
#FFFFFF	6.73	1.00	21.00	1.00
#000000	3.12	21.00	1.00	21.00
##FFFFFF	6.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1961B5

Deuteranopia (green-blind)

#0057B0

Tritanopia (blue-blind)

#006A7B

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #3f54b2;
/* rgb */ color: rgb(63, 84, 178);
/* oklch */ color: oklch(48.2% 0.151 270.3);

Tailwind

colors: {
  custom: {
    50: '#8083ca',
    500: '#3f54b2',
    950: '#000000',
  },
}

SCSS

$custom: #3f54b2;
$custom-light: #8083ca;
$custom-dark: #000000;

JSON

{
  "hex": "#3f54b2",
  "rgb": {
    "r": 63,
    "g": 84,
    "b": 178
  },
  "hsl": {
    "h": 229.043,
    "s": 47.718,
    "l": 47.255
  },
  "oklch": {
    "l": 0.48191,
    "c": 0.15087,
    "h": 270.3
  },
  "luminance": 0.10612
}

Semantic roles & 50–950 ramp

primary

#3F54B2

secondary

#C4B989

accent

#BF50D7

background

#F8F8FC

surface

#EFEFF8

border

#CACAD1

text

#0B0A13

muted

#7C7C82

Preview Lab

Preview with #3F54B2

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

Preview Lab → · Contrast checker → · Palette generator →