#3F5FB3#3F5FB3

#3F5FB3 is a mid, vivid blue. Relative luminance 0.125; OKLCH L 50.5% C 0.138 H 265.9°. Best body text is #FFFFFF at 6.00:1 contrast (WCAG AA passes).

Color values

HEX	#3F5FB3
RGB	rgb(63, 95, 179)
HSL	hsl(223, 48%, 47%)
HSV	hsv(223, 65%, 70%)
CMYK	cmyk(64.8%, 46.9%, 0%, 29.8%)
CIE-LAB	lab(41.99, 15.82, -48.21)
CIE-LCH	lch(41.99, 50.74, 288.17°)
OKLab	oklab(50.55% -0.0098 -0.1379)
OKLCH	oklch(50.55% 0.138 265.9)
XYZ	xyz(14.2760, 12.4945, 44.2984)
Luminance	0.1250 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F5FB3 #B3933F

analogous

#3F99B3 #3F5FB3 #593FB3

triadic

#3F5FB3 #B33F5F #5FB33F

tetradic

#3F5FB3 #B33F99 #B3933F #3FB359

square

#3F5FB3 #B33F99 #B3933F #3FB359

split-complementary

#3F5FB3 #B3593F #99B33F

monochromatic

#1F2F58 #2F4786 #3F5FB3 #6681C9 #93A7D9

Accessibility & contrast

On white

6.00

#3F5FB3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.50

#3F5FB3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F5FB3

6.00:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F5FB3	#FFFFFF	#000000	##FFFFFF
##3F5FB3	1.00	6.00	3.50	6.00
#FFFFFF	6.00	1.00	21.00	1.00
#000000	3.50	21.00	1.00	21.00
##FFFFFF	6.00	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3569B6

Deuteranopia (green-blind)

#1F5EB1

Tritanopia (blue-blind)

#007280

Achromatopsia (no color)

#636363

Design tokens & code

CSS

--color: #3f5fb3;
/* rgb */ color: rgb(63, 95, 179);
/* oklch */ color: oklch(50.5% 0.138 265.9);

Tailwind

colors: {
  custom: {
    50: '#808cca',
    500: '#3f5fb3',
    950: '#000000',
  },
}

SCSS

$custom: #3f5fb3;
$custom-light: #808cca;
$custom-dark: #000000;

JSON

{
  "hex": "#3f5fb3",
  "rgb": {
    "r": 63,
    "g": 95,
    "b": 179
  },
  "hsl": {
    "h": 223.448,
    "s": 47.934,
    "l": 47.451
  },
  "oklch": {
    "l": 0.50548,
    "c": 0.13823,
    "h": 265.9
  },
  "luminance": 0.12496
}

Semantic roles & 50–950 ramp

primary

#3F5FB3

secondary

#C4B489

accent

#B250D8

background

#F8F8FC

surface

#EFF0F8

border

#CACBD1

text

#0B0C13

muted

#7C7D82

Preview Lab

Preview with #3F5FB3

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

Preview Lab → · Contrast checker → · Palette generator →