#3F71E3#3F71E3

#3F71E3 is a mid, vivid blue. Relative luminance 0.184; OKLCH L 57.6% C 0.182 H 263.8°. Best body text is #000000 at 4.68:1 contrast (WCAG AA passes).

Color values

HEX	#3F71E3
RGB	rgb(63, 113, 227)
HSL	hsl(222, 75%, 57%)
HSV	hsv(222, 72%, 89%)
CMYK	cmyk(72.2%, 50.2%, 0%, 11%)
CIE-LAB	lab(49.99, 21.69, -62.90)
CIE-LCH	lch(49.99, 66.54, 289.03°)
OKLab	oklab(57.64% -0.0196 -0.1808)
OKLCH	oklch(57.64% 0.182 263.8)
XYZ	xyz(21.8152, 18.4107, 75.0621)
Luminance	0.1841 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F71E3 #E3B13F

analogous

#3FC3E3 #3F71E3 #5F3FE3

triadic

#3F71E3 #E33F71 #71E33F

tetradic

#3F71E3 #E33FC3 #E3B13F #3FE35F

square

#3F71E3 #E33FC3 #E3B13F #3FE35F

split-complementary

#3F71E3 #E35F3F #C3E33F

monochromatic

#153B92 #1D51C8 #3F71E3 #7499EB #AAC0F3

Accessibility & contrast

On white

4.48

#3F71E3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.68

#3F71E3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F71E3

4.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F71E3	#FFFFFF	#000000	##000000
##3F71E3	1.00	4.48	4.68	4.68
#FFFFFF	4.48	1.00	21.00	21.00
#000000	4.68	21.00	1.00	1.00
##000000	4.68	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#2B7FE7

Deuteranopia (green-blind)

#0070E1

Tritanopia (blue-blind)

#008C9F

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #3f71e3;
/* rgb */ color: rgb(63, 113, 227);
/* oklch */ color: oklch(57.6% 0.182 263.8);

Tailwind

colors: {
  custom: {
    50: '#8899ec',
    500: '#3f71e3',
    950: '#000000',
  },
}

SCSS

$custom: #3f71e3;
$custom-light: #8899ec;
$custom-dark: #000000;

JSON

{
  "hex": "#3f71e3",
  "rgb": {
    "r": 63,
    "g": 113,
    "b": 227
  },
  "hsl": {
    "h": 221.707,
    "s": 74.545,
    "l": 56.863
  },
  "oklch": {
    "l": 0.57644,
    "c": 0.18188,
    "h": 263.8
  },
  "luminance": 0.18413
}

Semantic roles & 50–950 ramp

primary

#3F71E3

secondary

#E0CC9D

accent

#B837F1

background

#F9F9FE

surface

#F1F2FD

border

#CBCCD5

text

#0D0D16

muted

#7E7E84

Preview Lab

Preview with #3F71E3

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

Preview Lab → · Contrast checker → · Palette generator →