#3F71C9#3F71C9

#3F71C9 is a mid, vivid blue. Relative luminance 0.171; OKLCH L 55.9% C 0.147 H 260.8°. Best body text is #FFFFFF at 4.75:1 contrast (WCAG AA passes).

Color values

HEX	#3F71C9
RGB	rgb(63, 113, 201)
HSL	hsl(218, 56%, 52%)
HSV	hsv(218, 69%, 79%)
CMYK	cmyk(68.7%, 43.8%, 0%, 21.2%)
CIE-LAB	lab(48.36, 12.31, -50.75)
CIE-LCH	lch(48.36, 52.22, 283.63°)
OKLab	oklab(55.88% -0.0235 -0.1451)
OKLCH	oklch(55.88% 0.147 260.8)
XYZ	xyz(18.4939, 17.0822, 57.5696)
Luminance	0.1708 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F71C9 #C9973F

analogous

#3FB6C9 #3F71C9 #523FC9

triadic

#3F71C9 #C93F71 #71C93F

tetradic

#3F71C9 #C93FB6 #C9973F #3FC952

square

#3F71C9 #C93FB6 #C9973F #3FC952

split-complementary

#3F71C9 #C9523F #B6C93F

monochromatic

#1F3C6F #2D569E #3F71C9 #6F94D6 #9FB8E4

Accessibility & contrast

On white

4.75

#3F71C9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.42

#3F71C9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F71C9

4.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F71C9	#FFFFFF	#000000	##FFFFFF
##3F71C9	1.00	4.75	4.42	4.75
#FFFFFF	4.75	1.00	21.00	1.00
#000000	4.42	21.00	1.00	21.00
##FFFFFF	4.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#467ACC

Deuteranopia (green-blind)

#2E6DC7

Tritanopia (blue-blind)

#008593

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #3f71c9;
/* rgb */ color: rgb(63, 113, 201);
/* oklch */ color: oklch(55.9% 0.147 260.8);

Tailwind

colors: {
  custom: {
    50: '#8399da',
    500: '#3f71c9',
    950: '#000000',
  },
}

SCSS

$custom: #3f71c9;
$custom-light: #8399da;
$custom-dark: #000000;

JSON

{
  "hex": "#3f71c9",
  "rgb": {
    "r": 63,
    "g": 113,
    "b": 201
  },
  "hsl": {
    "h": 218.261,
    "s": 56.098,
    "l": 51.765
  },
  "oklch": {
    "l": 0.55875,
    "c": 0.14696,
    "h": 260.8
  },
  "luminance": 0.17084
}

Semantic roles & 50–950 ramp

primary

#3F71C9

secondary

#D0BA94

accent

#A948DF

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #3F71C9

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

Preview Lab → · Contrast checker → · Palette generator →