#3F78D1#3F78D1

#3F78D1 is a mid, vivid blue. Relative luminance 0.191; OKLCH L 57.9% C 0.150 H 259.0°. Best body text is #000000 at 4.82:1 contrast (WCAG AA passes).

Color values

HEX	#3F78D1
RGB	rgb(63, 120, 209)
HSL	hsl(217, 61%, 53%)
HSV	hsv(217, 70%, 82%)
CMYK	cmyk(69.9%, 42.6%, 0%, 18%)
CIE-LAB	lab(50.79, 10.83, -51.43)
CIE-LCH	lch(50.79, 52.56, 281.89°)
OKLab	oklab(57.9% -0.0284 -0.147)
OKLCH	oklch(57.9% 0.15 259)
XYZ	xyz(20.2708, 19.0910, 62.9259)
Luminance	0.1909 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F78D1 #D1983F

analogous

#3FC1D1 #3F78D1 #4F3FD1

triadic

#3F78D1 #D13F78 #78D13F

tetradic

#3F78D1 #D13FC1 #D1983F #3FD14F

square

#3F78D1 #D13FC1 #D1983F #3FD14F

split-complementary

#3F78D1 #D14F3F #C1D13F

monochromatic

#1D4179 #295BAA #3F78D1 #709BDD #A2BDE9

Accessibility & contrast

On white

4.36

#3F78D1 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.82

#3F78D1 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F78D1

4.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F78D1	#FFFFFF	#000000	##000000
##3F78D1	1.00	4.36	4.82	4.82
#FFFFFF	4.36	1.00	21.00	21.00
#000000	4.82	21.00	1.00	1.00
##000000	4.82	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4D80D4

Deuteranopia (green-blind)

#3473CF

Tritanopia (blue-blind)

#008D9A

Achromatopsia (no color)

#797979

Design tokens & code

CSS

--color: #3f78d1;
/* rgb */ color: rgb(63, 120, 209);
/* oklch */ color: oklch(57.9% 0.150 259.0);

Tailwind

colors: {
  custom: {
    50: '#859edf',
    500: '#3f78d1',
    950: '#000000',
  },
}

SCSS

$custom: #3f78d1;
$custom-light: #859edf;
$custom-dark: #000000;

JSON

{
  "hex": "#3f78d1",
  "rgb": {
    "r": 63,
    "g": 120,
    "b": 209
  },
  "hsl": {
    "h": 216.575,
    "s": 61.345,
    "l": 53.333
  },
  "oklch": {
    "l": 0.57903,
    "c": 0.14969,
    "h": 259
  },
  "luminance": 0.19093
}

Semantic roles & 50–950 ramp

primary

#3F78D1

secondary

#D5BD97

accent

#A643E4

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F78D1

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

Preview Lab → · Contrast checker → · Palette generator →