#3F78DD#3F78DD

#3F78DD is a mid, vivid blue. Relative luminance 0.197; OKLCH L 58.7% C 0.166 H 260.9°. Best body text is #000000 at 4.94:1 contrast (WCAG AA passes).

Color values

HEX	#3F78DD
RGB	rgb(63, 120, 221)
HSL	hsl(218, 70%, 56%)
HSV	hsv(218, 71%, 87%)
CMYK	cmyk(71.5%, 45.7%, 0%, 13.3%)
CIE-LAB	lab(51.51, 15.15, -57.08)
CIE-LCH	lch(51.51, 59.06, 284.87°)
OKLab	oklab(58.68% -0.0263 -0.1636)
OKLCH	oklch(58.68% 0.166 260.9)
XYZ	xyz(21.8128, 19.7078, 71.0470)
Luminance	0.1971 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F78DD #DDA43F

analogous

#3FC7DD #3F78DD #553FDD

triadic

#3F78DD #DD3F78 #78DD3F

tetradic

#3F78DD #DD3FC7 #DDA43F #3FDD55

square

#3F78DD #DD3FC7 #DDA43F #3FDD55

split-complementary

#3F78DD #DD553F #C7DD3F

monochromatic

#184189 #225ABD #3F78DD #739DE6 #A7C1EF

Accessibility & contrast

On white

4.25

#3F78DD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.94

#3F78DD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F78DD

4.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F78DD	#FFFFFF	#000000	##000000
##3F78DD	1.00	4.25	4.94	4.94
#FFFFFF	4.25	1.00	21.00	21.00
#000000	4.94	21.00	1.00	1.00
##000000	4.94	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4483E1

Deuteranopia (green-blind)

#2174DB

Tritanopia (blue-blind)

#0090A0

Achromatopsia (no color)

#7B7B7B

Design tokens & code

CSS

--color: #3f78dd;
/* rgb */ color: rgb(63, 120, 221);
/* oklch */ color: oklch(58.7% 0.166 260.9);

Tailwind

colors: {
  custom: {
    50: '#879ee8',
    500: '#3f78dd',
    950: '#000000',
  },
}

SCSS

$custom: #3f78dd;
$custom-light: #879ee8;
$custom-dark: #000000;

JSON

{
  "hex": "#3f78dd",
  "rgb": {
    "r": 63,
    "g": 120,
    "b": 221
  },
  "hsl": {
    "h": 218.354,
    "s": 69.912,
    "l": 55.686
  },
  "oklch": {
    "l": 0.58681,
    "c": 0.16568,
    "h": 260.9
  },
  "luminance": 0.1971
}

Semantic roles & 50–950 ramp

primary

#3F78DD

secondary

#DDC59B

accent

#AD3BED

background

#F9F9FE

surface

#F1F2FD

border

#CBCCD5

text

#0D0E16

muted

#7E7E84

Preview Lab

Preview with #3F78DD

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

Preview Lab → · Contrast checker → · Palette generator →