#3F78CC#3F78CC

#3F78CC is a mid, vivid blue. Relative luminance 0.188; OKLCH L 57.6% C 0.143 H 258.1°. Best body text is #000000 at 4.77:1 contrast (WCAG AA passes).

Color values

HEX	#3F78CC
RGB	rgb(63, 120, 204)
HSL	hsl(216, 58%, 52%)
HSV	hsv(216, 69%, 80%)
CMYK	cmyk(69.1%, 41.2%, 0%, 20%)
CIE-LAB	lab(50.51, 9.04, -49.04)
CIE-LCH	lch(50.51, 49.87, 280.44°)
OKLab	oklab(57.59% -0.0294 -0.1399)
OKLCH	oklch(57.59% 0.143 258.1)
XYZ	xyz(19.6615, 18.8473, 59.7167)
Luminance	0.1885 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F78CC #CC933F

analogous

#3FBECC #3F78CC #4D3FCC

triadic

#3F78CC #CC3F78 #78CC3F

tetradic

#3F78CC #CC3FBE #CC933F #3FCC4D

square

#3F78CC #CC3FBE #CC933F #3FCC4D

split-complementary

#3F78CC #CC4D3F #BECC3F

monochromatic

#1E4072 #2B5BA3 #3F78CC #6F9AD9 #A0BCE6

Accessibility & contrast

On white

4.40

#3F78CC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.77

#3F78CC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F78CC

4.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F78CC	#FFFFFF	#000000	##000000
##3F78CC	1.00	4.40	4.77	4.77
#FFFFFF	4.40	1.00	21.00	21.00
#000000	4.77	21.00	1.00	1.00
##000000	4.77	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#517FCF

Deuteranopia (green-blind)

#3A72CA

Tritanopia (blue-blind)

#008B98

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #3f78cc;
/* rgb */ color: rgb(63, 120, 204);
/* oklch */ color: oklch(57.6% 0.143 258.1);

Tailwind

colors: {
  custom: {
    50: '#849edc',
    500: '#3f78cc',
    950: '#000000',
  },
}

SCSS

$custom: #3f78cc;
$custom-light: #849edc;
$custom-dark: #000000;

JSON

{
  "hex": "#3f78cc",
  "rgb": {
    "r": 63,
    "g": 120,
    "b": 204
  },
  "hsl": {
    "h": 215.745,
    "s": 58.025,
    "l": 52.353
  },
  "oklch": {
    "l": 0.57589,
    "c": 0.14301,
    "h": 258.1
  },
  "luminance": 0.18849
}

Semantic roles & 50–950 ramp

primary

#3F78CC

secondary

#D2B995

accent

#A347E1

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F78CC

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

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