#3F78C8#3F78C8

#3F78C8 is a mid, vivid blue. Relative luminance 0.187; OKLCH L 57.3% C 0.138 H 257.3°. Best body text is #000000 at 4.73:1 contrast (WCAG AA passes).

Color values

HEX	#3F78C8
RGB	rgb(63, 120, 200)
HSL	hsl(215, 55%, 52%)
HSV	hsv(215, 69%, 78%)
CMYK	cmyk(68.5%, 40%, 0%, 21.6%)
CIE-LAB	lab(50.28, 7.60, -47.11)
CIE-LCH	lch(50.28, 47.72, 279.17°)
OKLab	oklab(57.34% -0.0303 -0.1343)
OKLCH	oklch(57.34% 0.138 257.3)
XYZ	xyz(19.1879, 18.6579, 57.2225)
Luminance	0.1866 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F78C8 #C88F3F

analogous

#3FBDC8 #3F78C8 #4A3FC8

triadic

#3F78C8 #C83F78 #78C83F

tetradic

#3F78C8 #C83FBD #C88F3F #3FC84A

square

#3F78C8 #C83FBD #C88F3F #3FC84A

split-complementary

#3F78C8 #C84A3F #BDC83F

monochromatic

#1F406D #2D5C9D #3F78C8 #6F99D6 #9EBBE3

Accessibility & contrast

On white

4.44

#3F78C8 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.73

#3F78C8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F78C8

4.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F78C8	#FFFFFF	#000000	##000000
##3F78C8	1.00	4.44	4.73	4.73
#FFFFFF	4.44	1.00	21.00	21.00
#000000	4.73	21.00	1.00	1.00
##000000	4.73	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#537FCB

Deuteranopia (green-blind)

#3E72C6

Tritanopia (blue-blind)

#008B96

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #3f78c8;
/* rgb */ color: rgb(63, 120, 200);
/* oklch */ color: oklch(57.3% 0.138 257.3);

Tailwind

colors: {
  custom: {
    50: '#839ed9',
    500: '#3f78c8',
    950: '#000000',
  },
}

SCSS

$custom: #3f78c8;
$custom-light: #839ed9;
$custom-dark: #000000;

JSON

{
  "hex": "#3f78c8",
  "rgb": {
    "r": 63,
    "g": 120,
    "b": 200
  },
  "hsl": {
    "h": 215.036,
    "s": 55.466,
    "l": 51.569
  },
  "oklch": {
    "l": 0.57343,
    "c": 0.13767,
    "h": 257.3
  },
  "luminance": 0.1866
}

Semantic roles & 50–950 ramp

primary

#3F78C8

secondary

#D0B693

accent

#A049DF

background

#F8F9FD

surface

#F0F2FA

border

#CBCCD3

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F78C8

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

Preview Lab → · Contrast checker → · Palette generator →