#3F78BB#3F78BB

#3F78BB is a mid, vivid cyan. Relative luminance 0.181; OKLCH L 56.6% C 0.120 H 253.9°. Best body text is #000000 at 4.62:1 contrast (WCAG AA passes).

Color values

HEX	#3F78BB
RGB	rgb(63, 120, 187)
HSL	hsl(212, 50%, 49%)
HSV	hsv(212, 66%, 73%)
CMYK	cmyk(66.3%, 35.8%, 0%, 26.7%)
CIE-LAB	lab(49.59, 3.00, -40.76)
CIE-LCH	lch(49.59, 40.87, 274.20°)
OKLab	oklab(56.57% -0.0334 -0.1157)
OKLCH	oklch(56.57% 0.12 253.9)
XYZ	xyz(17.7327, 18.0758, 49.5585)
Luminance	0.1808 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F78BB #BB823F

analogous

#3FB6BB #3F78BB #443FBB

triadic

#3F78BB #BB3F78 #78BB3F

tetradic

#3F78BB #BB3FB6 #BB823F #3FBB44

square

#3F78BB #BB3FB6 #BB823F #3FBB44

split-complementary

#3F78BB #BB443F #B6BB3F

monochromatic

#203D5F #305B8D #3F78BB #6A98CD #98B7DC

Accessibility & contrast

On white

4.55

#3F78BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.62

#3F78BB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F78BB

4.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F78BB	#FFFFFF	#000000	##000000
##3F78BB	1.00	4.55	4.62	4.62
#FFFFFF	4.55	1.00	21.00	21.00
#000000	4.62	21.00	1.00	1.00
##000000	4.62	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5B7CBE

Deuteranopia (green-blind)

#4971BA

Tritanopia (blue-blind)

#008891

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #3f78bb;
/* rgb */ color: rgb(63, 120, 187);
/* oklch */ color: oklch(56.6% 0.120 253.9);

Tailwind

colors: {
  custom: {
    50: '#819ed0',
    500: '#3f78bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f78bb;
$custom-light: #819ed0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f78bb",
  "rgb": {
    "r": 63,
    "g": 120,
    "b": 187
  },
  "hsl": {
    "h": 212.419,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.56573,
    "c": 0.12043,
    "h": 253.9
  },
  "luminance": 0.18078
}

Semantic roles & 50–950 ramp

primary

#3F78BB

secondary

#C8AD8E

accent

#994FD9

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0E14

muted

#7C7E82

Preview Lab

Preview with #3F78BB

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

Preview Lab → · Contrast checker → · Palette generator →