#3F81BB#3F81BB

#3F81BB is a mid, moderate cyan. Relative luminance 0.203; OKLCH L 58.6% C 0.112 H 247.6°. Best body text is #000000 at 5.07:1 contrast (WCAG AA passes).

Color values

HEX	#3F81BB
RGB	rgb(63, 129, 187)
HSL	hsl(208, 50%, 49%)
HSV	hsv(208, 66%, 73%)
CMYK	cmyk(66.3%, 31%, 0%, 26.7%)
CIE-LAB	lab(52.22, -2.40, -36.61)
CIE-LCH	lch(52.22, 36.69, 266.25°)
OKLab	oklab(58.64% -0.0427 -0.1035)
OKLCH	oklch(58.64% 0.112 247.6)
XYZ	xyz(18.8664, 20.3432, 49.9364)
Luminance	0.2034 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F81BB #BB793F

analogous

#3FBBB7 #3F81BB #3F43BB

triadic

#3F81BB #BB3F81 #81BB3F

tetradic

#3F81BB #B73FBB #BB793F #43BB3F

square

#3F81BB #B73FBB #BB793F #43BB3F

split-complementary

#3F81BB #BB3F43 #BBB73F

monochromatic

#20425F #30618D #3F81BB #6A9FCD #98BCDC

Accessibility & contrast

On white

4.14

#3F81BB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.07

#3F81BB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F81BB

5.07:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F81BB	#FFFFFF	#000000	##000000
##3F81BB	1.00	4.14	5.07	5.07
#FFFFFF	4.14	1.00	21.00	21.00
#000000	5.07	21.00	1.00	1.00
##000000	5.07	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6783BE

Deuteranopia (green-blind)

#5677BA

Tritanopia (blue-blind)

#008F96

Achromatopsia (no color)

#7D7D7D

Design tokens & code

CSS

--color: #3f81bb;
/* rgb */ color: rgb(63, 129, 187);
/* oklch */ color: oklch(58.6% 0.112 247.6);

Tailwind

colors: {
  custom: {
    50: '#81a5cf',
    500: '#3f81bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f81bb;
$custom-light: #81a5cf;
$custom-dark: #000000;

JSON

{
  "hex": "#3f81bb",
  "rgb": {
    "r": 63,
    "g": 129,
    "b": 187
  },
  "hsl": {
    "h": 208.065,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.5864,
    "c": 0.11195,
    "h": 247.6
  },
  "luminance": 0.20345
}

Semantic roles & 50–950 ramp

primary

#3F81BB

secondary

#C8A98E

accent

#8F4FD9

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0B0F14

muted

#7C7F82

Preview Lab

Preview with #3F81BB

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

Preview Lab → · Contrast checker → · Palette generator →