#3F81BF#3F81BF

#3F81BF is a mid, moderate cyan. Relative luminance 0.205; OKLCH L 58.9% C 0.117 H 249.2°. Best body text is #000000 at 5.10:1 contrast (WCAG AA passes).

Color values

HEX	#3F81BF
RGB	rgb(63, 129, 191)
HSL	hsl(209, 50%, 50%)
HSV	hsv(209, 67%, 75%)
CMYK	cmyk(67%, 32.5%, 0%, 25.1%)
CIE-LAB	lab(52.42, -1.01, -38.59)
CIE-LCH	lch(52.42, 38.61, 268.50°)
OKLab	oklab(58.86% -0.0415 -0.1093)
OKLCH	oklch(58.86% 0.117 249.2)
XYZ	xyz(19.3006, 20.5169, 52.2231)
Luminance	0.2052 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F81BF #BF7D3F

analogous

#3FBFBD #3F81BF #3F41BF

triadic

#3F81BF #BF3F81 #81BF3F

tetradic

#3F81BF #BD3FBF #BF7D3F #41BF3F

square

#3F81BF #BD3FBF #BF7D3F #41BF3F

split-complementary

#3F81BF #BF3F41 #BFBD3F

monochromatic

#214363 #306291 #3F81BF #6D9FCF #9BBDDE

Accessibility & contrast

On white

4.11

#3F81BF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.10

#3F81BF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F81BF

5.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F81BF	#FFFFFF	#000000	##000000
##3F81BF	1.00	4.11	5.10	5.10
#FFFFFF	4.11	1.00	21.00	21.00
#000000	5.10	21.00	1.00	1.00
##000000	5.10	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6684C2

Deuteranopia (green-blind)

#5478BE

Tritanopia (blue-blind)

#009097

Achromatopsia (no color)

#7D7D7D

Design tokens & code

CSS

--color: #3f81bf;
/* rgb */ color: rgb(63, 129, 191);
/* oklch */ color: oklch(58.9% 0.117 249.2);

Tailwind

colors: {
  custom: {
    50: '#81a5d2',
    500: '#3f81bf',
    950: '#000000',
  },
}

SCSS

$custom: #3f81bf;
$custom-light: #81a5d2;
$custom-dark: #000000;

JSON

{
  "hex": "#3f81bf",
  "rgb": {
    "r": 63,
    "g": 129,
    "b": 191
  },
  "hsl": {
    "h": 209.063,
    "s": 50.394,
    "l": 49.804
  },
  "oklch": {
    "l": 0.58856,
    "c": 0.11689,
    "h": 249.2
  },
  "luminance": 0.20519
}

Semantic roles & 50–950 ramp

primary

#3F81BF

secondary

#CAAC90

accent

#924EDA

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0B0F14

muted

#7C7F82

Preview Lab

Preview with #3F81BF

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

Preview Lab → · Contrast checker → · Palette generator →