#3F81BD#3F81BD

#3F81BD is a mid, moderate cyan. Relative luminance 0.204; OKLCH L 58.7% C 0.114 H 248.4°. Best body text is #000000 at 5.09:1 contrast (WCAG AA passes).

Color values

HEX	#3F81BD
RGB	rgb(63, 129, 189)
HSL	hsl(209, 50%, 49%)
HSV	hsv(209, 67%, 74%)
CMYK	cmyk(66.7%, 31.7%, 0%, 25.9%)
CIE-LAB	lab(52.32, -1.71, -37.60)
CIE-LCH	lch(52.32, 37.64, 267.40°)
OKLab	oklab(58.75% -0.0421 -0.1064)
OKLCH	oklch(58.75% 0.114 248.4)
XYZ	xyz(19.0820, 20.4294, 51.0719)
Luminance	0.2043 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F81BD #BD7B3F

analogous

#3FBDBA #3F81BD #3F42BD

triadic

#3F81BD #BD3F81 #81BD3F

tetradic

#3F81BD #BA3FBD #BD7B3F #42BD3F

square

#3F81BD #BA3FBD #BD7B3F #42BD3F

split-complementary

#3F81BD #BD3F42 #BDBA3F

monochromatic

#204261 #30628F #3F81BD #6B9FCE #99BDDD

Accessibility & contrast

On white

4.13

#3F81BD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.09

#3F81BD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F81BD

5.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F81BD	#FFFFFF	#000000	##000000
##3F81BD	1.00	4.13	5.09	5.09
#FFFFFF	4.13	1.00	21.00	21.00
#000000	5.09	21.00	1.00	1.00
##000000	5.09	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6783C0

Deuteranopia (green-blind)

#5577BC

Tritanopia (blue-blind)

#008F96

Achromatopsia (no color)

#7D7D7D

Design tokens & code

CSS

--color: #3f81bd;
/* rgb */ color: rgb(63, 129, 189);
/* oklch */ color: oklch(58.7% 0.114 248.4);

Tailwind

colors: {
  custom: {
    50: '#81a5d1',
    500: '#3f81bd',
    950: '#000000',
  },
}

SCSS

$custom: #3f81bd;
$custom-light: #81a5d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f81bd",
  "rgb": {
    "r": 63,
    "g": 129,
    "b": 189
  },
  "hsl": {
    "h": 208.571,
    "s": 50,
    "l": 49.412
  },
  "oklch": {
    "l": 0.58748,
    "c": 0.11441,
    "h": 248.4
  },
  "luminance": 0.20431
}

Semantic roles & 50–950 ramp

primary

#3F81BD

secondary

#C9AB8F

accent

#914EDA

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0B0F14

muted

#7C7F82

Preview Lab

Preview with #3F81BD

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

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