#3F81CB#3F81CB

#3F81CB is a mid, vivid cyan. Relative luminance 0.211; OKLCH L 59.5% C 0.132 H 253.1°. Best body text is #000000 at 5.21:1 contrast (WCAG AA passes).

Color values

HEX	#3F81CB
RGB	rgb(63, 129, 203)
HSL	hsl(212, 57%, 52%)
HSV	hsv(212, 69%, 80%)
CMYK	cmyk(69%, 36.5%, 0%, 20.4%)
CIE-LAB	lab(53.02, 3.20, -44.48)
CIE-LCH	lch(53.02, 44.59, 274.11°)
OKLab	oklab(59.53% -0.0383 -0.1264)
OKLCH	oklch(59.53% 0.132 253.1)
XYZ	xyz(20.6757, 21.0669, 59.4650)
Luminance	0.2107 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F81CB #CB893F

analogous

#3FC7CB #3F81CB #433FCB

triadic

#3F81CB #CB3F81 #81CB3F

tetradic

#3F81CB #CB3FC7 #CB893F #3FCB43

square

#3F81CB #CB3FC7 #CB893F #3FCB43

split-complementary

#3F81CB #CB433F #C7CB3F

monochromatic

#1F4571 #2C63A1 #3F81CB #6FA1D8 #9FC0E5

Accessibility & contrast

On white

4.03

#3F81CB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.21

#3F81CB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F81CB

5.21:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F81CB	#FFFFFF	#000000	##000000
##3F81CB	1.00	4.03	5.21	5.21
#FFFFFF	4.03	1.00	21.00	21.00
#000000	5.21	21.00	1.00	1.00
##000000	5.21	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6086CE

Deuteranopia (green-blind)

#4B79CA

Tritanopia (blue-blind)

#00929C

Achromatopsia (no color)

#7F7F7F

Design tokens & code

CSS

--color: #3f81cb;
/* rgb */ color: rgb(63, 129, 203);
/* oklch */ color: oklch(59.5% 0.132 253.1);

Tailwind

colors: {
  custom: {
    50: '#83a5db',
    500: '#3f81cb',
    950: '#000000',
  },
}

SCSS

$custom: #3f81cb;
$custom-light: #83a5db;
$custom-dark: #000000;

JSON

{
  "hex": "#3f81cb",
  "rgb": {
    "r": 63,
    "g": 129,
    "b": 203
  },
  "hsl": {
    "h": 211.714,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.59529,
    "c": 0.13211,
    "h": 253.1
  },
  "luminance": 0.21069
}

Semantic roles & 50–950 ramp

primary

#3F81CB

secondary

#D1B594

accent

#9847E1

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C0F15

muted

#7D7F83

Preview Lab

Preview with #3F81CB

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

Preview Lab → · Contrast checker → · Palette generator →