#3B81CB#3B81CB

#3B81CB is a mid, vivid cyan. Relative luminance 0.209; OKLCH L 59.4% C 0.134 H 252.1°. Best body text is #000000 at 5.19:1 contrast (WCAG AA passes).

Color values

HEX	#3B81CB
RGB	rgb(59, 129, 203)
HSL	hsl(211, 58%, 51%)
HSV	hsv(211, 71%, 80%)
CMYK	cmyk(70.9%, 36.5%, 0%, 20.4%)
CIE-LAB	lab(52.88, 2.60, -44.70)
CIE-LCH	lch(52.88, 44.78, 273.32°)
OKLab	oklab(59.38% -0.041 -0.1272)
OKLCH	oklch(59.38% 0.134 252.1)
XYZ	xyz(20.4294, 20.9399, 59.4535)
Luminance	0.2094 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3B81CB #CB853B

analogous

#3BC9CB #3B81CB #3D3BCB

triadic

#3B81CB #CB3B81 #81CB3B

tetradic

#3B81CB #CB3BC9 #CB853B #3BCB3D

square

#3B81CB #CB3BC9 #CB853B #3BCB3D

split-complementary

#3B81CB #CB3D3B #C9CB3B

monochromatic

#1D456E #2A639F #3B81CB #6BA0D8 #9CBFE5

Accessibility & contrast

On white

4.05

#3B81CB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.19

#3B81CB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3B81CB

5.19:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3B81CB	#FFFFFF	#000000	##000000
##3B81CB	1.00	4.05	5.19	5.19
#FFFFFF	4.05	1.00	21.00	21.00
#000000	5.19	21.00	1.00	1.00
##000000	5.19	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5F86CE

Deuteranopia (green-blind)

#4A78CA

Tritanopia (blue-blind)

#00929C

Achromatopsia (no color)

#7E7E7E

Design tokens & code

CSS

--color: #3b81cb;
/* rgb */ color: rgb(59, 129, 203);
/* oklch */ color: oklch(59.4% 0.134 252.1);

Tailwind

colors: {
  custom: {
    50: '#82a5db',
    500: '#3b81cb',
    950: '#000000',
  },
}

SCSS

$custom: #3b81cb;
$custom-light: #82a5db;
$custom-dark: #000000;

JSON

{
  "hex": "#3b81cb",
  "rgb": {
    "r": 59,
    "g": 129,
    "b": 203
  },
  "hsl": {
    "h": 210.833,
    "s": 58.065,
    "l": 51.373
  },
  "oklch": {
    "l": 0.59382,
    "c": 0.1336,
    "h": 252.1
  },
  "luminance": 0.20942
}

Semantic roles & 50–950 ramp

primary

#3B81CB

secondary

#D1B291

accent

#9647E1

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C0F15

muted

#7D7F83

Preview Lab

Preview with #3B81CB

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

Preview Lab → · Contrast checker → · Palette generator →