#3581CB#3581CB

#3581CB is a mid, vivid cyan. Relative luminance 0.208; OKLCH L 59.2% C 0.136 H 250.8°. Best body text is #000000 at 5.15:1 contrast (WCAG AA passes).

Color values

HEX	#3581CB
RGB	rgb(53, 129, 203)
HSL	hsl(210, 59%, 50%)
HSV	hsv(210, 74%, 80%)
CMYK	cmyk(73.9%, 36.5%, 0%, 20.4%)
CIE-LAB	lab(52.69, 1.77, -45.02)
CIE-LCH	lch(52.69, 45.05, 272.25°)
OKLab	oklab(59.18% -0.0447 -0.1281)
OKLCH	oklch(59.18% 0.136 250.8)
XYZ	xyz(20.0939, 20.7669, 59.4377)
Luminance	0.2077 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3581CB #CB7F35

analogous

#35CBCA #3581CB #3536CB

triadic

#3581CB #CB3581 #81CB35

tetradic

#3581CB #CA35CB #CB7F35 #36CB35

square

#3581CB #CA35CB #CB7F35 #36CB35

split-complementary

#3581CB #CB3536 #CBCA35

monochromatic

#1B436A #28629B #3581CB #669FD8 #96BEE4

Accessibility & contrast

On white

4.07

#3581CB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.15

#3581CB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3581CB

5.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3581CB	#FFFFFF	#000000	##000000
##3581CB	1.00	4.07	5.15	5.15
#FFFFFF	4.07	1.00	21.00	21.00
#000000	5.15	21.00	1.00	1.00
##000000	5.15	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5F85CE

Deuteranopia (green-blind)

#4977CA

Tritanopia (blue-blind)

#00939C

Achromatopsia (no color)

#7E7E7E

Design tokens & code

CSS

--color: #3581cb;
/* rgb */ color: rgb(53, 129, 203);
/* oklch */ color: oklch(59.2% 0.136 250.8);

Tailwind

colors: {
  custom: {
    50: '#80a5db',
    500: '#3581cb',
    950: '#000000',
  },
}

SCSS

$custom: #3581cb;
$custom-light: #80a5db;
$custom-dark: #000000;

JSON

{
  "hex": "#3581cb",
  "rgb": {
    "r": 53,
    "g": 129,
    "b": 203
  },
  "hsl": {
    "h": 209.6,
    "s": 59.055,
    "l": 50.196
  },
  "oklch": {
    "l": 0.59179,
    "c": 0.13572,
    "h": 250.8
  },
  "luminance": 0.20769
}

Semantic roles & 50–950 ramp

primary

#3581CB

secondary

#CFAD8C

accent

#9346E2

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C0F15

muted

#7D7F83

Preview Lab

Preview with #3581CB

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

Preview Lab → · Contrast checker → · Palette generator →