#3981CB#3981CB

#3981CB is a mid, vivid cyan. Relative luminance 0.209; OKLCH L 59.3% C 0.134 H 251.7°. Best body text is #000000 at 5.18:1 contrast (WCAG AA passes).

Color values

HEX	#3981CB
RGB	rgb(57, 129, 203)
HSL	hsl(210, 58%, 51%)
HSV	hsv(210, 72%, 80%)
CMYK	cmyk(71.9%, 36.5%, 0%, 20.4%)
CIE-LAB	lab(52.82, 2.31, -44.81)
CIE-LCH	lch(52.82, 44.87, 272.95°)
OKLab	oklab(59.31% -0.0423 -0.1275)
OKLCH	oklch(59.31% 0.134 251.7)
XYZ	xyz(20.3131, 20.8799, 59.4480)
Luminance	0.2088 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3981CB #CB8339

analogous

#39CACB #3981CB #3A39CB

triadic

#3981CB #CB3981 #81CB39

tetradic

#3981CB #CB39CA #CB8339 #39CB3A

square

#3981CB #CB39CA #CB8339 #39CB3A

split-complementary

#3981CB #CB3A39 #CACB39

monochromatic

#1D446D #29639D #3981CB #69A0D8 #9ABFE4

Accessibility & contrast

On white

4.06

#3981CB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.18

#3981CB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3981CB

5.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3981CB	#FFFFFF	#000000	##000000
##3981CB	1.00	4.06	5.18	5.18
#FFFFFF	4.06	1.00	21.00	21.00
#000000	5.18	21.00	1.00	1.00
##000000	5.18	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: #3981cb;
/* rgb */ color: rgb(57, 129, 203);
/* oklch */ color: oklch(59.3% 0.134 251.7);

Tailwind

colors: {
  custom: {
    50: '#81a5db',
    500: '#3981cb',
    950: '#000000',
  },
}

SCSS

$custom: #3981cb;
$custom-light: #81a5db;
$custom-dark: #000000;

JSON

{
  "hex": "#3981cb",
  "rgb": {
    "r": 57,
    "g": 129,
    "b": 203
  },
  "hsl": {
    "h": 210.411,
    "s": 58.4,
    "l": 50.98
  },
  "oklch": {
    "l": 0.59312,
    "c": 0.13432,
    "h": 251.7
  },
  "luminance": 0.20882
}

Semantic roles & 50–950 ramp

primary

#3981CB

secondary

#D0B090

accent

#9546E2

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C0F15

muted

#7D7F83

Preview Lab

Preview with #3981CB

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

Preview Lab → · Contrast checker → · Palette generator →