#3991CC#3991CC

#3991CC is a light, vivid cyan. Relative luminance 0.255; OKLCH L 63.0% C 0.122 H 241.9°. Best body text is #000000 at 6.10:1 contrast (WCAG AA passes).

Color values

HEX	#3991CC
RGB	rgb(57, 145, 204)
HSL	hsl(204, 59%, 51%)
HSV	hsv(204, 72%, 80%)
CMYK	cmyk(72.1%, 28.9%, 0%, 20%)
CIE-LAB	lab(57.54, -6.72, -37.94)
CIE-LCH	lch(57.54, 38.53, 259.95°)
OKLab	oklab(63.04% -0.0573 -0.1072)
OKLCH	oklch(63.04% 0.122 241.9)
XYZ	xyz(22.7076, 25.4777, 60.8360)
Luminance	0.2548 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3991CC #CC7439

analogous

#39CCBE #3991CC #3947CC

triadic

#3991CC #CC3991 #91CC39

tetradic

#3991CC #BE39CC #CC7439 #47CC39

square

#3991CC #BE39CC #CC7439 #47CC39

split-complementary

#3991CC #CC3947 #CCBE39

monochromatic

#1C4D6E #29709F #3991CC #6AACD9 #9AC7E5

Accessibility & contrast

On white

3.44

#3991CC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.10

#3991CC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3991CC

6.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3991CC	#FFFFFF	#000000	##000000
##3991CC	1.00	3.44	6.10	6.10
#FFFFFF	3.44	1.00	21.00	21.00
#000000	6.10	21.00	1.00	1.00
##000000	6.10	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7692CF

Deuteranopia (green-blind)

#6284CB

Tritanopia (blue-blind)

#00A0A6

Achromatopsia (no color)

#8A8A8A

Design tokens & code

CSS

--color: #3991cc;
/* rgb */ color: rgb(57, 145, 204);
/* oklch */ color: oklch(63.0% 0.122 241.9);

Tailwind

colors: {
  custom: {
    50: '#82b1dc',
    500: '#3991cc',
    950: '#000000',
  },
}

SCSS

$custom: #3991cc;
$custom-light: #82b1dc;
$custom-dark: #000000;

JSON

{
  "hex": "#3991cc",
  "rgb": {
    "r": 57,
    "g": 145,
    "b": 204
  },
  "hsl": {
    "h": 204.082,
    "s": 59.036,
    "l": 51.176
  },
  "oklch": {
    "l": 0.63044,
    "c": 0.12157,
    "h": 241.9
  },
  "luminance": 0.2548
}

Semantic roles & 50–950 ramp

primary

#3991CC

secondary

#D1AA90

accent

#8446E2

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #3991CC

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

Preview Lab → · Contrast checker → · Palette generator →