#3991DB#3991DB

#3991DB is a light, vivid cyan. Relative luminance 0.262; OKLCH L 63.8% C 0.139 H 247.6°. Best body text is #000000 at 6.25:1 contrast (WCAG AA passes).

Color values

HEX	#3991DB
RGB	rgb(57, 145, 219)
HSL	hsl(207, 69%, 54%)
HSV	hsv(207, 74%, 86%)
CMYK	cmyk(74%, 33.8%, 0%, 14.1%)
CIE-LAB	lab(58.26, -1.46, -45.22)
CIE-LCH	lch(58.26, 45.24, 268.15°)
OKLab	oklab(63.85% -0.0529 -0.1284)
OKLCH	oklch(63.85% 0.139 247.6)
XYZ	xyz(24.5941, 26.2323, 70.7713)
Luminance	0.2624 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3991DB #DB8339

analogous

#39DBD4 #3991DB #3940DB

triadic

#3991DB #DB3991 #91DB39

tetradic

#3991DB #D439DB #DB8339 #40DB39

square

#3991DB #D439DB #DB8339 #40DB39

split-complementary

#3991DB #DB3940 #DBD439

monochromatic

#185182 #2172B6 #3991DB #6DAEE4 #A1CBEE

Accessibility & contrast

On white

3.36

#3991DB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.25

#3991DB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3991DB

6.25:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3991DB	#FFFFFF	#000000	##000000
##3991DB	1.00	3.36	6.25	6.25
#FFFFFF	3.36	1.00	21.00	21.00
#000000	6.25	21.00	1.00	1.00
##000000	6.25	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6F94DE

Deuteranopia (green-blind)

#5885DA

Tritanopia (blue-blind)

#00A3AC

Achromatopsia (no color)

#8C8C8C

Design tokens & code

CSS

--color: #3991db;
/* rgb */ color: rgb(57, 145, 219);
/* oklch */ color: oklch(63.8% 0.139 247.6);

Tailwind

colors: {
  custom: {
    50: '#84b0e6',
    500: '#3991db',
    950: '#000000',
  },
}

SCSS

$custom: #3991db;
$custom-light: #84b0e6;
$custom-dark: #000000;

JSON

{
  "hex": "#3991db",
  "rgb": {
    "r": 57,
    "g": 145,
    "b": 219
  },
  "hsl": {
    "h": 207.407,
    "s": 69.231,
    "l": 54.118
  },
  "oklch": {
    "l": 0.63847,
    "c": 0.1389,
    "h": 247.6
  },
  "luminance": 0.26235
}

Semantic roles & 50–950 ramp

primary

#3991DB

secondary

#DAB595

accent

#8C3CEC

background

#F8FAFE

surface

#F0F4FC

border

#CBCED5

text

#0C1016

muted

#7D7F84

Preview Lab

Preview with #3991DB

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

Preview Lab → · Contrast checker → · Palette generator →