#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
RGBrgb(57, 145, 219)
HSLhsl(207, 69%, 54%)
HSVhsv(207, 74%, 86%)
CMYKcmyk(74%, 33.8%, 0%, 14.1%)
CIE-LABlab(58.26, -1.46, -45.22)
CIE-LCHlch(58.26, 45.24, 268.15°)
OKLaboklab(63.85% -0.0529 -0.1284)
OKLCHoklch(63.85% 0.139 247.6)
XYZxyz(24.5941, 26.2323, 70.7713)
Luminance0.2624 (WCAG relative)
Temperaturecool
Familycyan

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
##3991DB1.003.366.256.25
#FFFFFF3.361.0021.0021.00
#0000006.2521.001.001.00
##0000006.2521.001.001.00

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 →

#3991DB Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva