#636FCB#636FCB

#636FCB is a mid, vivid blue. Relative luminance 0.183; OKLCH L 57.6% C 0.141 H 275.5°. Best body text is #000000 at 4.67:1 contrast (WCAG AA passes).

Color values

HEX#636FCB
RGBrgb(99, 111, 203)
HSLhsl(233, 50%, 59%)
HSVhsv(233, 51%, 80%)
CMYKcmyk(51.2%, 45.3%, 0%, 20.4%)
CIE-LABlab(49.90, 21.12, -49.34)
CIE-LCHlch(49.90, 53.66, 293.17°)
OKLaboklab(57.61% 0.0134 -0.1402)
OKLCHoklch(57.61% 0.141 275.5)
XYZxyz(21.6061, 18.3320, 58.8882)
Luminance0.1833 (WCAG relative)
Temperaturecool
Familyblue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#636FCB #CBBF63
analogous
#63A3CB #636FCB #8B63CB
triadic
#636FCB #CB636F #6FCB63
tetradic
#636FCB #CB63A3 #CBBF63 #63CB8B
square
#636FCB #CB63A3 #CBBF63 #63CB8B
split-complementary
#636FCB #CB8B63 #A3CB63
monochromatic
#2D3787 #3C4AB5 #636FCB #9199DA #BFC4EA

Accessibility & contrast

On white

4.50
#636FCB on #FFFFFF
AA ✓AA large ✓AAA ✗

On black

4.67
#636FCB on #000000
AA ✓AA large ✓AAA ✗

Best text color

#000000 on #636FCB
4.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##636FCB#FFFFFF#000000##000000
##636FCB1.004.504.674.67
#FFFFFF4.501.0021.0021.00
#0000004.6721.001.001.00
##0000004.6721.001.001.00

Color blindness preview

Protanopia (red-blind)
#487BCE
Deuteranopia (green-blind)
#3D73C9
Tritanopia (blue-blind)
#378393
Achromatopsia (no color)
#777777

Design tokens & code

CSS
--color: #636fcb;
/* rgb */ color: rgb(99, 111, 203);
/* oklch */ color: oklch(57.6% 0.141 275.5);
Tailwind
colors: {
  custom: {
    50: '#9698db',
    500: '#636fcb',
    950: '#000000',
  },
}
SCSS
$custom: #636fcb;
$custom-light: #9698db;
$custom-dark: #000000;
JSON
{
  "hex": "#636fcb",
  "rgb": {
    "r": 99,
    "g": 111,
    "b": 203
  },
  "hsl": {
    "h": 233.077,
    "s": 50,
    "l": 59.216
  },
  "oklch": {
    "l": 0.57608,
    "c": 0.14086,
    "h": 275.5
  },
  "luminance": 0.18333
}

Semantic roles & 50–950 ramp

primary
#636FCB
secondary
#D9D5B1
accent
#C94EDA
background
#F9F9FD
surface
#F2F2FB
border
#CCCCD4
text
#0E0D15
muted
#7E7E83

Preview Lab

Preview with #636FCB

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

Preview Lab → · Contrast checker → · Palette generator →

#636FCB Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva