#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
RGB	rgb(99, 111, 203)
HSL	hsl(233, 50%, 59%)
HSV	hsv(233, 51%, 80%)
CMYK	cmyk(51.2%, 45.3%, 0%, 20.4%)
CIE-LAB	lab(49.90, 21.12, -49.34)
CIE-LCH	lch(49.90, 53.66, 293.17°)
OKLab	oklab(57.61% 0.0134 -0.1402)
OKLCH	oklch(57.61% 0.141 275.5)
XYZ	xyz(21.6061, 18.3320, 58.8882)
Luminance	0.1833 (WCAG relative)
Temperature	cool
Family	blue

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
##636FCB	1.00	4.50	4.67	4.67
#FFFFFF	4.50	1.00	21.00	21.00
#000000	4.67	21.00	1.00	1.00
##000000	4.67	21.00	1.00	1.00

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 →