#637CCC#637CCC

#637CCC is a mid, vivid blue. Relative luminance 0.214; OKLCH L 60.3% C 0.125 H 269.3°. Best body text is #000000 at 5.29:1 contrast (WCAG AA passes).

Color values

HEX	#637CCC
RGB	rgb(99, 124, 204)
HSL	hsl(226, 51%, 59%)
HSV	hsv(226, 51%, 80%)
CMYK	cmyk(51.5%, 39.2%, 0%, 20%)
CIE-LAB	lab(53.41, 13.51, -44.31)
CIE-LCH	lch(53.41, 46.33, 286.95°)
OKLab	oklab(60.32% -0.0015 -0.1254)
OKLCH	oklch(60.32% 0.125 269.3)
XYZ	xyz(23.2488, 21.4260, 60.0256)
Luminance	0.2143 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637CCC #CCB363

analogous

#63B1CC #637CCC #7F63CC

triadic

#637CCC #CC637C #7CCC63

tetradic

#637CCC #CC63B1 #CCB363 #63CC7F

square

#637CCC #CC63B1 #CCB363 #63CC7F

split-complementary

#637CCC #CC7F63 #B1CC63

monochromatic

#2C4288 #3C59B6 #637CCC #91A3DB #BFC9EA

Accessibility & contrast

On white

3.97

#637CCC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.29

#637CCC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637CCC

5.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637CCC	#FFFFFF	#000000	##000000
##637CCC	1.00	3.97	5.29	5.29
#FFFFFF	3.97	1.00	21.00	21.00
#000000	5.29	21.00	1.00	1.00
##000000	5.29	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5C85CF

Deuteranopia (green-blind)

#517BCA

Tritanopia (blue-blind)

#338D9A

Achromatopsia (no color)

#808080

Design tokens & code

CSS

--color: #637ccc;
/* rgb */ color: rgb(99, 124, 204);
/* oklch */ color: oklch(60.3% 0.125 269.3);

Tailwind

colors: {
  custom: {
    50: '#96a1dc',
    500: '#637ccc',
    950: '#000000',
  },
}

SCSS

$custom: #637ccc;
$custom-light: #96a1dc;
$custom-dark: #000000;

JSON

{
  "hex": "#637ccc",
  "rgb": {
    "r": 99,
    "g": 124,
    "b": 204
  },
  "hsl": {
    "h": 225.714,
    "s": 50.725,
    "l": 59.412
  },
  "oklch": {
    "l": 0.60317,
    "c": 0.12542,
    "h": 269.3
  },
  "luminance": 0.21428
}

Semantic roles & 50–950 ramp

primary

#637CCC

secondary

#DAD0B1

accent

#B94EDA

background

#F9F9FD

surface

#F2F2FB

border

#CCCCD4

text

#0E0E15

muted

#7E7E83

Preview Lab

Preview with #637CCC

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

Preview Lab → · Contrast checker → · Palette generator →