#637DDF#637DDF

#637DDF is a mid, vivid blue. Relative luminance 0.226; OKLCH L 61.6% C 0.151 H 270.3°. Best body text is #000000 at 5.53:1 contrast (WCAG AA passes).

Color values

HEX	#637DDF
RGB	rgb(99, 125, 223)
HSL	hsl(227, 66%, 63%)
HSV	hsv(227, 56%, 87%)
CMYK	cmyk(55.6%, 43.9%, 0%, 12.5%)
CIE-LAB	lab(54.71, 18.95, -52.99)
CIE-LCH	lch(54.71, 56.27, 289.68°)
OKLab	oklab(61.64% 0.0008 -0.1508)
OKLCH	oklch(61.64% 0.151 270.3)
XYZ	xyz(25.7941, 22.6457, 72.8095)
Luminance	0.2265 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637DDF #DFC563

analogous

#63BBDF #637DDF #8763DF

triadic

#637DDF #DF637D #7DDF63

tetradic

#637DDF #DF63BB #DFC563 #63DF87

square

#637DDF #DF63BB #DFC563 #63DF87

split-complementary

#637DDF #DF8763 #BBDF63

monochromatic

#223EA6 #3053D5 #637DDF #96A7E9 #C9D2F4

Accessibility & contrast

On white

3.80

#637DDF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.53

#637DDF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637DDF

5.53:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637DDF	#FFFFFF	#000000	##000000
##637DDF	1.00	3.80	5.53	5.53
#FFFFFF	3.80	1.00	21.00	21.00
#000000	5.53	21.00	1.00	1.00
##000000	5.53	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5289E3

Deuteranopia (green-blind)

#427EDD

Tritanopia (blue-blind)

#1893A3

Achromatopsia (no color)

#838383

Design tokens & code

CSS

--color: #637ddf;
/* rgb */ color: rgb(99, 125, 223);
/* oklch */ color: oklch(61.6% 0.151 270.3);

Tailwind

colors: {
  custom: {
    50: '#98a2e9',
    500: '#637ddf',
    950: '#000000',
  },
}

SCSS

$custom: #637ddf;
$custom-light: #98a2e9;
$custom-dark: #000000;

JSON

{
  "hex": "#637ddf",
  "rgb": {
    "r": 99,
    "g": 125,
    "b": 223
  },
  "hsl": {
    "h": 227.419,
    "s": 65.957,
    "l": 63.137
  },
  "oklch": {
    "l": 0.61643,
    "c": 0.15081,
    "h": 270.3
  },
  "luminance": 0.22648
}

Semantic roles & 50–950 ramp

primary

#637DDF

secondary

#E5DCB9

accent

#A818CE

background

#F9F9FE

surface

#F2F2FD

border

#CCCCD5

text

#0E0F16

muted

#7E7E84

Preview Lab

Preview with #637DDF

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

Preview Lab → · Contrast checker → · Palette generator →