#637BDD#637BDD

#637BDD is a mid, vivid blue. Relative luminance 0.220; OKLCH L 61.1% C 0.151 H 271.0°. Best body text is #000000 at 5.41:1 contrast (WCAG AA passes).

Color values

HEX	#637BDD
RGB	rgb(99, 123, 221)
HSL	hsl(228, 64%, 63%)
HSV	hsv(228, 55%, 87%)
CMYK	cmyk(55.2%, 44.3%, 0%, 13.3%)
CIE-LAB	lab(54.07, 19.52, -52.88)
CIE-LCH	lch(54.07, 56.37, 290.26°)
OKLab	oklab(61.12% 0.0027 -0.1505)
OKLCH	oklch(61.12% 0.151 271)
XYZ	xyz(25.2754, 22.0372, 71.3143)
Luminance	0.2204 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637BDD #DDC563

analogous

#63B8DD #637BDD #8863DD

triadic

#637BDD #DD637B #7BDD63

tetradic

#637BDD #DD63B8 #DDC563 #63DD88

square

#637BDD #DD63B8 #DDC563 #63DD88

split-complementary

#637BDD #DD8863 #B8DD63

monochromatic

#233CA2 #3150D2 #637BDD #95A6E8 #C7D0F3

Accessibility & contrast

On white

3.88

#637BDD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.41

#637BDD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637BDD

5.41:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637BDD	#FFFFFF	#000000	##000000
##637BDD	1.00	3.88	5.41	5.41
#FFFFFF	3.88	1.00	21.00	21.00
#000000	5.41	21.00	1.00	1.00
##000000	5.41	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5087E1

Deuteranopia (green-blind)

#407CDB

Tritanopia (blue-blind)

#1D91A1

Achromatopsia (no color)

#818181

Design tokens & code

CSS

--color: #637bdd;
/* rgb */ color: rgb(99, 123, 221);
/* oklch */ color: oklch(61.1% 0.151 271.0);

Tailwind

colors: {
  custom: {
    50: '#98a0e8',
    500: '#637bdd',
    950: '#000000',
  },
}

SCSS

$custom: #637bdd;
$custom-light: #98a0e8;
$custom-dark: #000000;

JSON

{
  "hex": "#637bdd",
  "rgb": {
    "r": 99,
    "g": 123,
    "b": 221
  },
  "hsl": {
    "h": 228.197,
    "s": 64.211,
    "l": 62.745
  },
  "oklch": {
    "l": 0.61118,
    "c": 0.15054,
    "h": 271
  },
  "luminance": 0.22039
}

Semantic roles & 50–950 ramp

primary

#637BDD

secondary

#E4DBB8

accent

#A919CC

background

#F9F9FE

surface

#F2F2FD

border

#CCCCD5

text

#0E0E16

muted

#7E7E84

Preview Lab

Preview with #637BDD

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

Preview Lab → · Contrast checker → · Palette generator →