#637DB8#637DB8

#637DB8 is a mid, moderate blue. Relative luminance 0.208; OKLCH L 59.5% C 0.096 H 265.5°. Best body text is #000000 at 5.16:1 contrast (WCAG AA passes).

Color values

HEX	#637DB8
RGB	rgb(99, 125, 184)
HSL	hsl(222, 37%, 55%)
HSV	hsv(222, 46%, 72%)
CMYK	cmyk(46.2%, 32.1%, 0%, 27.8%)
CIE-LAB	lab(52.71, 6.73, -34.00)
CIE-LCH	lch(52.71, 34.66, 281.20°)
OKLab	oklab(59.45% -0.0076 -0.0954)
OKLCH	oklch(59.45% 0.096 265.5)
XYZ	xyz(21.1282, 20.7793, 48.2356)
Luminance	0.2078 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637DB8 #B89E63

analogous

#63A7B8 #637DB8 #7363B8

triadic

#637DB8 #B8637D #7DB863

tetradic

#637DB8 #B863A7 #B89E63 #63B873

square

#637DB8 #B863A7 #B89E63 #63B873

split-complementary

#637DB8 #B87363 #A7B863

monochromatic

#32456E #455F98 #637DB8 #8DA0CB #B7C3DE

Accessibility & contrast

On white

4.07

#637DB8 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.16

#637DB8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637DB8

5.16:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637DB8	#FFFFFF	#000000	##000000
##637DB8	1.00	4.07	5.16	5.16
#FFFFFF	4.07	1.00	21.00	21.00
#000000	5.16	21.00	1.00	1.00
##000000	5.16	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6782BA

Deuteranopia (green-blind)

#5E7AB7

Tritanopia (blue-blind)

#428992

Achromatopsia (no color)

#7E7E7E

Design tokens & code

CSS

--color: #637db8;
/* rgb */ color: rgb(99, 125, 184);
/* oklch */ color: oklch(59.5% 0.096 265.5);

Tailwind

colors: {
  custom: {
    50: '#93a2cd',
    500: '#637db8',
    950: '#000000',
  },
}

SCSS

$custom: #637db8;
$custom-light: #93a2cd;
$custom-dark: #000000;

JSON

{
  "hex": "#637db8",
  "rgb": {
    "r": 99,
    "g": 125,
    "b": 184
  },
  "hsl": {
    "h": 221.647,
    "s": 37.445,
    "l": 55.49
  },
  "oklch": {
    "l": 0.59451,
    "c": 0.0957,
    "h": 265.5
  },
  "luminance": 0.20781
}

Semantic roles & 50–950 ramp

primary

#637DB8

secondary

#CDC2AA

accent

#AA5ACD

background

#F9F9FC

surface

#F2F2F9

border

#CCCCD2

text

#0D0F13

muted

#7E7E82

Preview Lab

Preview with #637DB8

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

Preview Lab → · Contrast checker → · Palette generator →