#637AAA#637AAA

#637AAA is a mid, moderate blue. Relative luminance 0.195; OKLCH L 58.1% C 0.079 H 264.4°. Best body text is #000000 at 4.89:1 contrast (WCAG AA passes).

Color values

HEX	#637AAA
RGB	rgb(99, 122, 170)
HSL	hsl(221, 29%, 53%)
HSV	hsv(221, 42%, 67%)
CMYK	cmyk(41.8%, 28.2%, 0%, 33.3%)
CIE-LAB	lab(51.24, 4.37, -28.22)
CIE-LCH	lch(51.24, 28.55, 278.80°)
OKLab	oklab(58.1% -0.0077 -0.0787)
OKLCH	oklch(58.1% 0.079 264.4)
XYZ	xyz(19.3585, 19.4730, 40.7610)
Luminance	0.1947 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637AAA #AA9363

analogous

#639EAA #637AAA #6F63AA

triadic

#637AAA #AA637A #7AAA63

tetradic

#637AAA #AA639E #AA9363 #63AA6F

square

#637AAA #AA639E #AA9363 #63AA6F

split-complementary

#637AAA #AA6F63 #9EAA63

monochromatic

#34425F #495D87 #637AAA #8B9CC0 #B2BED5

Accessibility & contrast

On white

4.29

#637AAA on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.89

#637AAA on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637AAA

4.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637AAA	#FFFFFF	#000000	##000000
##637AAA	1.00	4.29	4.89	4.89
#FFFFFF	4.29	1.00	21.00	21.00
#000000	4.89	21.00	1.00	1.00
##000000	4.89	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#697EAC

Deuteranopia (green-blind)

#6277A9

Tritanopia (blue-blind)

#4B848B

Achromatopsia (no color)

#7A7A7A

Design tokens & code

CSS

--color: #637aaa;
/* rgb */ color: rgb(99, 122, 170);
/* oklch */ color: oklch(58.1% 0.079 264.4);

Tailwind

colors: {
  custom: {
    50: '#92a0c3',
    500: '#637aaa',
    950: '#000000',
  },
}

SCSS

$custom: #637aaa;
$custom-light: #92a0c3;
$custom-dark: #000000;

JSON

{
  "hex": "#637aaa",
  "rgb": {
    "r": 99,
    "g": 122,
    "b": 170
  },
  "hsl": {
    "h": 220.563,
    "s": 29.461,
    "l": 52.745
  },
  "oklch": {
    "l": 0.58099,
    "c": 0.07909,
    "h": 264.4
  },
  "luminance": 0.19474
}

Semantic roles & 50–950 ramp

primary

#637AAA

secondary

#C4BAA5

accent

#A562C6

background

#F9F9FC

surface

#F1F2F8

border

#CBCCD1

text

#0D0E12

muted

#7E7E81

Preview Lab

Preview with #637AAA

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

Preview Lab → · Contrast checker → · Palette generator →