#637BCD#637BCD

#637BCD is a mid, vivid blue. Relative luminance 0.212; OKLCH L 60.2% C 0.128 H 269.9°. Best body text is #000000 at 5.25:1 contrast (WCAG AA passes).

Color values

HEX	#637BCD
RGB	rgb(99, 123, 205)
HSL	hsl(226, 51%, 60%)
HSV	hsv(226, 52%, 80%)
CMYK	cmyk(51.7%, 40%, 0%, 19.6%)
CIE-LAB	lab(53.19, 14.42, -45.23)
CIE-LCH	lch(53.19, 47.47, 287.69°)
OKLab	oklab(60.17% -0.0002 -0.1281)
OKLCH	oklch(60.17% 0.128 269.9)
XYZ	xyz(23.2444, 21.2248, 60.6177)
Luminance	0.2123 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637BCD #CDB563

analogous

#63B0CD #637BCD #8063CD

triadic

#637BCD #CD637B #7BCD63

tetradic

#637BCD #CD63B0 #CDB563 #63CD80

square

#637BCD #CD63B0 #CDB563 #63CD80

split-complementary

#637BCD #CD8063 #B0CD63

monochromatic

#2C418A #3B57B8 #637BCD #91A2DC #C0C9EB

Accessibility & contrast

On white

4.00

#637BCD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.25

#637BCD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637BCD

5.25:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637BCD	#FFFFFF	#000000	##000000
##637BCD	1.00	4.00	5.25	5.25
#FFFFFF	4.00	1.00	21.00	21.00
#000000	5.25	21.00	1.00	1.00
##000000	5.25	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5A84D0

Deuteranopia (green-blind)

#4E7BCB

Tritanopia (blue-blind)

#328D9A

Achromatopsia (no color)

#7F7F7F

Design tokens & code

CSS

--color: #637bcd;
/* rgb */ color: rgb(99, 123, 205);
/* oklch */ color: oklch(60.2% 0.128 269.9);

Tailwind

colors: {
  custom: {
    50: '#96a0dc',
    500: '#637bcd',
    950: '#000000',
  },
}

SCSS

$custom: #637bcd;
$custom-light: #96a0dc;
$custom-dark: #000000;

JSON

{
  "hex": "#637bcd",
  "rgb": {
    "r": 99,
    "g": 123,
    "b": 205
  },
  "hsl": {
    "h": 226.415,
    "s": 51.456,
    "l": 59.608
  },
  "oklch": {
    "l": 0.60167,
    "c": 0.12809,
    "h": 269.9
  },
  "luminance": 0.21226
}

Semantic roles & 50–950 ramp

primary

#637BCD

secondary

#DAD1B1

accent

#BB4DDB

background

#F9F9FD

surface

#F2F2FB

border

#CCCCD4

text

#0E0E15

muted

#7E7E83

Preview Lab

Preview with #637BCD

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

Preview Lab → · Contrast checker → · Palette generator →