#637EF8#637EF8

#637EF8 is a light, vivid blue. Relative luminance 0.244; OKLCH L 63.4% C 0.184 H 270.9°. Best body text is #000000 at 5.87:1 contrast (WCAG AA passes).

Color values

HEX	#637EF8
RGB	rgb(99, 126, 248)
HSL	hsl(229, 91%, 68%)
HSV	hsv(229, 60%, 97%)
CMYK	cmyk(60.1%, 49.2%, 0%, 2.7%)
CIE-LAB	lab(56.44, 26.48, -64.14)
CIE-LCH	lch(56.44, 69.39, 292.43°)
OKLab	oklab(63.43% 0.003 -0.1836)
OKLCH	oklch(63.43% 0.184 270.9)
XYZ	xyz(29.5441, 24.3492, 91.9317)
Luminance	0.2435 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637EF8 #F8DD63

analogous

#63C8F8 #637EF8 #9363F8

triadic

#637EF8 #F8637E #7EF863

tetradic

#637EF8 #F863C8 #F8DD63 #63F893

square

#637EF8 #F863C8 #F8DD63 #63F893

split-complementary

#637EF8 #F89363 #C8F863

monochromatic

#0A2FD7 #284EF5 #637EF8 #9EAEFB #D8DFFD

Accessibility & contrast

On white

3.58

#637EF8 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.87

#637EF8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637EF8

5.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637EF8	#FFFFFF	#000000	##000000
##637EF8	1.00	3.58	5.87	5.87
#FFFFFF	3.58	1.00	21.00	21.00
#000000	5.87	21.00	1.00	1.00
##000000	5.87	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#3D8EFC

Deuteranopia (green-blind)

#1C81F5

Tritanopia (blue-blind)

#009AAF

Achromatopsia (no color)

#878787

Design tokens & code

CSS

--color: #637ef8;
/* rgb */ color: rgb(99, 126, 248);
/* oklch */ color: oklch(63.4% 0.184 270.9);

Tailwind

colors: {
  custom: {
    50: '#9ca3fb',
    500: '#637ef8',
    950: '#000000',
  },
}

SCSS

$custom: #637ef8;
$custom-light: #9ca3fb;
$custom-dark: #000000;

JSON

{
  "hex": "#637ef8",
  "rgb": {
    "r": 99,
    "g": 126,
    "b": 248
  },
  "hsl": {
    "h": 229.128,
    "s": 91.411,
    "l": 68.039
  },
  "oklch": {
    "l": 0.63434,
    "c": 0.1836,
    "h": 270.9
  },
  "luminance": 0.24352
}

Semantic roles & 50–950 ramp

primary

#637EF8

secondary

#F2EAC5

accent

#BC00E6

background

#FAF9FF

surface

#F4F2FF

border

#CECCD7

text

#0F0F17

muted

#7F7E85

Preview Lab

Preview with #637EF8

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

Preview Lab → · Contrast checker → · Palette generator →