#637EF0#637EF0

#637EF0 is a light, vivid blue. Relative luminance 0.239; OKLCH L 62.9% C 0.173 H 270.7°. Best body text is #000000 at 5.77:1 contrast (WCAG AA passes).

Color values

HEX	#637EF0
RGB	rgb(99, 126, 240)
HSL	hsl(229, 82%, 66%)
HSV	hsv(229, 59%, 94%)
CMYK	cmyk(58.8%, 47.5%, 0%, 5.9%)
CIE-LAB	lab(55.95, 23.86, -60.49)
CIE-LCH	lch(55.95, 65.02, 291.53°)
OKLab	oklab(62.91% 0.0021 -0.1728)
OKLCH	oklch(62.91% 0.173 270.7)
XYZ	xyz(28.3294, 23.8634, 85.5344)
Luminance	0.2387 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637EF0 #F0D563

analogous

#63C4F0 #637EF0 #8F63F0

triadic

#637EF0 #F0637E #7EF063

tetradic

#637EF0 #F063C4 #F0D563 #63F08F

square

#637EF0 #F063C4 #F0D563 #63F08F

split-complementary

#637EF0 #F08F63 #C4F063

monochromatic

#1335C6 #2B50EB #637EF0 #9BACF5 #D3DAFB

Accessibility & contrast

On white

3.64

#637EF0 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.77

#637EF0 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637EF0

5.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637EF0	#FFFFFF	#000000	##000000
##637EF0	1.00	3.64	5.77	5.77
#FFFFFF	3.64	1.00	21.00	21.00
#000000	5.77	21.00	1.00	1.00
##000000	5.77	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#458DF4

Deuteranopia (green-blind)

#2D80EE

Tritanopia (blue-blind)

#0098AB

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #637ef0;
/* rgb */ color: rgb(99, 126, 240);
/* oklch */ color: oklch(62.9% 0.173 270.7);

Tailwind

colors: {
  custom: {
    50: '#9aa3f6',
    500: '#637ef0',
    950: '#000000',
  },
}

SCSS

$custom: #637ef0;
$custom-light: #9aa3f6;
$custom-dark: #000000;

JSON

{
  "hex": "#637ef0",
  "rgb": {
    "r": 99,
    "g": 126,
    "b": 240
  },
  "hsl": {
    "h": 228.511,
    "s": 82.456,
    "l": 66.471
  },
  "oklch": {
    "l": 0.6291,
    "c": 0.17284,
    "h": 270.7
  },
  "luminance": 0.23866
}

Semantic roles & 50–950 ramp

primary

#637EF0

secondary

#EEE6C1

accent

#B507DF

background

#FAF9FF

surface

#F4F2FE

border

#CECCD6

text

#0F0F17

muted

#7F7E85

Preview Lab

Preview with #637EF0

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

Preview Lab → · Contrast checker → · Palette generator →