#637FF4#637FF4

#637FF4 is a light, vivid blue. Relative luminance 0.244; OKLCH L 63.4% C 0.177 H 270.5°. Best body text is #000000 at 5.87:1 contrast (WCAG AA passes).

Color values

HEX	#637FF4
RGB	rgb(99, 127, 244)
HSL	hsl(228, 87%, 67%)
HSV	hsv(228, 59%, 96%)
CMYK	cmyk(59.4%, 48%, 0%, 4.3%)
CIE-LAB	lab(56.45, 24.56, -61.91)
CIE-LCH	lch(56.45, 66.60, 291.64°)
OKLab	oklab(63.37% 0.0016 -0.177)
OKLCH	oklch(63.37% 0.177 270.5)
XYZ	xyz(29.0586, 24.3607, 88.7412)
Luminance	0.2436 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637FF4 #F4D863

analogous

#63C7F4 #637FF4 #9063F4

triadic

#637FF4 #F4637F #7FF463

tetradic

#637FF4 #F463C7 #F4D863 #63F490

square

#637FF4 #F463C7 #F4D863 #63F490

split-complementary

#637FF4 #F49063 #C7F463

monochromatic

#0F34CE #2A50F0 #637FF4 #9CAEF8 #D5DDFC

Accessibility & contrast

On white

3.58

#637FF4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.87

#637FF4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637FF4

5.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637FF4	#FFFFFF	#000000	##000000
##637FF4	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)

#448EF8

Deuteranopia (green-blind)

#2981F2

Tritanopia (blue-blind)

#009AAE

Achromatopsia (no color)

#878787

Design tokens & code

CSS

--color: #637ff4;
/* rgb */ color: rgb(99, 127, 244);
/* oklch */ color: oklch(63.4% 0.177 270.5);

Tailwind

colors: {
  custom: {
    50: '#9ba3f8',
    500: '#637ff4',
    950: '#000000',
  },
}

SCSS

$custom: #637ff4;
$custom-light: #9ba3f8;
$custom-dark: #000000;

JSON

{
  "hex": "#637ff4",
  "rgb": {
    "r": 99,
    "g": 127,
    "b": 244
  },
  "hsl": {
    "h": 228.414,
    "s": 86.826,
    "l": 67.255
  },
  "oklch": {
    "l": 0.63365,
    "c": 0.17701,
    "h": 270.5
  },
  "luminance": 0.24363
}

Semantic roles & 50–950 ramp

primary

#637FF4

secondary

#F0E7C3

accent

#B802E3

background

#FAFAFF

surface

#F4F3FF

border

#CECDD7

text

#0F0F17

muted

#7F7F85

Preview Lab

Preview with #637FF4

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

Preview Lab → · Contrast checker → · Palette generator →