#637BF4#637BF4

#637BF4 is a light, vivid blue. Relative luminance 0.234; OKLCH L 62.6% C 0.182 H 271.7°. Best body text is #000000 at 5.67:1 contrast (WCAG AA passes).

Color values

HEX	#637BF4
RGB	rgb(99, 123, 244)
HSL	hsl(230, 87%, 67%)
HSV	hsv(230, 59%, 96%)
CMYK	cmyk(59.4%, 49.6%, 0%, 4.3%)
CIE-LAB	lab(55.43, 26.98, -63.55)
CIE-LCH	lch(55.43, 69.04, 293.01°)
OKLab	oklab(62.59% 0.0055 -0.1819)
OKLCH	oklch(62.59% 0.182 271.7)
XYZ	xyz(28.5523, 23.3479, 88.5724)
Luminance	0.2335 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637BF4 #F4DC63

analogous

#63C3F4 #637BF4 #9463F4

triadic

#637BF4 #F4637B #7BF463

tetradic

#637BF4 #F463C3 #F4DC63 #63F494

square

#637BF4 #F463C3 #F4DC63 #63F494

split-complementary

#637BF4 #F49463 #C3F463

monochromatic

#0F2ECE #2A4BF0 #637BF4 #9CABF8 #D5DCFC

Accessibility & contrast

On white

3.70

#637BF4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.67

#637BF4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637BF4

5.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637BF4	#FFFFFF	#000000	##000000
##637BF4	1.00	3.70	5.67	5.67
#FFFFFF	3.70	1.00	21.00	21.00
#000000	5.67	21.00	1.00	1.00
##000000	5.67	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#3A8BF8

Deuteranopia (green-blind)

#1A7FF1

Tritanopia (blue-blind)

#0097AC

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #637bf4;
/* rgb */ color: rgb(99, 123, 244);
/* oklch */ color: oklch(62.6% 0.182 271.7);

Tailwind

colors: {
  custom: {
    50: '#9ba0f8',
    500: '#637bf4',
    950: '#000000',
  },
}

SCSS

$custom: #637bf4;
$custom-light: #9ba0f8;
$custom-dark: #000000;

JSON

{
  "hex": "#637bf4",
  "rgb": {
    "r": 99,
    "g": 123,
    "b": 244
  },
  "hsl": {
    "h": 230.069,
    "s": 86.826,
    "l": 67.255
  },
  "oklch": {
    "l": 0.62593,
    "c": 0.18194,
    "h": 271.7
  },
  "luminance": 0.2335
}

Semantic roles & 50–950 ramp

primary

#637BF4

secondary

#F0E9C3

accent

#BE02E3

background

#FAF9FF

surface

#F4F2FF

border

#CECCD7

text

#0F0E17

muted

#7F7E85

Preview Lab

Preview with #637BF4

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

Preview Lab → · Contrast checker → · Palette generator →