#637FE5#637FE5

#637FE5 is a light, vivid blue. Relative luminance 0.235; OKLCH L 62.4% C 0.157 H 269.9°. Best body text is #000000 at 5.70:1 contrast (WCAG AA passes).

Color values

HEX	#637FE5
RGB	rgb(99, 127, 229)
HSL	hsl(227, 71%, 64%)
HSV	hsv(227, 57%, 90%)
CMYK	cmyk(56.8%, 44.5%, 0%, 10.2%)
CIE-LAB	lab(55.57, 19.68, -54.97)
CIE-LCH	lch(55.57, 58.38, 289.70°)
OKLab	oklab(62.41% -0.0004 -0.1566)
OKLCH	oklch(62.41% 0.157 269.9)
XYZ	xyz(26.8731, 23.4865, 77.2308)
Luminance	0.2349 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637FE5 #E5C963

analogous

#63C0E5 #637FE5 #8863E5

triadic

#637FE5 #E5637F #7FE563

tetradic

#637FE5 #E563C0 #E5C963 #63E588

square

#637FE5 #E563C0 #E5C963 #63E588

split-complementary

#637FE5 #E58863 #C0E563

monochromatic

#1D3DB0 #2F54DC #637FE5 #97AAEE #CCD5F6

Accessibility & contrast

On white

3.69

#637FE5 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.70

#637FE5 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637FE5

5.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637FE5	#FFFFFF	#000000	##000000
##637FE5	1.00	3.69	5.70	5.70
#FFFFFF	3.69	1.00	21.00	21.00
#000000	5.70	21.00	1.00	1.00
##000000	5.70	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#518BE9

Deuteranopia (green-blind)

#3F80E3

Tritanopia (blue-blind)

#0196A7

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #637fe5;
/* rgb */ color: rgb(99, 127, 229);
/* oklch */ color: oklch(62.4% 0.157 269.9);

Tailwind

colors: {
  custom: {
    50: '#99a3ee',
    500: '#637fe5',
    950: '#000000',
  },
}

SCSS

$custom: #637fe5;
$custom-light: #99a3ee;
$custom-dark: #000000;

JSON

{
  "hex": "#637fe5",
  "rgb": {
    "r": 99,
    "g": 127,
    "b": 229
  },
  "hsl": {
    "h": 227.077,
    "s": 71.429,
    "l": 64.314
  },
  "oklch": {
    "l": 0.62414,
    "c": 0.1566,
    "h": 269.9
  },
  "luminance": 0.23489
}

Semantic roles & 50–950 ramp

primary

#637FE5

secondary

#E8DFBB

accent

#AA12D3

background

#F9FAFE

surface

#F2F3FD

border

#CCCDD5

text

#0F0F16

muted

#7E7F84

Preview Lab

Preview with #637FE5

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

Preview Lab → · Contrast checker → · Palette generator →