#638AFB#638AFB

#638AFB is a light, vivid blue. Relative luminance 0.278; OKLCH L 66.0% C 0.173 H 267.2°. Best body text is #000000 at 6.56:1 contrast (WCAG AA passes).

Color values

HEX	#638AFB
RGB	rgb(99, 138, 251)
HSL	hsl(225, 95%, 69%)
HSV	hsv(225, 61%, 98%)
CMYK	cmyk(60.6%, 45%, 0%, 1.6%)
CIE-LAB	lab(59.70, 20.23, -60.56)
CIE-LCH	lch(59.70, 63.85, 288.48°)
OKLab	oklab(65.98% -0.0083 -0.1729)
OKLCH	oklch(65.98% 0.173 267.2)
XYZ	xyz(31.6407, 27.7919, 94.9451)
Luminance	0.2779 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#638AFB #FBD463

analogous

#63D6FB #638AFB #8863FB

triadic

#638AFB #FB638A #8AFB63

tetradic

#638AFB #FB63D6 #FBD463 #63FB88

square

#638AFB #FB63D6 #FBD463 #63FB88

split-complementary

#638AFB #FB8863 #D6FB63

monochromatic

#063DDE #275DF9 #638AFB #9FB7FD #DAE4FE

Accessibility & contrast

On white

3.20

#638AFB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.56

#638AFB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #638AFB

6.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##638AFB	#FFFFFF	#000000	##000000
##638AFB	1.00	3.20	6.56	6.56
#FFFFFF	3.20	1.00	21.00	21.00
#000000	6.56	21.00	1.00	1.00
##000000	6.56	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5497FF

Deuteranopia (green-blind)

#3C89F9

Tritanopia (blue-blind)

#00A4B6

Achromatopsia (no color)

#909090

Design tokens & code

CSS

--color: #638afb;
/* rgb */ color: rgb(99, 138, 251);
/* oklch */ color: oklch(66.0% 0.173 267.2);

Tailwind

colors: {
  custom: {
    50: '#9cabfd',
    500: '#638afb',
    950: '#000000',
  },
}

SCSS

$custom: #638afb;
$custom-light: #9cabfd;
$custom-dark: #000000;

JSON

{
  "hex": "#638afb",
  "rgb": {
    "r": 99,
    "g": 138,
    "b": 251
  },
  "hsl": {
    "h": 224.605,
    "s": 95,
    "l": 68.627
  },
  "oklch": {
    "l": 0.65977,
    "c": 0.17309,
    "h": 267.2
  },
  "luminance": 0.27795
}

Semantic roles & 50–950 ramp

primary

#638AFB

secondary

#F4E8C6

accent

#AB00E6

background

#FAFAFF

surface

#F4F4FF

border

#CECED7

text

#0F1018

muted

#7F7F86

Preview Lab

Preview with #638AFB

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

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