#638CFB#638CFB

#638CFB is a light, vivid blue. Relative luminance 0.284; OKLCH L 66.4% C 0.171 H 266.5°. Best body text is #000000 at 6.67:1 contrast (WCAG AA passes).

Color values

HEX	#638CFB
RGB	rgb(99, 140, 251)
HSL	hsl(224, 95%, 69%)
HSV	hsv(224, 61%, 98%)
CMYK	cmyk(60.6%, 44.2%, 0%, 1.6%)
CIE-LAB	lab(60.22, 19.04, -59.72)
CIE-LCH	lch(60.22, 62.68, 287.68°)
OKLab	oklab(66.38% -0.0103 -0.1704)
OKLCH	oklch(66.38% 0.171 266.5)
XYZ	xyz(31.9303, 28.3711, 95.0416)
Luminance	0.2837 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#638CFB #FBD263

analogous

#63D8FB #638CFB #8663FB

triadic

#638CFB #FB638C #8CFB63

tetradic

#638CFB #FB63D8 #FBD263 #63FB86

square

#638CFB #FB63D8 #FBD263 #63FB86

split-complementary

#638CFB #FB8663 #D8FB63

monochromatic

#0640DE #2760F9 #638CFB #9FB8FD #DAE4FE

Accessibility & contrast

On white

3.15

#638CFB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.67

#638CFB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #638CFB

6.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##638CFB	#FFFFFF	#000000	##000000
##638CFB	1.00	3.15	6.67	6.67
#FFFFFF	3.15	1.00	21.00	21.00
#000000	6.67	21.00	1.00	1.00
##000000	6.67	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5898FF

Deuteranopia (green-blind)

#408BF9

Tritanopia (blue-blind)

#00A5B7

Achromatopsia (no color)

#919191

Design tokens & code

CSS

--color: #638cfb;
/* rgb */ color: rgb(99, 140, 251);
/* oklch */ color: oklch(66.4% 0.171 266.5);

Tailwind

colors: {
  custom: {
    50: '#9cadfd',
    500: '#638cfb',
    950: '#000000',
  },
}

SCSS

$custom: #638cfb;
$custom-light: #9cadfd;
$custom-dark: #000000;

JSON

{
  "hex": "#638cfb",
  "rgb": {
    "r": 99,
    "g": 140,
    "b": 251
  },
  "hsl": {
    "h": 223.816,
    "s": 95,
    "l": 68.627
  },
  "oklch": {
    "l": 0.66377,
    "c": 0.17072,
    "h": 266.5
  },
  "luminance": 0.28374
}

Semantic roles & 50–950 ramp

primary

#638CFB

secondary

#F4E7C6

accent

#A800E6

background

#FAFAFF

surface

#F4F4FF

border

#CECED7

text

#0F1018

muted

#7F7F86

Preview Lab

Preview with #638CFB

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

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