#638CF3#638CF3

#638CF3 is a light, vivid blue. Relative luminance 0.279; OKLCH L 65.9% C 0.160 H 265.8°. Best body text is #000000 at 6.58:1 contrast (WCAG AA passes).

Color values

HEX	#638CF3
RGB	rgb(99, 140, 243)
HSL	hsl(223, 86%, 67%)
HSV	hsv(223, 59%, 95%)
CMYK	cmyk(59.3%, 42.4%, 0%, 4.7%)
CIE-LAB	lab(59.78, 16.42, -56.03)
CIE-LCH	lch(59.78, 58.38, 286.33°)
OKLab	oklab(65.89% -0.0116 -0.1596)
OKLCH	oklch(65.89% 0.16 265.8)
XYZ	xyz(30.6958, 27.8773, 88.5399)
Luminance	0.2788 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#638CF3 #F3CA63

analogous

#63D4F3 #638CF3 #8263F3

triadic

#638CF3 #F3638C #8CF363

tetradic

#638CF3 #F363D4 #F3CA63 #63F382

square

#638CF3 #F363D4 #F3CA63 #63F382

split-complementary

#638CF3 #F38263 #D4F363

monochromatic

#1045CC #2A62EF #638CF3 #9CB6F7 #D5E0FC

Accessibility & contrast

On white

3.19

#638CF3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.58

#638CF3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #638CF3

6.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##638CF3	#FFFFFF	#000000	##000000
##638CF3	1.00	3.19	6.58	6.58
#FFFFFF	3.19	1.00	21.00	21.00
#000000	6.58	21.00	1.00	1.00
##000000	6.58	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5E97F7

Deuteranopia (green-blind)

#498AF1

Tritanopia (blue-blind)

#00A3B4

Achromatopsia (no color)

#909090

Design tokens & code

CSS

--color: #638cf3;
/* rgb */ color: rgb(99, 140, 243);
/* oklch */ color: oklch(65.9% 0.160 265.8);

Tailwind

colors: {
  custom: {
    50: '#9aadf7',
    500: '#638cf3',
    950: '#000000',
  },
}

SCSS

$custom: #638cf3;
$custom-light: #9aadf7;
$custom-dark: #000000;

JSON

{
  "hex": "#638cf3",
  "rgb": {
    "r": 99,
    "g": 140,
    "b": 243
  },
  "hsl": {
    "h": 222.917,
    "s": 85.714,
    "l": 67.059
  },
  "oklch": {
    "l": 0.65892,
    "c": 0.15998,
    "h": 265.8
  },
  "luminance": 0.2788
}

Semantic roles & 50–950 ramp

primary

#638CF3

secondary

#F0E3C2

accent

#A303E2

background

#FAFAFF

surface

#F4F4FF

border

#CECED7

text

#0F1017

muted

#7F7F85

Preview Lab

Preview with #638CF3

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

Preview Lab → · Contrast checker → · Palette generator →