#637CFA#637CFA

#637CFA is a light, vivid blue. Relative luminance 0.240; OKLCH L 63.2% C 0.189 H 271.6°. Best body text is #000000 at 5.79:1 contrast (WCAG AA passes).

Color values

HEX	#637CFA
RGB	rgb(99, 124, 250)
HSL	hsl(230, 94%, 68%)
HSV	hsv(230, 60%, 98%)
CMYK	cmyk(60.4%, 50.4%, 0%, 2%)
CIE-LAB	lab(56.06, 28.34, -65.86)
CIE-LCH	lch(56.06, 71.70, 293.28°)
OKLab	oklab(63.19% 0.0051 -0.1887)
OKLCH	oklch(63.19% 0.189 271.6)
XYZ	xyz(29.6028, 23.9676, 93.4902)
Luminance	0.2397 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637CFA #FAE163

analogous

#63C7FA #637CFA #9563FA

triadic

#637CFA #FA637C #7CFA63

tetradic

#637CFA #FA63C7 #FAE163 #63FA95

square

#637CFA #FA63C7 #FAE163 #63FA95

split-complementary

#637CFA #FA9563 #C7FA63

monochromatic

#072ADC #284AF8 #637CFA #9EAEFC #DAE0FE

Accessibility & contrast

On white

3.62

#637CFA on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.79

#637CFA on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637CFA

5.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637CFA	#FFFFFF	#000000	##000000
##637CFA	1.00	3.62	5.79	5.79
#FFFFFF	3.62	1.00	21.00	21.00
#000000	5.79	21.00	1.00	1.00
##000000	5.79	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#358DFE

Deuteranopia (green-blind)

#0580F7

Tritanopia (blue-blind)

#0099AF

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #637cfa;
/* rgb */ color: rgb(99, 124, 250);
/* oklch */ color: oklch(63.2% 0.189 271.6);

Tailwind

colors: {
  custom: {
    50: '#9ca1fd',
    500: '#637cfa',
    950: '#000000',
  },
}

SCSS

$custom: #637cfa;
$custom-light: #9ca1fd;
$custom-dark: #000000;

JSON

{
  "hex": "#637cfa",
  "rgb": {
    "r": 99,
    "g": 124,
    "b": 250
  },
  "hsl": {
    "h": 230.066,
    "s": 93.789,
    "l": 68.431
  },
  "oklch": {
    "l": 0.63186,
    "c": 0.18873,
    "h": 271.6
  },
  "luminance": 0.2397
}

Semantic roles & 50–950 ramp

primary

#637CFA

secondary

#F3ECC6

accent

#C000E6

background

#FAF9FF

surface

#F4F2FF

border

#CECCD7

text

#0F0F18

muted

#7F7E86

Preview Lab

Preview with #637CFA

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

Preview Lab → · Contrast checker → · Palette generator →