#637CF3#637CF3

#637CF3 is a light, vivid blue. Relative luminance 0.235; OKLCH L 62.7% C 0.179 H 271.4°. Best body text is #000000 at 5.71:1 contrast (WCAG AA passes).

Color values

HEX	#637CF3
RGB	rgb(99, 124, 243)
HSL	hsl(230, 86%, 67%)
HSV	hsv(230, 59%, 95%)
CMYK	cmyk(59.3%, 49%, 0%, 4.7%)
CIE-LAB	lab(55.62, 26.05, -62.68)
CIE-LCH	lch(55.62, 67.88, 292.57°)
OKLab	oklab(62.72% 0.0045 -0.1793)
OKLCH	oklch(62.72% 0.179 271.4)
XYZ	xyz(28.5255, 23.5367, 87.8165)
Luminance	0.2354 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637CF3 #F3DA63

analogous

#63C4F3 #637CF3 #9263F3

triadic

#637CF3 #F3637C #7CF363

tetradic

#637CF3 #F363C4 #F3DA63 #63F392

square

#637CF3 #F363C4 #F3DA63 #63F392

split-complementary

#637CF3 #F39263 #C4F363

monochromatic

#1030CC #2A4CEF #637CF3 #9CACF7 #D5DBFC

Accessibility & contrast

On white

3.68

#637CF3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.71

#637CF3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637CF3

5.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637CF3	#FFFFFF	#000000	##000000
##637CF3	1.00	3.68	5.71	5.71
#FFFFFF	3.68	1.00	21.00	21.00
#000000	5.71	21.00	1.00	1.00
##000000	5.71	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#3E8CF7

Deuteranopia (green-blind)

#217FF1

Tritanopia (blue-blind)

#0097AC

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #637cf3;
/* rgb */ color: rgb(99, 124, 243);
/* oklch */ color: oklch(62.7% 0.179 271.4);

Tailwind

colors: {
  custom: {
    50: '#9ba1f8',
    500: '#637cf3',
    950: '#000000',
  },
}

SCSS

$custom: #637cf3;
$custom-light: #9ba1f8;
$custom-dark: #000000;

JSON

{
  "hex": "#637cf3",
  "rgb": {
    "r": 99,
    "g": 124,
    "b": 243
  },
  "hsl": {
    "h": 229.583,
    "s": 85.714,
    "l": 67.059
  },
  "oklch": {
    "l": 0.62719,
    "c": 0.17937,
    "h": 271.4
  },
  "luminance": 0.23539
}

Semantic roles & 50–950 ramp

primary

#637CF3

secondary

#F0E8C2

accent

#BC03E2

background

#FAF9FF

surface

#F4F2FF

border

#CECCD7

text

#0F0E17

muted

#7F7E85

Preview Lab

Preview with #637CF3

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

Preview Lab → · Contrast checker → · Palette generator →