#637BF7#637BF7

#637BF7 is a light, vivid blue. Relative luminance 0.235; OKLCH L 62.8% C 0.186 H 271.8°. Best body text is #000000 at 5.71:1 contrast (WCAG AA passes).

Color values

HEX#637BF7
RGBrgb(99, 123, 247)
HSLhsl(230, 90%, 68%)
HSVhsv(230, 60%, 97%)
CMYKcmyk(59.9%, 50.2%, 0%, 3.1%)
CIE-LABlab(55.62, 27.96, -64.91)
CIE-LCHlch(55.62, 70.68, 293.31°)
OKLaboklab(62.79% 0.0058 -0.1859)
OKLCHoklch(62.79% 0.186 271.8)
XYZxyz(29.0115, 23.5316, 90.9909)
Luminance0.2353 (WCAG relative)
Temperaturecool
Familyblue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#637BF7 #F7DF63
analogous
#63C5F7 #637BF7 #9563F7
triadic
#637BF7 #F7637B #7BF763
tetradic
#637BF7 #F763C5 #F7DF63 #63F795
square
#637BF7 #F763C5 #F7DF63 #63F795
split-complementary
#637BF7 #F79563 #C5F763
monochromatic
#0B2CD5 #294AF4 #637BF7 #9DACFA #D7DEFD

Accessibility & contrast

On white

3.68
#637BF7 on #FFFFFF
AA ✗AA large ✓AAA ✗

On black

5.71
#637BF7 on #000000
AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637BF7
5.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##637BF7#FFFFFF#000000##000000
##637BF71.003.685.715.71
#FFFFFF3.681.0021.0021.00
#0000005.7121.001.001.00
##0000005.7121.001.001.00

Color blindness preview

Protanopia (red-blind)
#368CFB
Deuteranopia (green-blind)
#0E7FF4
Tritanopia (blue-blind)
#0098AD
Achromatopsia (no color)
#858585

Design tokens & code

CSS
--color: #637bf7;
/* rgb */ color: rgb(99, 123, 247);
/* oklch */ color: oklch(62.8% 0.186 271.8);
Tailwind
colors: {
  custom: {
    50: '#9ca0fb',
    500: '#637bf7',
    950: '#000000',
  },
}
SCSS
$custom: #637bf7;
$custom-light: #9ca0fb;
$custom-dark: #000000;
JSON
{
  "hex": "#637bf7",
  "rgb": {
    "r": 99,
    "g": 123,
    "b": 247
  },
  "hsl": {
    "h": 230.27,
    "s": 90.244,
    "l": 67.843
  },
  "oklch": {
    "l": 0.62794,
    "c": 0.18596,
    "h": 271.8
  },
  "luminance": 0.23534
}

Semantic roles & 50–950 ramp

primary
#637BF7
secondary
#F2EAC4
accent
#C000E6
background
#FAF9FF
surface
#F4F2FF
border
#CECCD7
text
#0F0E17
muted
#7F7E85

Preview Lab

Preview with #637BF7

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

Preview Lab → · Contrast checker → · Palette generator →

#637BF7 Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva