#637DDF#637DDF

#637DDF is a mid, vivid blue. Relative luminance 0.226; OKLCH L 61.6% C 0.151 H 270.3°. Best body text is #000000 at 5.53:1 contrast (WCAG AA passes).

Color values

HEX#637DDF
RGBrgb(99, 125, 223)
HSLhsl(227, 66%, 63%)
HSVhsv(227, 56%, 87%)
CMYKcmyk(55.6%, 43.9%, 0%, 12.5%)
CIE-LABlab(54.71, 18.95, -52.99)
CIE-LCHlch(54.71, 56.27, 289.68°)
OKLaboklab(61.64% 0.0008 -0.1508)
OKLCHoklch(61.64% 0.151 270.3)
XYZxyz(25.7941, 22.6457, 72.8095)
Luminance0.2265 (WCAG relative)
Temperaturecool
Familyblue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#637DDF #DFC563
analogous
#63BBDF #637DDF #8763DF
triadic
#637DDF #DF637D #7DDF63
tetradic
#637DDF #DF63BB #DFC563 #63DF87
square
#637DDF #DF63BB #DFC563 #63DF87
split-complementary
#637DDF #DF8763 #BBDF63
monochromatic
#223EA6 #3053D5 #637DDF #96A7E9 #C9D2F4

Accessibility & contrast

On white

3.80
#637DDF on #FFFFFF
AA ✗AA large ✓AAA ✗

On black

5.53
#637DDF on #000000
AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637DDF
5.53:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##637DDF#FFFFFF#000000##000000
##637DDF1.003.805.535.53
#FFFFFF3.801.0021.0021.00
#0000005.5321.001.001.00
##0000005.5321.001.001.00

Color blindness preview

Protanopia (red-blind)
#5289E3
Deuteranopia (green-blind)
#427EDD
Tritanopia (blue-blind)
#1893A3
Achromatopsia (no color)
#838383

Design tokens & code

CSS
--color: #637ddf;
/* rgb */ color: rgb(99, 125, 223);
/* oklch */ color: oklch(61.6% 0.151 270.3);
Tailwind
colors: {
  custom: {
    50: '#98a2e9',
    500: '#637ddf',
    950: '#000000',
  },
}
SCSS
$custom: #637ddf;
$custom-light: #98a2e9;
$custom-dark: #000000;
JSON
{
  "hex": "#637ddf",
  "rgb": {
    "r": 99,
    "g": 125,
    "b": 223
  },
  "hsl": {
    "h": 227.419,
    "s": 65.957,
    "l": 63.137
  },
  "oklch": {
    "l": 0.61643,
    "c": 0.15081,
    "h": 270.3
  },
  "luminance": 0.22648
}

Semantic roles & 50–950 ramp

primary
#637DDF
secondary
#E5DCB9
accent
#A818CE
background
#F9F9FE
surface
#F2F2FD
border
#CCCCD5
text
#0E0F16
muted
#7E7E84

Preview Lab

Preview with #637DDF

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

Preview Lab → · Contrast checker → · Palette generator →

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