#63B5FB#63B5FB

#63B5FB is a light, vivid cyan. Relative luminance 0.427; OKLCH L 75.0% C 0.130 H 246.4°. Best body text is #000000 at 9.53:1 contrast (WCAG AA passes).

Color values

HEX#63B5FB
RGBrgb(99, 181, 251)
HSLhsl(208, 95%, 69%)
HSVhsv(208, 61%, 98%)
CMYKcmyk(60.6%, 27.9%, 0%, 1.6%)
CIE-LABlab(71.32, -4.61, -42.16)
CIE-LCHlch(71.32, 42.41, 263.75°)
OKLaboklab(75.02% -0.0519 -0.1187)
OKLCHoklch(75.02% 0.13 246.4)
XYZxyz(39.0756, 42.6617, 97.4234)
Luminance0.4266 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#63B5FB #FBA963
analogous
#63FBF5 #63B5FB #6369FB
triadic
#63B5FB #FB63B5 #B5FB63
tetradic
#63B5FB #F563FB #FBA963 #69FB63
square
#63B5FB #F563FB #FBA963 #69FB63
split-complementary
#63B5FB #FB6369 #FBF563
monochromatic
#067ADE #2799F9 #63B5FB #9FD1FD #DAEEFE

Accessibility & contrast

On white

2.20
#63B5FB on #FFFFFF
AA ✗AA large ✗AAA ✗

On black

9.53
#63B5FB on #000000
AA ✓AA large ✓AAA ✓

Best text color

#000000 on #63B5FB
9.53:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##63B5FB#FFFFFF#000000##000000
##63B5FB1.002.209.539.53
#FFFFFF2.201.0021.0021.00
#0000009.5321.001.001.00
##0000009.5321.001.001.00

Color blindness preview

Protanopia (red-blind)
#97B7FE
Deuteranopia (green-blind)
#82A8FA
Tritanopia (blue-blind)
#00C6CD
Achromatopsia (no color)
#AFAFAF

Design tokens & code

CSS
--color: #63b5fb;
/* rgb */ color: rgb(99, 181, 251);
/* oklch */ color: oklch(75.0% 0.130 246.4);
Tailwind
colors: {
  custom: {
    50: '#9bcbfd',
    500: '#63b5fb',
    950: '#000000',
  },
}
SCSS
$custom: #63b5fb;
$custom-light: #9bcbfd;
$custom-dark: #000000;
JSON
{
  "hex": "#63b5fb",
  "rgb": {
    "r": 99,
    "g": 181,
    "b": 251
  },
  "hsl": {
    "h": 207.632,
    "s": 95,
    "l": 68.627
  },
  "oklch": {
    "l": 0.75016,
    "c": 0.12956,
    "h": 246.4
  },
  "luminance": 0.42665
}

Semantic roles & 50–950 ramp

primary
#63B5FB
secondary
#F4DBC6
accent
#6A00E6
background
#FAFCFF
surface
#F4F8FF
border
#CED1D7
text
#0F1317
muted
#7F8285

Preview Lab

Preview with #63B5FB

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

Preview Lab → · Contrast checker → · Palette generator →

#63B5FB Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva