#63B9EF#63B9EF

#63B9EF is a light, moderate cyan. Relative luminance 0.436; OKLCH L 75.3% C 0.114 H 238.4°. Best body text is #000000 at 9.72:1 contrast (WCAG AA passes).

Color values

HEX#63B9EF
RGBrgb(99, 185, 239)
HSLhsl(203, 81%, 66%)
HSVhsv(203, 59%, 94%)
CMYKcmyk(58.6%, 22.6%, 0%, 6.3%)
CIE-LABlab(71.95, -10.51, -34.70)
CIE-LCHlch(71.95, 36.26, 253.14°)
OKLaboklab(75.34% -0.0598 -0.0972)
OKLCHoklch(75.34% 0.114 238.4)
XYZxyz(38.0687, 43.5790, 88.0500)
Luminance0.4358 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#63B9EF #EF9963
analogous
#63EFDF #63B9EF #6373EF
triadic
#63B9EF #EF63B9 #B9EF63
tetradic
#63B9EF #DF63EF #EF9963 #73EF63
square
#63B9EF #DF63EF #EF9963 #73EF63
split-complementary
#63B9EF #EF6373 #EFDF63
monochromatic
#1480C4 #2BA0E9 #63B9EF #9BD2F5 #D2EBFA

Accessibility & contrast

On white

2.16
#63B9EF on #FFFFFF
AA ✗AA large ✗AAA ✗

On black

9.72
#63B9EF on #000000
AA ✓AA large ✓AAA ✓

Best text color

#000000 on #63B9EF
9.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##63B9EF#FFFFFF#000000##000000
##63B9EF1.002.169.729.72
#FFFFFF2.161.0021.0021.00
#0000009.7221.001.001.00
##0000009.7221.001.001.00

Color blindness preview

Protanopia (red-blind)
#A0B8F2
Deuteranopia (green-blind)
#8DAAEE
Tritanopia (blue-blind)
#00C7CB
Achromatopsia (no color)
#B0B0B0

Design tokens & code

CSS
--color: #63b9ef;
/* rgb */ color: rgb(99, 185, 239);
/* oklch */ color: oklch(75.3% 0.114 238.4);
Tailwind
colors: {
  custom: {
    50: '#9acef4',
    500: '#63b9ef',
    950: '#000000',
  },
}
SCSS
$custom: #63b9ef;
$custom-light: #9acef4;
$custom-dark: #000000;
JSON
{
  "hex": "#63b9ef",
  "rgb": {
    "r": 99,
    "g": 185,
    "b": 239
  },
  "hsl": {
    "h": 203.143,
    "s": 81.395,
    "l": 66.275
  },
  "oklch": {
    "l": 0.75344,
    "c": 0.11411,
    "h": 238.4
  },
  "luminance": 0.43583
}

Semantic roles & 50–950 ramp

primary
#63B9EF
secondary
#EED2C0
accent
#5A08DE
background
#FAFCFE
surface
#F3F9FD
border
#CDD2D5
text
#0F1317
muted
#7F8285

Preview Lab

Preview with #63B9EF

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

Preview Lab → · Contrast checker → · Palette generator →

#63B9EF Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva