#428FDC#428FDC

#428FDC is a light, vivid cyan. Relative luminance 0.260; OKLCH L 63.7% C 0.139 H 250.9°. Best body text is #000000 at 6.19:1 contrast (WCAG AA passes).

Color values

HEX#428FDC
RGBrgb(66, 143, 220)
HSLhsl(210, 69%, 56%)
HSVhsv(210, 70%, 86%)
CMYKcmyk(70%, 35%, 0%, 13.7%)
CIE-LABlab(58.01, 1.29, -46.15)
CIE-LCHlch(58.01, 46.17, 271.60°)
OKLaboklab(63.74% -0.0454 -0.1311)
OKLCHoklch(63.74% 0.139 250.9)
XYZxyz(24.9827, 25.9678, 71.3919)
Luminance0.2597 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#428FDC #DC8F42
analogous
#42DCDC #428FDC #4242DC
triadic
#428FDC #DC428F #8FDC42
tetradic
#428FDC #DC42DC #DC8F42 #42DC42
square
#428FDC #DC42DC #DC8F42 #42DC42
split-complementary
#428FDC #DC4242 #DCDC42
monochromatic
#1A528A #2370BE #428FDC #76AEE6 #A9CCEF

Accessibility & contrast

On white

3.39
#428FDC on #FFFFFF
AA ✗AA large ✓AAA ✗

On black

6.19
#428FDC on #000000
AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FDC
6.19:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##428FDC#FFFFFF#000000##000000
##428FDC1.003.396.196.19
#FFFFFF3.391.0021.0021.00
#0000006.1921.001.001.00
##0000006.1921.001.001.00

Color blindness preview

Protanopia (red-blind)
#6C93DF
Deuteranopia (green-blind)
#5685DA
Tritanopia (blue-blind)
#00A1AB
Achromatopsia (no color)
#8B8B8B

Design tokens & code

CSS
--color: #428fdc;
/* rgb */ color: rgb(66, 143, 220);
/* oklch */ color: oklch(63.7% 0.139 250.9);
Tailwind
colors: {
  custom: {
    50: '#88afe7',
    500: '#428fdc',
    950: '#000000',
  },
}
SCSS
$custom: #428fdc;
$custom-light: #88afe7;
$custom-dark: #000000;
JSON
{
  "hex": "#428fdc",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 220
  },
  "hsl": {
    "h": 210,
    "s": 68.75,
    "l": 56.078
  },
  "oklch": {
    "l": 0.63744,
    "c": 0.13873,
    "h": 250.9
  },
  "luminance": 0.2597
}

Semantic roles & 50–950 ramp

primary
#428FDC
secondary
#DDBD9D
accent
#943CEC
background
#F9FAFE
surface
#F1F4FC
border
#CBCED5
text
#0D1016
muted
#7E7F84

Preview Lab

Preview with #428FDC

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

Preview Lab → · Contrast checker → · Palette generator →

#428FDC Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva