#428BD1#428BD1

#428BD1 is a light, vivid cyan. Relative luminance 0.242; OKLCH L 62.2% C 0.129 H 249.8°. Best body text is #000000 at 5.85:1 contrast (WCAG AA passes).

Color values

HEX	#428BD1
RGB	rgb(66, 139, 209)
HSL	hsl(209, 61%, 54%)
HSV	hsv(209, 68%, 82%)
CMYK	cmyk(68.4%, 33.5%, 0%, 18%)
CIE-LAB	lab(56.31, -0.18, -42.66)
CIE-LCH	lch(56.31, 42.66, 269.75°)
OKLab	oklab(62.24% -0.0445 -0.121)
OKLCH	oklch(62.24% 0.129 249.8)
XYZ	xyz(22.9837, 24.2245, 63.7738)
Luminance	0.2423 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BD1 #D18842

analogous

#42D1D0 #428BD1 #4244D1

triadic

#428BD1 #D1428B #8BD142

tetradic

#428BD1 #D042D1 #D18842 #44D142

square

#428BD1 #D042D1 #D18842 #44D142

split-complementary

#428BD1 #D14244 #D1D042

monochromatic

#1E4D7B #2A6CAC #428BD1 #73A9DD #A4C7E9

Accessibility & contrast

On white

3.59

#428BD1 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.85

#428BD1 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BD1

5.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BD1	#FFFFFF	#000000	##000000
##428BD1	1.00	3.59	5.85	5.85
#FFFFFF	3.59	1.00	21.00	21.00
#000000	5.85	21.00	1.00	1.00
##000000	5.85	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6C8ED4

Deuteranopia (green-blind)

#5881D0

Tritanopia (blue-blind)

#009CA4

Achromatopsia (no color)

#878787

Design tokens & code

CSS

--color: #428bd1;
/* rgb */ color: rgb(66, 139, 209);
/* oklch */ color: oklch(62.2% 0.129 249.8);

Tailwind

colors: {
  custom: {
    50: '#86acdf',
    500: '#428bd1',
    950: '#000000',
  },
}

SCSS

$custom: #428bd1;
$custom-light: #86acdf;
$custom-dark: #000000;

JSON

{
  "hex": "#428bd1",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 209
  },
  "hsl": {
    "h": 209.371,
    "s": 60.851,
    "l": 53.922
  },
  "oklch": {
    "l": 0.62235,
    "c": 0.12887,
    "h": 249.8
  },
  "luminance": 0.24227
}

Semantic roles & 50–950 ramp

primary

#428BD1

secondary

#D6B799

accent

#9244E4

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #428BD1

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

Preview Lab → · Contrast checker → · Palette generator →