#428BDD#428BDD

#428BDD is a light, vivid cyan. Relative luminance 0.248; OKLCH L 62.9% C 0.144 H 253.3°. Best body text is #000000 at 5.97:1 contrast (WCAG AA passes).

Color values

HEX	#428BDD
RGB	rgb(66, 139, 221)
HSL	hsl(212, 70%, 56%)
HSV	hsv(212, 70%, 87%)
CMYK	cmyk(70.1%, 37.1%, 0%, 13.3%)
CIE-LAB	lab(56.92, 4.01, -48.43)
CIE-LCH	lch(56.92, 48.60, 274.73°)
OKLab	oklab(62.91% -0.0413 -0.1378)
OKLCH	oklch(62.91% 0.144 253.3)
XYZ	xyz(24.5257, 24.8413, 71.8949)
Luminance	0.2484 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BDD #DD9442

analogous

#42D9DD #428BDD #4742DD

triadic

#428BDD #DD428B #8BDD42

tetradic

#428BDD #DD42D9 #DD9442 #42DD47

square

#428BDD #DD42D9 #DD9442 #42DD47

split-complementary

#428BDD #DD4742 #D9DD42

monochromatic

#194F8C #226CBF #428BDD #76ABE6 #AACBF0

Accessibility & contrast

On white

3.52

#428BDD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.97

#428BDD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BDD

5.97:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BDD	#FFFFFF	#000000	##000000
##428BDD	1.00	3.52	5.97	5.97
#FFFFFF	3.52	1.00	21.00	21.00
#000000	5.97	21.00	1.00	1.00
##000000	5.97	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6690E0

Deuteranopia (green-blind)

#4F82DB

Tritanopia (blue-blind)

#009EA9

Achromatopsia (no color)

#898989

Design tokens & code

CSS

--color: #428bdd;
/* rgb */ color: rgb(66, 139, 221);
/* oklch */ color: oklch(62.9% 0.144 253.3);

Tailwind

colors: {
  custom: {
    50: '#88ace8',
    500: '#428bdd',
    950: '#000000',
  },
}

SCSS

$custom: #428bdd;
$custom-light: #88ace8;
$custom-dark: #000000;

JSON

{
  "hex": "#428bdd",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 221
  },
  "hsl": {
    "h": 211.742,
    "s": 69.507,
    "l": 56.275
  },
  "oklch": {
    "l": 0.6291,
    "c": 0.14391,
    "h": 253.3
  },
  "luminance": 0.24844
}

Semantic roles & 50–950 ramp

primary

#428BDD

secondary

#DDBF9D

accent

#993BEC

background

#F9FAFE

surface

#F1F4FC

border

#CBCED5

text

#0D1016

muted

#7E7F84

Preview Lab

Preview with #428BDD

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

Preview Lab → · Contrast checker → · Palette generator →