#428FDB#428FDB

#428FDB is a light, vivid cyan. Relative luminance 0.259; OKLCH L 63.7% C 0.138 H 250.6°. Best body text is #000000 at 6.18:1 contrast (WCAG AA passes).

Color values

HEX	#428FDB
RGB	rgb(66, 143, 219)
HSL	hsl(210, 68%, 56%)
HSV	hsv(210, 70%, 86%)
CMYK	cmyk(69.9%, 34.7%, 0%, 14.1%)
CIE-LAB	lab(57.96, 0.94, -45.67)
CIE-LCH	lch(57.96, 45.68, 271.18°)
OKLab	oklab(63.69% -0.0456 -0.1297)
OKLCH	oklch(63.69% 0.138 250.6)
XYZ	xyz(24.8506, 25.9150, 70.6965)
Luminance	0.2592 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FDB #DB8E42

analogous

#42DBDA #428FDB #4242DB

triadic

#428FDB #DB428F #8FDB42

tetradic

#428FDB #DA42DB #DB8E42 #42DB42

square

#428FDB #DA42DB #DB8E42 #42DB42

split-complementary

#428FDB #DB4242 #DBDA42

monochromatic

#1A5289 #2470BC #428FDB #75ADE5 #A9CCEF

Accessibility & contrast

On white

3.40

#428FDB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.18

#428FDB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FDB

6.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FDB	#FFFFFF	#000000	##000000
##428FDB	1.00	3.40	6.18	6.18
#FFFFFF	3.40	1.00	21.00	21.00
#000000	6.18	21.00	1.00	1.00
##000000	6.18	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6D93DE

Deuteranopia (green-blind)

#5785DA

Tritanopia (blue-blind)

#00A1AB

Achromatopsia (no color)

#8B8B8B

Design tokens & code

CSS

--color: #428fdb;
/* rgb */ color: rgb(66, 143, 219);
/* oklch */ color: oklch(63.7% 0.138 250.6);

Tailwind

colors: {
  custom: {
    50: '#87afe6',
    500: '#428fdb',
    950: '#000000',
  },
}

SCSS

$custom: #428fdb;
$custom-light: #87afe6;
$custom-dark: #000000;

JSON

{
  "hex": "#428fdb",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 219
  },
  "hsl": {
    "h": 209.804,
    "s": 68,
    "l": 55.882
  },
  "oklch": {
    "l": 0.63688,
    "c": 0.1375,
    "h": 250.6
  },
  "luminance": 0.25918
}

Semantic roles & 50–950 ramp

primary

#428FDB

secondary

#DCBC9D

accent

#933DEB

background

#F9FAFE

surface

#F1F4FC

border

#CBCED5

text

#0D1016

muted

#7E7F84

Preview Lab

Preview with #428FDB

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

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