#428CB8#428CB8

#428CB8 is a mid, moderate cyan. Relative luminance 0.234; OKLCH L 61.2% C 0.099 H 237.6°. Best body text is #000000 at 5.68:1 contrast (WCAG AA passes).

Color values

HEX	#428CB8
RGB	rgb(66, 140, 184)
HSL	hsl(202, 47%, 49%)
HSV	hsv(202, 64%, 72%)
CMYK	cmyk(64.1%, 23.9%, 0%, 27.8%)
CIE-LAB	lab(55.45, -9.25, -29.84)
CIE-LCH	lch(55.45, 31.24, 252.78°)
OKLab	oklab(61.18% -0.0532 -0.0837)
OKLCH	oklch(61.18% 0.099 237.6)
XYZ	xyz(20.2733, 23.3731, 48.7811)
Luminance	0.2338 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428CB8 #B86E42

analogous

#42B8A9 #428CB8 #4251B8

triadic

#428CB8 #B8428C #8CB842

tetradic

#428CB8 #A942B8 #B86E42 #51B842

square

#428CB8 #A942B8 #B86E42 #51B842

split-complementary

#428CB8 #B84251 #B8A942

monochromatic

#22475E #326A8B #428CB8 #6DA8CB #9AC2DB

Accessibility & contrast

On white

3.70

#428CB8 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.68

#428CB8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428CB8

5.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428CB8	#FFFFFF	#000000	##000000
##428CB8	1.00	3.70	5.68	5.68
#FFFFFF	3.70	1.00	21.00	21.00
#000000	5.68	21.00	1.00	1.00
##000000	5.68	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#778BBA

Deuteranopia (green-blind)

#6780B7

Tritanopia (blue-blind)

#00979B

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #428cb8;
/* rgb */ color: rgb(66, 140, 184);
/* oklch */ color: oklch(61.2% 0.099 237.6);

Tailwind

colors: {
  custom: {
    50: '#82adcd',
    500: '#428cb8',
    950: '#000000',
  },
}

SCSS

$custom: #428cb8;
$custom-light: #82adcd;
$custom-dark: #000000;

JSON

{
  "hex": "#428cb8",
  "rgb": {
    "r": 66,
    "g": 140,
    "b": 184
  },
  "hsl": {
    "h": 202.373,
    "s": 47.2,
    "l": 49.02
  },
  "oklch": {
    "l": 0.6118,
    "c": 0.09923,
    "h": 237.6
  },
  "luminance": 0.23375
}

Semantic roles & 50–950 ramp

primary

#428CB8

secondary

#C7A48F

accent

#8351D7

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428CB8

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

Preview Lab → · Contrast checker → · Palette generator →