#428BC3#428BC3

#428BC3 is a mid, moderate cyan. Relative luminance 0.236; OKLCH L 61.5% C 0.112 H 244.3°. Best body text is #000000 at 5.71:1 contrast (WCAG AA passes).

Color values

HEX	#428BC3
RGB	rgb(66, 139, 195)
HSL	hsl(206, 52%, 51%)
HSV	hsv(206, 66%, 76%)
CMYK	cmyk(66.2%, 28.7%, 0%, 23.5%)
CIE-LAB	lab(55.65, -4.99, -35.80)
CIE-LCH	lch(55.65, 36.14, 262.06°)
OKLab	oklab(61.49% -0.0486 -0.101)
OKLCH	oklch(61.49% 0.112 244.3)
XYZ	xyz(21.3260, 23.5614, 55.0431)
Luminance	0.2356 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BC3 #C37A42

analogous

#42C3BB #428BC3 #424AC3

triadic

#428BC3 #C3428B #8BC342

tetradic

#428BC3 #BB42C3 #C37A42 #4AC342

square

#428BC3 #BB42C3 #C37A42 #4AC342

split-complementary

#428BC3 #C3424A #C3BB42

monochromatic

#214A69 #306B98 #428BC3 #70A8D2 #9FC4E0

Accessibility & contrast

On white

3.68

#428BC3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.71

#428BC3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BC3

5.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BC3	#FFFFFF	#000000	##000000
##428BC3	1.00	3.68	5.71	5.71
#FFFFFF	3.68	1.00	21.00	21.00
#000000	5.71	21.00	1.00	1.00
##000000	5.71	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#728CC5

Deuteranopia (green-blind)

#6080C2

Tritanopia (blue-blind)

#00999F

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #428bc3;
/* rgb */ color: rgb(66, 139, 195);
/* oklch */ color: oklch(61.5% 0.112 244.3);

Tailwind

colors: {
  custom: {
    50: '#84acd5',
    500: '#428bc3',
    950: '#000000',
  },
}

SCSS

$custom: #428bc3;
$custom-light: #84acd5;
$custom-dark: #000000;

JSON

{
  "hex": "#428bc3",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 195
  },
  "hsl": {
    "h": 206.047,
    "s": 51.807,
    "l": 51.176
  },
  "oklch": {
    "l": 0.61492,
    "c": 0.11205,
    "h": 244.3
  },
  "luminance": 0.23564
}

Semantic roles & 50–950 ramp

primary

#428BC3

secondary

#CDAD94

accent

#8A4DDB

background

#F8FAFD

surface

#F0F4FA

border

#CBCED3

text

#0C1014

muted

#7D7F83

Preview Lab

Preview with #428BC3

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

Preview Lab → · Contrast checker → · Palette generator →