#428BB3#428BB3

#428BB3 is a mid, moderate cyan. Relative luminance 0.229; OKLCH L 60.7% C 0.095 H 235.3°. Best body text is #000000 at 5.58:1 contrast (WCAG AA passes).

Color values

HEX	#428BB3
RGB	rgb(66, 139, 179)
HSL	hsl(201, 46%, 48%)
HSV	hsv(201, 63%, 70%)
CMYK	cmyk(63.1%, 22.3%, 0%, 29.8%)
CIE-LAB	lab(54.94, -10.33, -27.78)
CIE-LCH	lch(54.94, 29.63, 249.60°)
OKLab	oklab(60.71% -0.0539 -0.0778)
OKLCH	oklch(60.71% 0.095 235.3)
XYZ	xyz(19.6129, 22.8762, 46.0210)
Luminance	0.2288 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BB3 #B36A42

analogous

#42B3A2 #428BB3 #4252B3

triadic

#428BB3 #B3428B #8BB342

tetradic

#428BB3 #A242B3 #B36A42 #52B342

square

#428BB3 #A242B3 #B36A42 #52B342

split-complementary

#428BB3 #B34252 #B3A242

monochromatic

#21465A #326886 #428BB3 #6AA7C8 #97C1D9

Accessibility & contrast

On white

3.77

#428BB3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.58

#428BB3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BB3

5.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BB3	#FFFFFF	#000000	##000000
##428BB3	1.00	3.77	5.58	5.58
#FFFFFF	3.77	1.00	21.00	21.00
#000000	5.58	21.00	1.00	1.00
##000000	5.58	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#788AB5

Deuteranopia (green-blind)

#687EB2

Tritanopia (blue-blind)

#009598

Achromatopsia (no color)

#838383

Design tokens & code

CSS

--color: #428bb3;
/* rgb */ color: rgb(66, 139, 179);
/* oklch */ color: oklch(60.7% 0.095 235.3);

Tailwind

colors: {
  custom: {
    50: '#81acca',
    500: '#428bb3',
    950: '#000000',
  },
}

SCSS

$custom: #428bb3;
$custom-light: #81acca;
$custom-dark: #000000;

JSON

{
  "hex": "#428bb3",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 179
  },
  "hsl": {
    "h": 201.239,
    "s": 46.122,
    "l": 48.039
  },
  "oklch": {
    "l": 0.60706,
    "c": 0.09466,
    "h": 235.3
  },
  "luminance": 0.22878
}

Semantic roles & 50–950 ramp

primary

#428BB3

secondary

#C4A08C

accent

#8152D6

background

#F8FAFC

surface

#EFF4F8

border

#CACED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428BB3

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

Preview Lab → · Contrast checker → · Palette generator →