#428BBB#428BBB

#428BBB is a mid, moderate cyan. Relative luminance 0.232; OKLCH L 61.1% C 0.103 H 240.2°. Best body text is #000000 at 5.64:1 contrast (WCAG AA passes).

Color values

HEX	#428BBB
RGB	rgb(66, 139, 187)
HSL	hsl(204, 48%, 50%)
HSV	hsv(204, 65%, 73%)
CMYK	cmyk(64.7%, 25.7%, 0%, 26.7%)
CIE-LAB	lab(55.29, -7.69, -31.81)
CIE-LCH	lch(55.29, 32.72, 256.42°)
OKLab	oklab(61.09% -0.0511 -0.0894)
OKLCH	oklch(61.09% 0.103 240.2)
XYZ	xyz(20.4456, 23.2093, 50.4064)
Luminance	0.2321 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BBB #BB7242

analogous

#42BBAF #428BBB #424EBB

triadic

#428BBB #BB428B #8BBB42

tetradic

#428BBB #AF42BB #BB7242 #4EBB42

square

#428BBB #AF42BB #BB7242 #4EBB42

split-complementary

#428BBB #BB424E #BBAF42

monochromatic

#224861 #32698E #428BBB #6EA7CC #9CC2DC

Accessibility & contrast

On white

3.72

#428BBB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.64

#428BBB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BBB

5.64:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BBB	#FFFFFF	#000000	##000000
##428BBB	1.00	3.72	5.64	5.64
#FFFFFF	3.72	1.00	21.00	21.00
#000000	5.64	21.00	1.00	1.00
##000000	5.64	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#758BBD

Deuteranopia (green-blind)

#657FBA

Tritanopia (blue-blind)

#00979B

Achromatopsia (no color)

#848484

Design tokens & code

CSS

--color: #428bbb;
/* rgb */ color: rgb(66, 139, 187);
/* oklch */ color: oklch(61.1% 0.103 240.2);

Tailwind

colors: {
  custom: {
    50: '#82accf',
    500: '#428bbb',
    950: '#000000',
  },
}

SCSS

$custom: #428bbb;
$custom-light: #82accf;
$custom-dark: #000000;

JSON

{
  "hex": "#428bbb",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 187
  },
  "hsl": {
    "h": 203.802,
    "s": 47.826,
    "l": 49.608
  },
  "oklch": {
    "l": 0.6109,
    "c": 0.10303,
    "h": 240.2
  },
  "luminance": 0.23211
}

Semantic roles & 50–950 ramp

primary

#428BBB

secondary

#C8A791

accent

#8650D7

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0C1014

muted

#7D7F82

Preview Lab

Preview with #428BBB

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

Preview Lab → · Contrast checker → · Palette generator →