#428BB0#428BB0

#428BB0 is a mid, moderate cyan. Relative luminance 0.228; OKLCH L 60.6% C 0.092 H 233.2°. Best body text is #000000 at 5.55:1 contrast (WCAG AA passes).

Color values

HEX	#428BB0
RGB	rgb(66, 139, 176)
HSL	hsl(200, 45%, 47%)
HSV	hsv(200, 63%, 69%)
CMYK	cmyk(62.5%, 21%, 0%, 31%)
CIE-LAB	lab(54.82, -11.31, -26.25)
CIE-LCH	lch(54.82, 28.58, 246.69°)
OKLab	oklab(60.57% -0.055 -0.0734)
OKLCH	oklch(60.57% 0.092 233.2)
XYZ	xyz(19.3128, 22.7562, 44.4405)
Luminance	0.2276 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BB0 #B06742

analogous

#42B09E #428BB0 #4254B0

triadic

#428BB0 #B0428B #8BB042

tetradic

#428BB0 #9E42B0 #B06742 #54B042

square

#428BB0 #9E42B0 #B06742 #54B042

split-complementary

#428BB0 #B04254 #B09E42

monochromatic

#214557 #316883 #428BB0 #69A7C7 #95C1D7

Accessibility & contrast

On white

3.78

#428BB0 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.55

#428BB0 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BB0

5.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BB0	#FFFFFF	#000000	##000000
##428BB0	1.00	3.78	5.55	5.55
#FFFFFF	3.78	1.00	21.00	21.00
#000000	5.55	21.00	1.00	1.00
##000000	5.55	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#798AB2

Deuteranopia (green-blind)

#6A7EAF

Tritanopia (blue-blind)

#009597

Achromatopsia (no color)

#838383

Design tokens & code

CSS

--color: #428bb0;
/* rgb */ color: rgb(66, 139, 176);
/* oklch */ color: oklch(60.6% 0.092 233.2);

Tailwind

colors: {
  custom: {
    50: '#81acc7',
    500: '#428bb0',
    950: '#000000',
  },
}

SCSS

$custom: #428bb0;
$custom-light: #81acc7;
$custom-dark: #000000;

JSON

{
  "hex": "#428bb0",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 176
  },
  "hsl": {
    "h": 200.182,
    "s": 45.455,
    "l": 47.451
  },
  "oklch": {
    "l": 0.60566,
    "c": 0.09175,
    "h": 233.2
  },
  "luminance": 0.22758
}

Semantic roles & 50–950 ramp

primary

#428BB0

secondary

#C39E8B

accent

#7F53D5

background

#F8FAFC

surface

#EFF4F8

border

#CACED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428BB0

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

Preview Lab → · Contrast checker → · Palette generator →