#428CB9#428CB9

#428CB9 is a mid, moderate cyan. Relative luminance 0.234; OKLCH L 61.2% C 0.100 H 238.2°. Best body text is #000000 at 5.68:1 contrast (WCAG AA passes).

Color values

HEX	#428CB9
RGB	rgb(66, 140, 185)
HSL	hsl(203, 47%, 49%)
HSV	hsv(203, 64%, 73%)
CMYK	cmyk(64.3%, 24.3%, 0%, 27.5%)
CIE-LAB	lab(55.50, -8.92, -30.34)
CIE-LCH	lch(55.50, 31.63, 253.62°)
OKLab	oklab(61.23% -0.0529 -0.0852)
OKLCH	oklch(61.23% 0.1 238.2)
XYZ	xyz(20.3785, 23.4151, 49.3351)
Luminance	0.2342 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428CB9 #B96F42

analogous

#42B9AB #428CB9 #4251B9

triadic

#428CB9 #B9428C #8CB942

tetradic

#428CB9 #AB42B9 #B96F42 #51B942

square

#428CB9 #AB42B9 #B96F42 #51B942

split-complementary

#428CB9 #B94251 #B9AB42

monochromatic

#22485F #326A8C #428CB9 #6DA8CB #9AC3DB

Accessibility & contrast

On white

3.69

#428CB9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.68

#428CB9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428CB9

5.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428CB9	#FFFFFF	#000000	##000000
##428CB9	1.00	3.69	5.68	5.68
#FFFFFF	3.69	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)

#778CBB

Deuteranopia (green-blind)

#6780B8

Tritanopia (blue-blind)

#00979B

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #428cb9;
/* rgb */ color: rgb(66, 140, 185);
/* oklch */ color: oklch(61.2% 0.100 238.2);

Tailwind

colors: {
  custom: {
    50: '#82adce',
    500: '#428cb9',
    950: '#000000',
  },
}

SCSS

$custom: #428cb9;
$custom-light: #82adce;
$custom-dark: #000000;

JSON

{
  "hex": "#428cb9",
  "rgb": {
    "r": 66,
    "g": 140,
    "b": 185
  },
  "hsl": {
    "h": 202.689,
    "s": 47.41,
    "l": 49.216
  },
  "oklch": {
    "l": 0.61228,
    "c": 0.10028,
    "h": 238.2
  },
  "luminance": 0.23417
}

Semantic roles & 50–950 ramp

primary

#428CB9

secondary

#C7A590

accent

#8451D7

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428CB9

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

Preview Lab → · Contrast checker → · Palette generator →