#428FA5#428FA5

#428FA5 is a mid, moderate cyan. Relative luminance 0.235; OKLCH L 61.0% C 0.082 H 219.3°. Best body text is #000000 at 5.70:1 contrast (WCAG AA passes).

Color values

HEX	#428FA5
RGB	rgb(66, 143, 165)
HSL	hsl(193, 43%, 45%)
HSV	hsv(193, 60%, 65%)
CMYK	cmyk(60%, 13.3%, 0%, 35.3%)
CIE-LAB	lab(55.60, -17.00, -18.75)
CIE-LCH	lch(55.60, 25.31, 227.79°)
OKLab	oklab(61.05% -0.0636 -0.0521)
OKLCH	oklch(61.05% 0.082 219.3)
XYZ	xyz(18.8581, 23.5179, 39.1356)
Luminance	0.2352 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FA5 #A55842

analogous

#42A589 #428FA5 #425EA5

triadic

#428FA5 #A5428F #8FA542

tetradic

#428FA5 #8942A5 #A55842 #5EA542

square

#428FA5 #8942A5 #A55842 #5EA542

split-complementary

#428FA5 #A5425E #A58942

monochromatic

#1F434E #316979 #428FA5 #63ACC1 #8FC3D2

Accessibility & contrast

On white

3.68

#428FA5 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.70

#428FA5 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FA5

5.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FA5	#FFFFFF	#000000	##000000
##428FA5	1.00	3.68	5.70	5.70
#FFFFFF	3.68	1.00	21.00	21.00
#000000	5.70	21.00	1.00	1.00
##000000	5.70	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#818BA6

Deuteranopia (green-blind)

#7381A5

Tritanopia (blue-blind)

#009696

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #428fa5;
/* rgb */ color: rgb(66, 143, 165);
/* oklch */ color: oklch(61.0% 0.082 219.3);

Tailwind

colors: {
  custom: {
    50: '#80b0bf',
    500: '#428fa5',
    950: '#000000',
  },
}

SCSS

$custom: #428fa5;
$custom-light: #80b0bf;
$custom-dark: #000000;

JSON

{
  "hex": "#428fa5",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 165
  },
  "hsl": {
    "h": 193.333,
    "s": 42.857,
    "l": 45.294
  },
  "oklch": {
    "l": 0.61048,
    "c": 0.08223,
    "h": 219.3
  },
  "luminance": 0.2352
}

Semantic roles & 50–950 ramp

primary

#428FA5

secondary

#BD9285

accent

#7155D3

background

#F8FAFB

surface

#EFF4F7

border

#CACED0

text

#0B1012

muted

#7C7F81

Preview Lab

Preview with #428FA5

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

Preview Lab → · Contrast checker → · Palette generator →