#428FB5#428FB5

#428FB5 is a mid, moderate cyan. Relative luminance 0.241; OKLCH L 61.8% C 0.095 H 232.7°. Best body text is #000000 at 5.83:1 contrast (WCAG AA passes).

Color values

HEX	#428FB5
RGB	rgb(66, 143, 181)
HSL	hsl(200, 47%, 48%)
HSV	hsv(200, 64%, 71%)
CMYK	cmyk(63.5%, 21%, 0%, 29%)
CIE-LAB	lab(56.23, -11.92, -26.94)
CIE-LCH	lch(56.23, 29.45, 246.13°)
OKLab	oklab(61.75% -0.0575 -0.0754)
OKLCH	oklch(61.75% 0.095 232.7)
XYZ	xyz(20.4065, 24.1373, 47.2906)
Luminance	0.2414 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428FB5 #B56842

analogous

#42B5A1 #428FB5 #4255B5

triadic

#428FB5 #B5428F #8FB542

tetradic

#428FB5 #A142B5 #B56842 #55B542

square

#428FB5 #A142B5 #B56842 #55B542

split-complementary

#428FB5 #B54255 #B5A142

monochromatic

#21485B #326C88 #428FB5 #6BAAC9 #98C4D9

Accessibility & contrast

On white

3.60

#428FB5 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.83

#428FB5 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428FB5

5.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428FB5	#FFFFFF	#000000	##000000
##428FB5	1.00	3.60	5.83	5.83
#FFFFFF	3.60	1.00	21.00	21.00
#000000	5.83	21.00	1.00	1.00
##000000	5.83	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7C8DB7

Deuteranopia (green-blind)

#6C82B4

Tritanopia (blue-blind)

#00999C

Achromatopsia (no color)

#878787

Design tokens & code

CSS

--color: #428fb5;
/* rgb */ color: rgb(66, 143, 181);
/* oklch */ color: oklch(61.8% 0.095 232.7);

Tailwind

colors: {
  custom: {
    50: '#82afcb',
    500: '#428fb5',
    950: '#000000',
  },
}

SCSS

$custom: #428fb5;
$custom-light: #82afcb;
$custom-dark: #000000;

JSON

{
  "hex": "#428fb5",
  "rgb": {
    "r": 66,
    "g": 143,
    "b": 181
  },
  "hsl": {
    "h": 199.826,
    "s": 46.559,
    "l": 48.431
  },
  "oklch": {
    "l": 0.61751,
    "c": 0.09482,
    "h": 232.7
  },
  "luminance": 0.24139
}

Semantic roles & 50–950 ramp

primary

#428FB5

secondary

#C5A08E

accent

#7D52D6

background

#F8FAFC

surface

#F0F4F8

border

#CBCED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428FB5

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

Preview Lab → · Contrast checker → · Palette generator →