#428CBF#428CBF

#428CBF is a mid, moderate cyan. Relative luminance 0.237; OKLCH L 61.5% C 0.107 H 241.5°. Best body text is #000000 at 5.74:1 contrast (WCAG AA passes).

Color values

HEX	#428CBF
RGB	rgb(66, 140, 191)
HSL	hsl(204, 49%, 50%)
HSV	hsv(204, 65%, 75%)
CMYK	cmyk(65.4%, 26.7%, 0%, 25.1%)
CIE-LAB	lab(55.76, -6.92, -33.35)
CIE-LCH	lch(55.76, 34.06, 258.28°)
OKLab	oklab(61.52% -0.0509 -0.0939)
OKLCH	oklch(61.52% 0.107 241.5)
XYZ	xyz(21.0252, 23.6738, 52.7416)
Luminance	0.2368 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428CBF #BF7542

analogous

#42BFB3 #428CBF #424DBF

triadic

#428CBF #BF428C #8CBF42

tetradic

#428CBF #B342BF #BF7542 #4DBF42

square

#428CBF #B342BF #BF7542 #4DBF42

split-complementary

#428CBF #BF424D #BFB342

monochromatic

#224965 #326B92 #428CBF #70A8CE #9DC4DE

Accessibility & contrast

On white

3.66

#428CBF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.74

#428CBF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428CBF

5.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428CBF	#FFFFFF	#000000	##000000
##428CBF	1.00	3.66	5.74	5.74
#FFFFFF	3.66	1.00	21.00	21.00
#000000	5.74	21.00	1.00	1.00
##000000	5.74	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#758CC1

Deuteranopia (green-blind)

#6480BE

Tritanopia (blue-blind)

#00999E

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #428cbf;
/* rgb */ color: rgb(66, 140, 191);
/* oklch */ color: oklch(61.5% 0.107 241.5);

Tailwind

colors: {
  custom: {
    50: '#83add2',
    500: '#428cbf',
    950: '#000000',
  },
}

SCSS

$custom: #428cbf;
$custom-light: #83add2;
$custom-dark: #000000;

JSON

{
  "hex": "#428cbf",
  "rgb": {
    "r": 66,
    "g": 140,
    "b": 191
  },
  "hsl": {
    "h": 204.48,
    "s": 49.407,
    "l": 50.392
  },
  "oklch": {
    "l": 0.61523,
    "c": 0.10678,
    "h": 241.5
  },
  "luminance": 0.23676
}

Semantic roles & 50–950 ramp

primary

#428CBF

secondary

#CAA993

accent

#874FD9

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0C1014

muted

#7D7F82

Preview Lab

Preview with #428CBF

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

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