#428DBC#428DBC

#428DBC is a mid, moderate cyan. Relative luminance 0.238; OKLCH L 61.6% C 0.103 H 239.0°. Best body text is #000000 at 5.77:1 contrast (WCAG AA passes).

Color values

HEX	#428DBC
RGB	rgb(66, 141, 188)
HSL	hsl(203, 48%, 50%)
HSV	hsv(203, 65%, 74%)
CMYK	cmyk(64.9%, 25%, 0%, 26.3%)
CIE-LAB	lab(55.92, -8.49, -31.39)
CIE-LCH	lch(55.92, 32.51, 254.86°)
OKLab	oklab(61.61% -0.0529 -0.0882)
OKLCH	oklch(61.61% 0.103 239)
XYZ	xyz(20.8453, 23.8367, 51.0696)
Luminance	0.2384 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428DBC #BC7142

analogous

#42BCAE #428DBC #4250BC

triadic

#428DBC #BC428D #8DBC42

tetradic

#428DBC #AE42BC #BC7142 #50BC42

square

#428DBC #AE42BC #BC7142 #50BC42

split-complementary

#428DBC #BC4250 #BCAE42

monochromatic

#224961 #326B8F #428DBC #6FA8CC #9CC4DC

Accessibility & contrast

On white

3.64

#428DBC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.77

#428DBC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428DBC

5.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428DBC	#FFFFFF	#000000	##000000
##428DBC	1.00	3.64	5.77	5.77
#FFFFFF	3.64	1.00	21.00	21.00
#000000	5.77	21.00	1.00	1.00
##000000	5.77	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#778DBE

Deuteranopia (green-blind)

#6781BB

Tritanopia (blue-blind)

#00999D

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #428dbc;
/* rgb */ color: rgb(66, 141, 188);
/* oklch */ color: oklch(61.6% 0.103 239.0);

Tailwind

colors: {
  custom: {
    50: '#83aed0',
    500: '#428dbc',
    950: '#000000',
  },
}

SCSS

$custom: #428dbc;
$custom-light: #83aed0;
$custom-dark: #000000;

JSON

{
  "hex": "#428dbc",
  "rgb": {
    "r": 66,
    "g": 141,
    "b": 188
  },
  "hsl": {
    "h": 203.115,
    "s": 48.031,
    "l": 49.804
  },
  "oklch": {
    "l": 0.61609,
    "c": 0.10287,
    "h": 239
  },
  "luminance": 0.23839
}

Semantic roles & 50–950 ramp

primary

#428DBC

secondary

#C9A791

accent

#8450D8

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0C1014

muted

#7D7F82

Preview Lab

Preview with #428DBC

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

Preview Lab → · Contrast checker → · Palette generator →