#428DBB#428DBB

#428DBB is a mid, moderate cyan. Relative luminance 0.238; OKLCH L 61.6% C 0.102 H 238.5°. Best body text is #000000 at 5.76:1 contrast (WCAG AA passes).

Color values

HEX	#428DBB
RGB	rgb(66, 141, 187)
HSL	hsl(203, 48%, 50%)
HSV	hsv(203, 65%, 73%)
CMYK	cmyk(64.7%, 24.6%, 0%, 26.7%)
CIE-LAB	lab(55.88, -8.82, -30.88)
CIE-LCH	lch(55.88, 32.12, 254.06°)
OKLab	oklab(61.56% -0.0533 -0.0868)
OKLCH	oklch(61.56% 0.102 238.5)
XYZ	xyz(20.7378, 23.7937, 50.5038)
Luminance	0.2380 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428DBB #BB7042

analogous

#42BBAD #428DBB #4251BB

triadic

#428DBB #BB428D #8DBB42

tetradic

#428DBB #AD42BB #BB7042 #51BB42

square

#428DBB #AD42BB #BB7042 #51BB42

split-complementary

#428DBB #BB4251 #BBAD42

monochromatic

#224961 #326B8E #428DBB #6EA8CC #9CC3DC

Accessibility & contrast

On white

3.65

#428DBB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.76

#428DBB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428DBB

5.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428DBB	#FFFFFF	#000000	##000000
##428DBB	1.00	3.65	5.76	5.76
#FFFFFF	3.65	1.00	21.00	21.00
#000000	5.76	21.00	1.00	1.00
##000000	5.76	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#788DBD

Deuteranopia (green-blind)

#6781BA

Tritanopia (blue-blind)

#00999D

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #428dbb;
/* rgb */ color: rgb(66, 141, 187);
/* oklch */ color: oklch(61.6% 0.102 238.5);

Tailwind

colors: {
  custom: {
    50: '#83aecf',
    500: '#428dbb',
    950: '#000000',
  },
}

SCSS

$custom: #428dbb;
$custom-light: #83aecf;
$custom-dark: #000000;

JSON

{
  "hex": "#428dbb",
  "rgb": {
    "r": 66,
    "g": 141,
    "b": 187
  },
  "hsl": {
    "h": 202.81,
    "s": 47.826,
    "l": 49.608
  },
  "oklch": {
    "l": 0.61561,
    "c": 0.1018,
    "h": 238.5
  },
  "luminance": 0.23796
}

Semantic roles & 50–950 ramp

primary

#428DBB

secondary

#C8A691

accent

#8450D7

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0C1014

muted

#7D7F82

Preview Lab

Preview with #428DBB

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

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