#428DB3#428DB3

#428DB3 is a mid, moderate cyan. Relative luminance 0.235; OKLCH L 61.2% C 0.094 H 233.3°. Best body text is #000000 at 5.69:1 contrast (WCAG AA passes).

Color values

HEX	#428DB3
RGB	rgb(66, 141, 179)
HSL	hsl(200, 46%, 48%)
HSV	hsv(200, 63%, 70%)
CMYK	cmyk(63.1%, 21.2%, 0%, 29.8%)
CIE-LAB	lab(55.54, -11.45, -26.85)
CIE-LCH	lch(55.54, 29.19, 246.90°)
OKLab	oklab(61.18% -0.0561 -0.0751)
OKLCH	oklch(61.18% 0.094 233.3)
XYZ	xyz(19.9052, 23.4607, 46.1184)
Luminance	0.2346 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428DB3 #B36842

analogous

#42B3A0 #428DB3 #4254B3

triadic

#428DB3 #B3428D #8DB342

tetradic

#428DB3 #A042B3 #B36842 #54B342

square

#428DB3 #A042B3 #B36842 #54B342

split-complementary

#428DB3 #B34254 #B3A042

monochromatic

#21475A #326A86 #428DB3 #6AA8C8 #97C2D9

Accessibility & contrast

On white

3.69

#428DB3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.69

#428DB3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428DB3

5.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428DB3	#FFFFFF	#000000	##000000
##428DB3	1.00	3.69	5.69	5.69
#FFFFFF	3.69	1.00	21.00	21.00
#000000	5.69	21.00	1.00	1.00
##000000	5.69	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7A8CB5

Deuteranopia (green-blind)

#6B80B2

Tritanopia (blue-blind)

#00979A

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #428db3;
/* rgb */ color: rgb(66, 141, 179);
/* oklch */ color: oklch(61.2% 0.094 233.3);

Tailwind

colors: {
  custom: {
    50: '#81aeca',
    500: '#428db3',
    950: '#000000',
  },
}

SCSS

$custom: #428db3;
$custom-light: #81aeca;
$custom-dark: #000000;

JSON

{
  "hex": "#428db3",
  "rgb": {
    "r": 66,
    "g": 141,
    "b": 179
  },
  "hsl": {
    "h": 200.177,
    "s": 46.122,
    "l": 48.039
  },
  "oklch": {
    "l": 0.61182,
    "c": 0.09376,
    "h": 233.3
  },
  "luminance": 0.23463
}

Semantic roles & 50–950 ramp

primary

#428DB3

secondary

#C49F8C

accent

#7E52D6

background

#F8FAFC

surface

#F0F4F8

border

#CBCED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428DB3

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

Preview Lab → · Contrast checker → · Palette generator →