#428BB1#428BB1

#428BB1 is a mid, moderate cyan. Relative luminance 0.228; OKLCH L 60.6% C 0.093 H 233.9°. Best body text is #000000 at 5.56:1 contrast (WCAG AA passes).

Color values

HEX	#428BB1
RGB	rgb(66, 139, 177)
HSL	hsl(201, 46%, 48%)
HSV	hsv(201, 63%, 69%)
CMYK	cmyk(62.7%, 21.5%, 0%, 30.6%)
CIE-LAB	lab(54.86, -10.99, -26.76)
CIE-LCH	lch(54.86, 28.93, 247.68°)
OKLab	oklab(60.61% -0.0546 -0.0749)
OKLCH	oklch(60.61% 0.093 233.9)
XYZ	xyz(19.4121, 22.7959, 44.9635)
Luminance	0.2280 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BB1 #B16842

analogous

#42B1A0 #428BB1 #4253B1

triadic

#428BB1 #B1428B #8BB142

tetradic

#428BB1 #A042B1 #B16842 #53B142

square

#428BB1 #A042B1 #B16842 #53B142

split-complementary

#428BB1 #B14253 #B1A042

monochromatic

#214558 #316884 #428BB1 #69A7C7 #96C1D8

Accessibility & contrast

On white

3.78

#428BB1 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.56

#428BB1 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BB1

5.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BB1	#FFFFFF	#000000	##000000
##428BB1	1.00	3.78	5.56	5.56
#FFFFFF	3.78	1.00	21.00	21.00
#000000	5.56	21.00	1.00	1.00
##000000	5.56	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#798AB3

Deuteranopia (green-blind)

#697EB0

Tritanopia (blue-blind)

#009598

Achromatopsia (no color)

#838383

Design tokens & code

CSS

--color: #428bb1;
/* rgb */ color: rgb(66, 139, 177);
/* oklch */ color: oklch(60.6% 0.093 233.9);

Tailwind

colors: {
  custom: {
    50: '#81acc8',
    500: '#428bb1',
    950: '#000000',
  },
}

SCSS

$custom: #428bb1;
$custom-light: #81acc8;
$custom-dark: #000000;

JSON

{
  "hex": "#428bb1",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 177
  },
  "hsl": {
    "h": 200.541,
    "s": 45.679,
    "l": 47.647
  },
  "oklch": {
    "l": 0.60612,
    "c": 0.09271,
    "h": 233.9
  },
  "luminance": 0.22798
}

Semantic roles & 50–950 ramp

primary

#428BB1

secondary

#C39F8B

accent

#7F52D5

background

#F8FAFC

surface

#EFF4F8

border

#CACED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428BB1

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

Preview Lab → · Contrast checker → · Palette generator →