#428BB5#428BB5

#428BB5 is a mid, moderate cyan. Relative luminance 0.230; OKLCH L 60.8% C 0.097 H 236.6°. Best body text is #000000 at 5.59:1 contrast (WCAG AA passes).

Color values

HEX	#428BB5
RGB	rgb(66, 139, 181)
HSL	hsl(202, 47%, 48%)
HSV	hsv(202, 64%, 71%)
CMYK	cmyk(63.5%, 23.2%, 0%, 29%)
CIE-LAB	lab(55.03, -9.67, -28.79)
CIE-LCH	lch(55.03, 30.37, 251.42°)
OKLab	oklab(60.8% -0.0532 -0.0807)
OKLCH	oklch(60.8% 0.097 236.6)
XYZ	xyz(19.8167, 22.9577, 47.0940)
Luminance	0.2296 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BB5 #B56C42

analogous

#42B5A5 #428BB5 #4251B5

triadic

#428BB5 #B5428B #8BB542

tetradic

#428BB5 #A542B5 #B56C42 #51B542

square

#428BB5 #A542B5 #B56C42 #51B542

split-complementary

#428BB5 #B54251 #B5A542

monochromatic

#21465B #326988 #428BB5 #6BA7C9 #98C2D9

Accessibility & contrast

On white

3.76

#428BB5 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.59

#428BB5 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BB5

5.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BB5	#FFFFFF	#000000	##000000
##428BB5	1.00	3.76	5.59	5.59
#FFFFFF	3.76	1.00	21.00	21.00
#000000	5.59	21.00	1.00	1.00
##000000	5.59	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#778AB7

Deuteranopia (green-blind)

#677FB4

Tritanopia (blue-blind)

#009699

Achromatopsia (no color)

#848484

Design tokens & code

CSS

--color: #428bb5;
/* rgb */ color: rgb(66, 139, 181);
/* oklch */ color: oklch(60.8% 0.097 236.6);

Tailwind

colors: {
  custom: {
    50: '#82accb',
    500: '#428bb5',
    950: '#000000',
  },
}

SCSS

$custom: #428bb5;
$custom-light: #82accb;
$custom-dark: #000000;

JSON

{
  "hex": "#428bb5",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 181
  },
  "hsl": {
    "h": 201.913,
    "s": 46.559,
    "l": 48.431
  },
  "oklch": {
    "l": 0.608,
    "c": 0.09668,
    "h": 236.6
  },
  "luminance": 0.2296
}

Semantic roles & 50–950 ramp

primary

#428BB5

secondary

#C5A28E

accent

#8252D6

background

#F8FAFC

surface

#F0F4F8

border

#CBCED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428BB5

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

Preview Lab → · Contrast checker → · Palette generator →