#428EBB#428EBB

#428EBB is a mid, moderate cyan. Relative luminance 0.241; OKLCH L 61.8% C 0.101 H 237.5°. Best body text is #000000 at 5.82:1 contrast (WCAG AA passes).

Color values

HEX	#428EBB
RGB	rgb(66, 142, 187)
HSL	hsl(202, 48%, 50%)
HSV	hsv(202, 65%, 73%)
CMYK	cmyk(64.7%, 24.1%, 0%, 26.7%)
CIE-LAB	lab(56.18, -9.39, -30.42)
CIE-LCH	lch(56.18, 31.84, 252.85°)
OKLab	oklab(61.8% -0.0543 -0.0854)
OKLCH	oklch(61.8% 0.101 237.5)
XYZ	xyz(20.8860, 24.0900, 50.5532)
Luminance	0.2409 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428EBB #BB6F42

analogous

#42BBAC #428EBB #4252BB

triadic

#428EBB #BB428E #8EBB42

tetradic

#428EBB #AC42BB #BB6F42 #52BB42

square

#428EBB #AC42BB #BB6F42 #52BB42

split-complementary

#428EBB #BB4252 #BBAC42

monochromatic

#224961 #326C8E #428EBB #6EA9CC #9CC4DC

Accessibility & contrast

On white

3.61

#428EBB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.82

#428EBB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428EBB

5.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428EBB	#FFFFFF	#000000	##000000
##428EBB	1.00	3.61	5.82	5.82
#FFFFFF	3.61	1.00	21.00	21.00
#000000	5.82	21.00	1.00	1.00
##000000	5.82	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#798DBD

Deuteranopia (green-blind)

#6881BA

Tritanopia (blue-blind)

#009A9D

Achromatopsia (no color)

#878787

Design tokens & code

CSS

--color: #428ebb;
/* rgb */ color: rgb(66, 142, 187);
/* oklch */ color: oklch(61.8% 0.101 237.5);

Tailwind

colors: {
  custom: {
    50: '#83afcf',
    500: '#428ebb',
    950: '#000000',
  },
}

SCSS

$custom: #428ebb;
$custom-light: #83afcf;
$custom-dark: #000000;

JSON

{
  "hex": "#428ebb",
  "rgb": {
    "r": 66,
    "g": 142,
    "b": 187
  },
  "hsl": {
    "h": 202.314,
    "s": 47.826,
    "l": 49.608
  },
  "oklch": {
    "l": 0.61797,
    "c": 0.10123,
    "h": 237.5
  },
  "luminance": 0.24092
}

Semantic roles & 50–950 ramp

primary

#428EBB

secondary

#C8A591

accent

#8350D7

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0C1014

muted

#7D7F82

Preview Lab

Preview with #428EBB

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

Preview Lab → · Contrast checker → · Palette generator →