#428BBF#428BBF

#428BBF is a mid, moderate cyan. Relative luminance 0.234; OKLCH L 61.3% C 0.107 H 242.4°. Best body text is #000000 at 5.68:1 contrast (WCAG AA passes).

Color values

HEX	#428BBF
RGB	rgb(66, 139, 191)
HSL	hsl(205, 49%, 50%)
HSV	hsv(205, 65%, 75%)
CMYK	cmyk(65.4%, 27.2%, 0%, 25.1%)
CIE-LAB	lab(55.46, -6.34, -33.81)
CIE-LCH	lch(55.46, 34.40, 259.37°)
OKLab	oklab(61.29% -0.0498 -0.0952)
OKLCH	oklch(61.29% 0.107 242.4)
XYZ	xyz(20.8798, 23.3829, 52.6931)
Luminance	0.2339 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BBF #BF7642

analogous

#42BFB4 #428BBF #424CBF

triadic

#428BBF #BF428B #8BBF42

tetradic

#428BBF #B442BF #BF7642 #4CBF42

square

#428BBF #B442BF #BF7642 #4CBF42

split-complementary

#428BBF #BF424C #BFB442

monochromatic

#224965 #326A92 #428BBF #70A7CE #9DC3DE

Accessibility & contrast

On white

3.70

#428BBF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.68

#428BBF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BBF

5.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BBF	#FFFFFF	#000000	##000000
##428BBF	1.00	3.70	5.68	5.68
#FFFFFF	3.70	1.00	21.00	21.00
#000000	5.68	21.00	1.00	1.00
##000000	5.68	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#748CC1

Deuteranopia (green-blind)

#627FBE

Tritanopia (blue-blind)

#00989D

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #428bbf;
/* rgb */ color: rgb(66, 139, 191);
/* oklch */ color: oklch(61.3% 0.107 242.4);

Tailwind

colors: {
  custom: {
    50: '#83acd2',
    500: '#428bbf',
    950: '#000000',
  },
}

SCSS

$custom: #428bbf;
$custom-light: #83acd2;
$custom-dark: #000000;

JSON

{
  "hex": "#428bbf",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 191
  },
  "hsl": {
    "h": 204.96,
    "s": 49.407,
    "l": 50.392
  },
  "oklch": {
    "l": 0.61289,
    "c": 0.10747,
    "h": 242.4
  },
  "luminance": 0.23385
}

Semantic roles & 50–950 ramp

primary

#428BBF

secondary

#CAAA93

accent

#884FD9

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0C1014

muted

#7D7F82

Preview Lab

Preview with #428BBF

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

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