#428BBA#428BBA
#428BBA is a mid, moderate cyan. Relative luminance 0.232; OKLCH L 61.0% C 0.102 H 239.7°. Best body text is #000000 at 5.63:1 contrast (WCAG AA passes).
Color values
| HEX | #428BBA |
|---|---|
| RGB | rgb(66, 139, 186) |
| HSL | hsl(204, 48%, 49%) |
| HSV | hsv(204, 65%, 73%) |
| CMYK | cmyk(64.5%, 25.3%, 0%, 27.1%) |
| CIE-LAB | lab(55.24, -8.02, -31.31) |
| CIE-LCH | lch(55.24, 32.32, 255.63°) |
| OKLab | oklab(61.04% -0.0515 -0.088) |
| OKLCH | oklch(61.04% 0.102 239.7) |
| XYZ | xyz(20.3389, 23.1666, 49.8446) |
| Luminance | 0.2317 (WCAG relative) |
| Temperature | cool |
| Family | cyan |
Closest named colors
Cool Blue
#4984B8
ΔE00 3.61
Water Blue
#0E87CC
ΔE00 3.66
Steel Blue
#4682B4
ΔE00 3.81
Dusty Blue
#5A86AD
ΔE00 4.27
Off Blue
#5684AE
ΔE00 4.38
Cerulean (survey)
#0485D1
ΔE00 4.50
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#428BBA #BA7142
analogous
#42BAAD #428BBA #424FBA
triadic
#428BBA #BA428B #8BBA42
tetradic
#428BBA #AD42BA #BA7142 #4FBA42
square
#428BBA #AD42BA #BA7142 #4FBA42
split-complementary
#428BBA #BA424F #BAAD42
monochromatic
#224760 #32698D #428BBA #6EA7CB #9BC2DB
Accessibility & contrast
On white
3.73
#428BBA on #FFFFFF
AA ✗AA large ✓AAA ✗
On black
5.63
#428BBA on #000000
AA ✓AA large ✓AAA ✗
Best text color
#000000 on #428BBA
5.63:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##428BBA | #FFFFFF | #000000 | ##000000 |
|---|---|---|---|---|
| ##428BBA | 1.00 | 3.73 | 5.63 | 5.63 |
| #FFFFFF | 3.73 | 1.00 | 21.00 | 21.00 |
| #000000 | 5.63 | 21.00 | 1.00 | 1.00 |
| ##000000 | 5.63 | 21.00 | 1.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#758BBC
Deuteranopia (green-blind)
#657FB9
Tritanopia (blue-blind)
#00979B
Achromatopsia (no color)
#848484
Design tokens & code
CSS
--color: #428bba; /* rgb */ color: rgb(66, 139, 186); /* oklch */ color: oklch(61.0% 0.102 239.7);
Tailwind
colors: {
custom: {
50: '#82accf',
500: '#428bba',
950: '#000000',
},
}SCSS
$custom: #428bba; $custom-light: #82accf; $custom-dark: #000000;
JSON
{
"hex": "#428bba",
"rgb": {
"r": 66,
"g": 139,
"b": 186
},
"hsl": {
"h": 203.5,
"s": 47.619,
"l": 49.412
},
"oklch": {
"l": 0.61041,
"c": 0.10194,
"h": 239.7
},
"luminance": 0.23169
}Semantic roles & 50–950 ramp
primary
#428BBA
secondary
#C8A690
accent
#8551D7
background
#F8FAFC
surface
#F0F4F9
border
#CBCED2
text
#0C1013
muted
#7D7F82