#428BB9#428BB9
#428BB9 is a mid, moderate cyan. Relative luminance 0.231; OKLCH L 61.0% C 0.101 H 239.1°. Best body text is #000000 at 5.63:1 contrast (WCAG AA passes).
Color values
| HEX | #428BB9 |
|---|---|
| RGB | rgb(66, 139, 185) |
| HSL | hsl(203, 47%, 49%) |
| HSV | hsv(203, 64%, 73%) |
| CMYK | cmyk(64.3%, 24.9%, 0%, 27.5%) |
| CIE-LAB | lab(55.20, -8.35, -30.80) |
| CIE-LCH | lch(55.20, 31.92, 254.83°) |
| OKLab | oklab(60.99% -0.0518 -0.0865) |
| OKLCH | oklch(60.99% 0.101 239.1) |
| XYZ | xyz(20.2330, 23.1242, 49.2867) |
| Luminance | 0.2313 (WCAG relative) |
| Temperature | cool |
| Family | cyan |
Closest named colors
Cool Blue
#4984B8
ΔE00 3.77
Water Blue
#0E87CC
ΔE00 3.84
Steel Blue
#4682B4
ΔE00 3.92
Dusty Blue
#5A86AD
ΔE00 4.32
Off Blue
#5684AE
ΔE00 4.45
Cerulean (survey)
#0485D1
ΔE00 4.71
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#428BB9 #B97042
analogous
#42B9AC #428BB9 #4250B9
triadic
#428BB9 #B9428B #8BB942
tetradic
#428BB9 #AC42B9 #B97042 #50B942
square
#428BB9 #AC42B9 #B97042 #50B942
split-complementary
#428BB9 #B94250 #B9AC42
monochromatic
#22475F #32698C #428BB9 #6DA7CB #9AC2DB
Accessibility & contrast
On white
3.73
#428BB9 on #FFFFFF
AA ✗AA large ✓AAA ✗
On black
5.63
#428BB9 on #000000
AA ✓AA large ✓AAA ✗
Best text color
#000000 on #428BB9
5.63:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##428BB9 | #FFFFFF | #000000 | ##000000 |
|---|---|---|---|---|
| ##428BB9 | 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)
#768BBB
Deuteranopia (green-blind)
#667FB8
Tritanopia (blue-blind)
#00979B
Achromatopsia (no color)
#848484
Design tokens & code
CSS
--color: #428bb9; /* rgb */ color: rgb(66, 139, 185); /* oklch */ color: oklch(61.0% 0.101 239.1);
Tailwind
colors: {
custom: {
50: '#82acce',
500: '#428bb9',
950: '#000000',
},
}SCSS
$custom: #428bb9; $custom-light: #82acce; $custom-dark: #000000;
JSON
{
"hex": "#428bb9",
"rgb": {
"r": 66,
"g": 139,
"b": 185
},
"hsl": {
"h": 203.193,
"s": 47.41,
"l": 49.216
},
"oklch": {
"l": 0.60993,
"c": 0.10087,
"h": 239.1
},
"luminance": 0.23126
}Semantic roles & 50–950 ramp
primary
#428BB9
secondary
#C7A590
accent
#8551D7
background
#F8FAFC
surface
#F0F4F9
border
#CBCED2
text
#0B1013
muted
#7C7F82