#3773CC#3773CC
#3773CC is a mid, vivid blue. Relative luminance 0.174; OKLCH L 56.2% C 0.151 H 258.3°. Best body text is #FFFFFF at 4.68:1 contrast (WCAG AA passes).
Color values
| HEX | #3773CC |
|---|---|
| RGB | rgb(55, 115, 204) |
| HSL | hsl(216, 59%, 51%) |
| HSV | hsv(216, 73%, 80%) |
| CMYK | cmyk(73%, 43.6%, 0%, 20%) |
| CIE-LAB | lab(48.80, 10.99, -51.79) |
| CIE-LCH | lch(48.80, 52.94, 281.98°) |
| OKLab | oklab(56.18% -0.0306 -0.1482) |
| OKLCH | oklch(56.18% 0.151 258.3) |
| XYZ | xyz(18.6014, 17.4313, 59.4993) |
| Luminance | 0.1743 (WCAG relative) |
| Temperature | cool |
| Family | blue |
Closest named colors
Windows Blue
#3778BF
ΔE00 2.81
Medium Blue
#2C6FBB
ΔE00 3.03
Cerulean Blue
#056EEE
ΔE00 3.68
Bluish
#2976BB
ΔE00 4.01
Flat Blue
#3C73A8
ΔE00 4.24
Deep Sky Blue
#0D75F8
ΔE00 4.52
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#3773CC #CC9037
analogous
#37BDCC #3773CC #4537CC
triadic
#3773CC #CC3773 #73CC37
tetradic
#3773CC #CC37BD #CC9037 #37CC45
square
#3773CC #CC37BD #CC9037 #37CC45
split-complementary
#3773CC #CC4537 #BDCC37
monochromatic
#1C3C6D #28579E #3773CC #6895D8 #99B7E5
Accessibility & contrast
On white
4.68
#3773CC on #FFFFFF
AA ✓AA large ✓AAA ✗
On black
4.49
#3773CC on #000000
AA ✗AA large ✓AAA ✗
Best text color
#FFFFFF on #3773CC
4.68:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##3773CC | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##3773CC | 1.00 | 4.68 | 4.49 | 4.68 |
| #FFFFFF | 4.68 | 1.00 | 21.00 | 1.00 |
| #000000 | 4.49 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 4.68 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#477BCF
Deuteranopia (green-blind)
#2B6ECA
Tritanopia (blue-blind)
#008895
Achromatopsia (no color)
#747474
Design tokens & code
CSS
--color: #3773cc; /* rgb */ color: rgb(55, 115, 204); /* oklch */ color: oklch(56.2% 0.151 258.3);
Tailwind
colors: {
custom: {
50: '#819adc',
500: '#3773cc',
950: '#000000',
},
}SCSS
$custom: #3773cc; $custom-light: #819adc; $custom-dark: #000000;
JSON
{
"hex": "#3773cc",
"rgb": {
"r": 55,
"g": 115,
"b": 204
},
"hsl": {
"h": 215.839,
"s": 59.363,
"l": 50.784
},
"oklch": {
"l": 0.56184,
"c": 0.15135,
"h": 258.3
},
"luminance": 0.17433
}Semantic roles & 50–950 ramp
primary
#3773CC
secondary
#D0B68E
accent
#A345E3
background
#F8F9FD
surface
#F0F2FB
border
#CBCCD4
text
#0C0E15
muted
#7D7E83