#173CB4#173CB4
#173CB4 is a dark, vivid blue. Relative luminance 0.067; OKLCH L 42.0% C 0.194 H 265.1°. Best body text is #FFFFFF at 8.97:1 contrast (WCAG AA passes).
Color values
| HEX | #173CB4 |
|---|---|
| RGB | rgb(23, 60, 180) |
| HSL | hsl(226, 77%, 40%) |
| HSV | hsv(226, 87%, 71%) |
| CMYK | cmyk(87.2%, 66.7%, 0%, 29.4%) |
| CIE-LAB | lab(31.13, 34.48, -66.52) |
| CIE-LCH | lch(31.13, 74.93, 297.40°) |
| OKLab | oklab(41.97% -0.0167 -0.1928) |
| OKLCH | oklch(41.97% 0.194 265.1) |
| XYZ | xyz(10.2045, 6.7079, 43.9281) |
| Luminance | 0.0671 (WCAG relative) |
| Temperature | cool |
| Family | blue |
Closest named colors
Sapphire (survey)
#2138AB
ΔE00 1.73
Blue Blue
#2242C7
ΔE00 3.15
Cobalt
#0047AB
ΔE00 4.74
Blue (survey)
#0343DF
ΔE00 5.77
Ocean Blue
#4F42B5
ΔE00 6.08
Blueberry
#464196
ΔE00 6.69
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#173CB4 #B48F17
analogous
#178AB4 #173CB4 #4117B4
triadic
#173CB4 #B4173C #3CB417
tetradic
#173CB4 #B4178A #B48F17 #17B441
square
#173CB4 #B4178A #B48F17 #17B441
split-complementary
#173CB4 #B44117 #8AB417
monochromatic
#091847 #102A7E #173CB4 #2552E3 #5B7DEA
Accessibility & contrast
On white
8.97
#173CB4 on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
2.34
#173CB4 on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #173CB4
8.97:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##173CB4 | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##173CB4 | 1.00 | 8.97 | 2.34 | 8.97 |
| #FFFFFF | 8.97 | 1.00 | 21.00 | 1.00 |
| #000000 | 2.34 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 8.97 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#0051B8
Deuteranopia (green-blind)
#0042B2
Tritanopia (blue-blind)
#005D73
Achromatopsia (no color)
#494949
Design tokens & code
CSS
--color: #173cb4; /* rgb */ color: rgb(23, 60, 180); /* oklch */ color: oklch(42.0% 0.194 265.1);
Tailwind
colors: {
custom: {
50: '#7571cc',
500: '#173cb4',
950: '#000000',
},
}SCSS
$custom: #173cb4; $custom-light: #7571cc; $custom-dark: #000000;
JSON
{
"hex": "#173cb4",
"rgb": {
"r": 23,
"g": 60,
"b": 180
},
"hsl": {
"h": 225.86,
"s": 77.34,
"l": 39.804
},
"oklch": {
"l": 0.41965,
"c": 0.19356,
"h": 265.1
},
"luminance": 0.06709
}Semantic roles & 50–950 ramp
primary
#173CB4
secondary
#CEB259
accent
#C734F4
background
#F7F6FC
surface
#EEECF9
border
#C9C7D2
text
#0A0713
muted
#7C7A82