#173A5B#173A5B
#173A5B is a dark, moderate cyan. Relative luminance 0.040; OKLCH L 34.0% C 0.071 H 249.5°. Best body text is #FFFFFF at 11.71:1 contrast (WCAG AA passes).
Color values
| HEX | #173A5B |
|---|---|
| RGB | rgb(23, 58, 91) |
| HSL | hsl(209, 60%, 22%) |
| HSV | hsv(209, 75%, 36%) |
| CMYK | cmyk(74.7%, 36.3%, 0%, 64.3%) |
| CIE-LAB | lab(23.55, -0.19, -23.42) |
| CIE-LCH | lch(23.55, 23.42, 269.52°) |
| OKLab | oklab(34.03% -0.0248 -0.0664) |
| OKLCH | oklch(34.03% 0.071 249.5) |
| XYZ | xyz(3.7540, 3.9632, 10.4626) |
| Luminance | 0.0396 (WCAG relative) |
| Temperature | cool |
| Family | cyan |
Closest named colors
Marine Blue
#01386A
ΔE00 3.18
Twilight Blue
#0A437A
ΔE00 4.94
Marine
#042E60
ΔE00 5.06
Prussian Blue
#004577
ΔE00 5.10
Darkish Blue
#014182
ΔE00 5.54
Dark Slate Blue
#214761
ΔE00 5.58
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#173A5B #5B3817
analogous
#175B5A #173A5B #17185B
triadic
#173A5B #5B173A #3A5B17
tetradic
#173A5B #5A175B #5B3817 #185B17
square
#173A5B #5A175B #5B3817 #185B17
split-complementary
#173A5B #5B1718 #5B5A17
monochromatic
#061018 #0B1B2A #173A5B #23598C #3078BD
Accessibility & contrast
On white
11.71
#173A5B on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
1.79
#173A5B on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #173A5B
11.71:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##173A5B | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##173A5B | 1.00 | 11.71 | 1.79 | 11.71 |
| #FFFFFF | 11.71 | 1.00 | 21.00 | 1.00 |
| #000000 | 1.79 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 11.71 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#2B3C5C
Deuteranopia (green-blind)
#22355A
Tritanopia (blue-blind)
#004246
Achromatopsia (no color)
#383838
Design tokens & code
CSS
--color: #173a5b; /* rgb */ color: rgb(23, 58, 91); /* oklch */ color: oklch(34.0% 0.071 249.5);
Tailwind
colors: {
custom: {
50: '#5d6f89',
500: '#173a5b',
950: '#000000',
},
}SCSS
$custom: #173a5b; $custom-light: #5d6f89; $custom-dark: #000000;
JSON
{
"hex": "#173a5b",
"rgb": {
"r": 23,
"g": 58,
"b": 91
},
"hsl": {
"h": 209.118,
"s": 59.649,
"l": 22.353
},
"oklch": {
"l": 0.34034,
"c": 0.07089,
"h": 249.5
},
"luminance": 0.03964
}Semantic roles & 50–950 ramp
primary
#173A5B
secondary
#92663C
accent
#9245E3
background
#F5F6F8
surface
#E9ECF0
border
#C5C7CB
text
#05070B
muted
#797A7C