#183F5E#183F5E
#183F5E is a dark, moderate cyan. Relative luminance 0.046; OKLCH L 35.6% C 0.070 H 245.6°. Best body text is #FFFFFF at 10.99:1 contrast (WCAG AA passes).
Color values
| HEX | #183F5E |
|---|---|
| RGB | rgb(24, 63, 94) |
| HSL | hsl(207, 59%, 23%) |
| HSV | hsv(207, 74%, 37%) |
| CMYK | cmyk(74.5%, 33%, 0%, 63.1%) |
| CIE-LAB | lab(25.43, -2.19, -22.40) |
| CIE-LCH | lch(25.43, 22.51, 264.42°) |
| OKLab | oklab(35.58% -0.0287 -0.0634) |
| OKLCH | oklch(35.58% 0.07 245.6) |
| XYZ | xyz(4.1738, 4.5569, 11.2471) |
| Luminance | 0.0456 (WCAG relative) |
| Temperature | cool |
| Family | cyan |
Closest named colors
Dark Slate Blue
#214761
ΔE00 3.44
Prussian Blue
#004577
ΔE00 4.20
Dark Grey Blue
#29465B
ΔE00 4.36
Marine Blue
#01386A
ΔE00 4.41
Twilight Blue
#0A437A
ΔE00 4.59
Dark Blue Grey
#1F3B4D
ΔE00 5.04
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#183F5E #5E3718
analogous
#185E5A #183F5E #181C5E
triadic
#183F5E #5E183F #3F5E18
tetradic
#183F5E #5A185E #5E3718 #1C5E18
square
#183F5E #5A185E #5E3718 #1C5E18
split-complementary
#183F5E #5E181C #5E5A18
monochromatic
#061018 #0C1E2D #183F5E #24608F #3180C0
Accessibility & contrast
On white
10.99
#183F5E on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
1.91
#183F5E on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #183F5E
10.99:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##183F5E | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##183F5E | 1.00 | 10.99 | 1.91 | 10.99 |
| #FFFFFF | 10.99 | 1.00 | 21.00 | 1.00 |
| #000000 | 1.91 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 10.99 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#31405F
Deuteranopia (green-blind)
#27395D
Tritanopia (blue-blind)
#00464A
Achromatopsia (no color)
#3C3C3C
Design tokens & code
CSS
--color: #183f5e; /* rgb */ color: rgb(24, 63, 94); /* oklch */ color: oklch(35.6% 0.070 245.6);
Tailwind
colors: {
custom: {
50: '#5f738c',
500: '#183f5e',
950: '#000000',
},
}SCSS
$custom: #183f5e; $custom-light: #5f738c; $custom-dark: #000000;
JSON
{
"hex": "#183f5e",
"rgb": {
"r": 24,
"g": 63,
"b": 94
},
"hsl": {
"h": 206.571,
"s": 59.322,
"l": 23.137
},
"oklch": {
"l": 0.35582,
"c": 0.06959,
"h": 245.6
},
"luminance": 0.04557
}Semantic roles & 50–950 ramp
primary
#183F5E
secondary
#94643D
accent
#8B45E3
background
#F5F7F8
surface
#EAEDF0
border
#C6C8CB
text
#05080C
muted
#797B7D