#183A8D#183A8D
#183A8D is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.9% C 0.144 H 263.9°. Best body text is #FFFFFF at 10.35:1 contrast (WCAG AA passes).
Color values
| HEX | #183A8D |
|---|---|
| RGB | rgb(24, 58, 141) |
| HSL | hsl(223, 71%, 32%) |
| HSV | hsv(223, 83%, 55%) |
| CMYK | cmyk(83%, 58.9%, 0%, 44.7%) |
| CIE-LAB | lab(27.14, 20.56, -49.44) |
| CIE-LCH | lch(27.14, 53.55, 292.58°) |
| OKLab | oklab(37.93% -0.0152 -0.1428) |
| OKLCH | oklch(37.93% 0.144 263.9) |
| XYZ | xyz(6.6957, 5.1426, 25.8339) |
| Luminance | 0.0514 (WCAG relative) |
| Temperature | cool |
| Family | blue |
Closest named colors
Darkish Blue
#014182
ΔE00 4.71
Cobalt (survey)
#1E488F
ΔE00 4.78
Sapphire (survey)
#2138AB
ΔE00 5.10
Cobalt
#0047AB
ΔE00 5.52
Twilight Blue
#0A437A
ΔE00 5.89
Marine Blue
#01386A
ΔE00 6.13
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#183A8D #8D6B18
analogous
#18758D #183A8D #30188D
triadic
#183A8D #8D183A #3A8D18
tetradic
#183A8D #8D1875 #8D6B18 #188D30
square
#183A8D #8D1875 #8D6B18 #188D30
split-complementary
#183A8D #8D3018 #758D18
monochromatic
#060F24 #0F2459 #183A8D #2150C1 #416FDF
Accessibility & contrast
On white
10.35
#183A8D on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
2.03
#183A8D on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #183A8D
10.35:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##183A8D | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##183A8D | 1.00 | 10.35 | 2.03 | 10.35 |
| #FFFFFF | 10.35 | 1.00 | 21.00 | 1.00 |
| #000000 | 2.03 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 10.35 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#004690
Deuteranopia (green-blind)
#003B8B
Tritanopia (blue-blind)
#004F5D
Achromatopsia (no color)
#404040
Design tokens & code
CSS
--color: #183a8d; /* rgb */ color: rgb(24, 58, 141); /* oklch */ color: oklch(37.9% 0.144 263.9);
Tailwind
colors: {
custom: {
50: '#6a6faf',
500: '#183a8d',
950: '#000000',
},
}SCSS
$custom: #183a8d; $custom-light: #6a6faf; $custom-dark: #000000;
JSON
{
"hex": "#183a8d",
"rgb": {
"r": 24,
"g": 58,
"b": 141
},
"hsl": {
"h": 222.564,
"s": 70.909,
"l": 32.353
},
"oklch": {
"l": 0.37932,
"c": 0.14366,
"h": 263.9
},
"luminance": 0.05143
}Semantic roles & 50–950 ramp
primary
#183A8D
secondary
#BF9B42
accent
#B93AEE
background
#F6F6FA
surface
#ECECF5
border
#C7C7CF
text
#080710
muted
#7A7A7F