#183A8B#183A8B
#183A8B is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.8% C 0.141 H 263.7°. Best body text is #FFFFFF at 10.41:1 contrast (WCAG AA passes).
Color values
| HEX | #183A8B |
|---|---|
| RGB | rgb(24, 58, 139) |
| HSL | hsl(222, 71%, 32%) |
| HSV | hsv(222, 83%, 55%) |
| CMYK | cmyk(82.7%, 58.3%, 0%, 45.5%) |
| CIE-LAB | lab(26.97, 19.75, -48.47) |
| CIE-LCH | lch(26.97, 52.34, 292.17°) |
| OKLab | oklab(37.76% -0.0154 -0.14) |
| OKLCH | oklch(37.76% 0.141 263.7) |
| XYZ | xyz(6.5483, 5.0836, 25.0572) |
| Luminance | 0.0508 (WCAG relative) |
| Temperature | cool |
| Family | blue |
Closest named colors
Darkish Blue
#014182
ΔE00 4.52
Cobalt (survey)
#1E488F
ΔE00 4.72
Sapphire (survey)
#2138AB
ΔE00 5.41
Cobalt
#0047AB
ΔE00 5.67
Twilight Blue
#0A437A
ΔE00 5.69
Marine Blue
#01386A
ΔE00 5.86
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#183A8B #8B6918
analogous
#18748B #183A8B #30188B
triadic
#183A8B #8B183A #3A8B18
tetradic
#183A8B #8B1874 #8B6918 #188B30
square
#183A8B #8B1874 #8B6918 #188B30
split-complementary
#183A8B #8B3018 #748B18
monochromatic
#060E23 #0F2457 #183A8B #2150BF #3F6EDE
Accessibility & contrast
On white
10.41
#183A8B on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
2.02
#183A8B on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #183A8B
10.41:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##183A8B | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##183A8B | 1.00 | 10.41 | 2.02 | 10.41 |
| #FFFFFF | 10.41 | 1.00 | 21.00 | 1.00 |
| #000000 | 2.02 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 10.41 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#00458E
Deuteranopia (green-blind)
#003B89
Tritanopia (blue-blind)
#004E5C
Achromatopsia (no color)
#404040
Design tokens & code
CSS
--color: #183a8b; /* rgb */ color: rgb(24, 58, 139); /* oklch */ color: oklch(37.8% 0.141 263.7);
Tailwind
colors: {
custom: {
50: '#6a6fae',
500: '#183a8b',
950: '#000000',
},
}SCSS
$custom: #183a8b; $custom-light: #6a6fae; $custom-dark: #000000;
JSON
{
"hex": "#183a8b",
"rgb": {
"r": 24,
"g": 58,
"b": 139
},
"hsl": {
"h": 222.261,
"s": 70.552,
"l": 31.961
},
"oklch": {
"l": 0.37756,
"c": 0.14084,
"h": 263.7
},
"luminance": 0.05084
}Semantic roles & 50–950 ramp
primary
#183A8B
secondary
#BE9940
accent
#B83AED
background
#F6F6FA
surface
#ECECF4
border
#C7C7CE
text
#080710
muted
#7A7A7F