Cobalt#0047AB
#0047AB is a dark, vivid blue. Relative luminance 0.074; OKLCH L 42.8% C 0.172 H 259.7°. Best body text is #FFFFFF at 8.44:1 contrast (WCAG AA passes).
Color values
| HEX | #0047AB |
|---|---|
| RGB | rgb(0, 71, 171) |
| HSL | hsl(215, 100%, 34%) |
| HSV | hsv(215, 100%, 67%) |
| CMYK | cmyk(100%, 58.5%, 0%, 32.9%) |
| CIE-LAB | lab(32.80, 22.52, -58.44) |
| CIE-LCH | lch(32.80, 62.63, 291.07°) |
| OKLab | oklab(42.84% -0.0307 -0.1692) |
| OKLCH | oklch(42.84% 0.172 259.7) |
| XYZ | xyz(9.6012, 7.4454, 39.4512) |
| Luminance | 0.0745 (WCAG relative) |
| Temperature | cool |
| Family | blue |
Closest named colors
Cobalt
#0047AB
ΔE00 0.00
Cobalt (survey)
#1E488F
ΔE00 3.75
Sapphire
#0F52BA
ΔE00 3.85
Blue Blue
#2242C7
ΔE00 5.61
Dusk Blue
#26538D
ΔE00 5.69
Darkish Blue
#014182
ΔE00 5.75
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#0047AB #AB6400
analogous
#009CAB #0047AB #0F00AB
triadic
#0047AB #AB0047 #47AB00
tetradic
#0047AB #AB009C #AB6400 #00AB0F
square
#0047AB #AB009C #AB6400 #00AB0F
split-complementary
#0047AB #AB0F00 #9CAB00
monochromatic
#001431 #002E6E #0047AB #0060E8 #2680FF
Accessibility & contrast
On white
8.44
#0047AB on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
2.49
#0047AB on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #0047AB
8.44:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##0047AB | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##0047AB | 1.00 | 8.44 | 2.49 | 8.44 |
| #FFFFFF | 8.44 | 1.00 | 21.00 | 1.00 |
| #000000 | 2.49 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 8.44 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#0055AE
Deuteranopia (green-blind)
#0046A9
Tritanopia (blue-blind)
#006172
Achromatopsia (no color)
#4D4D4D
Related colors
#0E4098#143986#173375#192C63#182653#171F42#151933#121324#0B0B16#000000#3957B4#5668BC#6E79C5#848BCD#999DD6#AEB0DE#C2C3E6#D7D7EF#EBEBF7#FFFFFF#2047A1#2E4898#37488E#3D4985Sapphire
#0F52BA
Denim
#1560BD
Ocean Blue
#4F42B5
Royal Blue
#4169E1
Charcoal
#36454F
Slate Blue
#6A5ACD
Azure
#007FFF
Baby Blue
#89CFF0
Palettes with this color
#05445E
#189AB4
#75E6DA
#D4F1F4
Ocean Color Palette
#C0C0C0
#E8E8E8
#606060
#C0C0C0
#A7A7A7
Silver Color Palette
#708090
#C8CFD7
#38434D
#898077
#7E8C9B
Slate Gray Color Palette
#DC143C
#FFB0AD
#810019
#41AF99
#E43E4D
Crimson Color Palette
Design tokens & code
CSS
--color: #0047ab; /* rgb */ color: rgb(0, 71, 171); /* oklch */ color: oklch(42.8% 0.172 259.7);
Tailwind
colors: {
custom: {
50: '#6e79c5',
500: '#0047ab',
950: '#000000',
},
}SCSS
$custom: #0047ab; $custom-light: #6e79c5; $custom-dark: #000000;
JSON
{
"hex": "#0047ab",
"rgb": {
"r": 0,
"g": 71,
"b": 171
},
"hsl": {
"h": 215.088,
"s": 100,
"l": 33.529
},
"oklch": {
"l": 0.42842,
"c": 0.17201,
"h": 259.7
},
"luminance": 0.07447
}Semantic roles & 50–950 ramp
primary
#0047AB
secondary
#DA922D
accent
#A629FF
background
#F7F7FC
surface
#EDEDF8
border
#C8C8D1
text
#090913
muted
#7B7B82