Cobalt
#04218B · Cobalt
#04218B is Cobalt, a cool blue color. It has an RGB value of 4, 33, 139 and a relative luminance of 0.030, making it a dark surface.
Temperature
❄ Cool
Hue family
blue
Luminance
0.03
Conversions
HEX
RGB
HSL
HSV
CMYK
OKLCHPro
Contrast & accessibility
On white
The quick fox
13.16:1
AA normal✓
AA large✓
AAA normal✓
On black
The quick fox
1.60:1
AA normal✕
AA large✕
AAA normal✕
Color harmonies
Complementary
Split-complementary
Shades & tints
Similar named colors
Frequently asked
What is the color #04218B?
#04218B is Cobalt, a cool blue color. In RGB it is 4, 33, 139, and in HSL it is 227°, 94%, 28%.
Is #04218B a light or dark color?
#04218B has a relative luminance of 0.030, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #04218B?
Its complementary color is #8B6D04. For softer combinations, try the analogous or split-complementary harmonies shown above.