Cobalt
#02378D · Cobalt
#02378D is Cobalt, a cool blue color. It has an RGB value of 2, 55, 141 and a relative luminance of 0.047, making it a dark surface.
Temperature
❄ Cool
Hue family
blue
Luminance
0.05
Conversions
HEX
RGB
HSL
HSV
CMYK
OKLCHPro
Contrast & accessibility
On white
The quick fox
10.86:1
AA normal✓
AA large✓
AAA normal✓
On black
The quick fox
1.93:1
AA normal✕
AA large✕
AAA normal✕
Color harmonies
Complementary
Split-complementary
Shades & tints
Similar named colors
Frequently asked
What is the color #02378D?
#02378D is Cobalt, a cool blue color. In RGB it is 2, 55, 141, and in HSL it is 217°, 97%, 28%.
Is #02378D a light or dark color?
#02378D has a relative luminance of 0.047, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #02378D?
Its complementary color is #8D5802. For softer combinations, try the analogous or split-complementary harmonies shown above.