Cobalt
#05178A · Cobalt
#05178A is Cobalt, a cool blue color. It has an RGB value of 5, 23, 138 and a relative luminance of 0.025, making it a dark surface.
Temperature
❄ Cool
Hue family
blue
Luminance
0.02
Conversions
HEX
RGB
HSL
HSV
CMYK
OKLCHPro
Contrast & accessibility
On white
The quick fox
14.04:1
AA normal✓
AA large✓
AAA normal✓
On black
The quick fox
1.50:1
AA normal✕
AA large✕
AAA normal✕
Color harmonies
Complementary
Split-complementary
Shades & tints
Similar named colors
Frequently asked
What is the color #05178A?
#05178A is Cobalt, a cool blue color. In RGB it is 5, 23, 138, and in HSL it is 232°, 93%, 28%.
Is #05178A a light or dark color?
#05178A has a relative luminance of 0.025, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #05178A?
Its complementary color is #8A7805. For softer combinations, try the analogous or split-complementary harmonies shown above.