Cobalt
#00308F · Cobalt
#00308F is Cobalt, a cool blue color. It has an RGB value of 0, 48, 143 and a relative luminance of 0.041, making it a dark surface.
Temperature
❄ Cool
Hue family
blue
Luminance
0.04
Conversions
HEX
RGB
HSL
HSV
CMYK
OKLCHPro
Contrast & accessibility
On white
The quick fox
11.54:1
AA normal✓
AA large✓
AAA normal✓
On black
The quick fox
1.82:1
AA normal✕
AA large✕
AAA normal✕
Color harmonies
Complementary
Split-complementary
Shades & tints
Similar named colors
Frequently asked
What is the color #00308F?
#00308F is Cobalt, a cool blue color. In RGB it is 0, 48, 143, and in HSL it is 220°, 100%, 28%.
Is #00308F a light or dark color?
#00308F has a relative luminance of 0.041, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #00308F?
Its complementary color is #8F5F00. For softer combinations, try the analogous or split-complementary harmonies shown above.