Cobalt
#045BB9 · Cobalt
#045BB9 is Cobalt, a cool blue color. It has an RGB value of 4, 91, 185 and a relative luminance of 0.110, making it a dark surface.
Temperature
❄ Cool
Hue family
blue
Luminance
0.11
Conversions
HEX
RGB
HSL
HSV
CMYK
OKLCHPro
Contrast & accessibility
On white
The quick fox
6.56:1
AA normal✓
AA large✓
AAA normal✕
On black
The quick fox
3.20:1
AA normal✕
AA large✓
AAA normal✕
Color harmonies
Complementary
Split-complementary
Shades & tints
Similar named colors
Frequently asked
What is the color #045BB9?
#045BB9 is Cobalt, a cool blue color. In RGB it is 4, 91, 185, and in HSL it is 211°, 96%, 37%.
Is #045BB9 a light or dark color?
#045BB9 has a relative luminance of 0.110, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #045BB9?
Its complementary color is #B96104. For softer combinations, try the analogous or split-complementary harmonies shown above.