Cobalt
#155EA8 · Cobalt
#155EA8 is Cobalt, a cool blue color. It has an RGB value of 21, 94, 168 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
6.57:1
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 #155EA8?
#155EA8 is Cobalt, a cool blue color. In RGB it is 21, 94, 168, and in HSL it is 210°, 78%, 37%.
Is #155EA8 a light or dark color?
#155EA8 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 #155EA8?
Its complementary color is #A85E15. For softer combinations, try the analogous or split-complementary harmonies shown above.