Cobalt
#0B21B1 · Cobalt
#0B21B1 is Cobalt, a cool blue color. It has an RGB value of 11, 33, 177 and a relative luminance of 0.043, 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
11.25:1
AA normal✓
AA large✓
AAA normal✓
On black
The quick fox
1.87:1
AA normal✕
AA large✕
AAA normal✕
Color harmonies
Complementary
Split-complementary
Shades & tints
Similar named colors
Frequently asked
What is the color #0B21B1?
#0B21B1 is Cobalt, a cool blue color. In RGB it is 11, 33, 177, and in HSL it is 232°, 88%, 37%.
Is #0B21B1 a light or dark color?
#0B21B1 has a relative luminance of 0.043, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #0B21B1?
Its complementary color is #B19B0B. For softer combinations, try the analogous or split-complementary harmonies shown above.