Cobalt
#0A21B2 · Cobalt
#0A21B2 is Cobalt, a cool blue color. It has an RGB value of 10, 33, 178 and a relative luminance of 0.044, 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
11.21:1
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 #0A21B2?
#0A21B2 is Cobalt, a cool blue color. In RGB it is 10, 33, 178, and in HSL it is 232°, 89%, 37%.
Is #0A21B2 a light or dark color?
#0A21B2 has a relative luminance of 0.044, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #0A21B2?
Its complementary color is #B29C0A. For softer combinations, try the analogous or split-complementary harmonies shown above.