Cobalt
#304BB5 · Cobalt
#304BB5 is Cobalt, a cool blue color. It has an RGB value of 48, 75, 181 and a relative luminance of 0.090, making it a dark surface.
Temperature
❄ Cool
Hue family
blue
Luminance
0.09
Conversions
HEX
RGB
HSL
HSV
CMYK
OKLCHPro
Contrast & accessibility
On white
The quick fox
7.50:1
AA normal✓
AA large✓
AAA normal✓
On black
The quick fox
2.80:1
AA normal✕
AA large✕
AAA normal✕
Color harmonies
Complementary
Split-complementary
Shades & tints
Similar named colors
Frequently asked
What is the color #304BB5?
#304BB5 is Cobalt, a cool blue color. In RGB it is 48, 75, 181, and in HSL it is 228°, 58%, 45%.
Is #304BB5 a light or dark color?
#304BB5 has a relative luminance of 0.090, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #304BB5?
Its complementary color is #B59B30. For softer combinations, try the analogous or split-complementary harmonies shown above.