Cobalt
#042EB9 · Cobalt
#042EB9 is Cobalt, a cool blue color. It has an RGB value of 4, 46, 185 and a relative luminance of 0.055, making it a dark surface.
Temperature
❄ Cool
Hue family
blue
Luminance
0.05
Conversions
HEX
RGB
HSL
HSV
CMYK
OKLCHPro
Contrast & accessibility
On white
The quick fox
10.02:1
AA normal✓
AA large✓
AAA normal✓
On black
The quick fox
2.10:1
AA normal✕
AA large✕
AAA normal✕
Color harmonies
Complementary
Split-complementary
Shades & tints
Similar named colors
Frequently asked
What is the color #042EB9?
#042EB9 is Cobalt, a cool blue color. In RGB it is 4, 46, 185, and in HSL it is 226°, 96%, 37%.
Is #042EB9 a light or dark color?
#042EB9 has a relative luminance of 0.055, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #042EB9?
Its complementary color is #B98F04. For softer combinations, try the analogous or split-complementary harmonies shown above.