Cobalt
#3A21C4 · Cobalt
#3A21C4 is Cobalt, a cool blue color. It has an RGB value of 58, 33, 196 and a relative luminance of 0.060, making it a dark surface.
Temperature
❄ Cool
Hue family
blue
Luminance
0.06
Conversions
HEX
RGB
HSL
HSV
CMYK
OKLCHPro
Contrast & accessibility
On white
The quick fox
9.57:1
AA normal✓
AA large✓
AAA normal✓
On black
The quick fox
2.19:1
AA normal✕
AA large✕
AAA normal✕
Color harmonies
Complementary
Split-complementary
Shades & tints
Similar named colors
Frequently asked
What is the color #3A21C4?
#3A21C4 is Cobalt, a cool blue color. In RGB it is 58, 33, 196, and in HSL it is 249°, 71%, 45%.
Is #3A21C4 a light or dark color?
#3A21C4 has a relative luminance of 0.060, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #3A21C4?
Its complementary color is #ACC421. For softer combinations, try the analogous or split-complementary harmonies shown above.