Cobalt
#3F507D · Cobalt
#3F507D is Cobalt, a cool blue color. It has an RGB value of 63, 80, 125 and a relative luminance of 0.083, making it a dark surface.
Temperature
❄ Cool
Hue family
blue
Luminance
0.08
Conversions
HEX
RGB
HSL
HSV
CMYK
OKLCHPro
Contrast & accessibility
On white
The quick fox
7.91:1
AA normal✓
AA large✓
AAA normal✓
On black
The quick fox
2.65:1
AA normal✕
AA large✕
AAA normal✕
Color harmonies
Complementary
Split-complementary
Shades & tints
Similar named colors
Frequently asked
What is the color #3F507D?
#3F507D is Cobalt, a cool blue color. In RGB it is 63, 80, 125, and in HSL it is 224°, 33%, 37%.
Is #3F507D a light or dark color?
#3F507D has a relative luminance of 0.083, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #3F507D?
Its complementary color is #7D6D3F. For softer combinations, try the analogous or split-complementary harmonies shown above.