Cobalt
#3F487D · Cobalt
#3F487D is Cobalt, a cool blue color. It has an RGB value of 63, 72, 125 and a relative luminance of 0.072, making it a dark surface.
Temperature
❄ Cool
Hue family
blue
Luminance
0.07
Conversions
HEX
RGB
HSL
HSV
CMYK
OKLCHPro
Contrast & accessibility
On white
The quick fox
8.63:1
AA normal✓
AA large✓
AAA normal✓
On black
The quick fox
2.43:1
AA normal✕
AA large✕
AAA normal✕
Color harmonies
Complementary
Split-complementary
Shades & tints
Similar named colors
Frequently asked
What is the color #3F487D?
#3F487D is Cobalt, a cool blue color. In RGB it is 63, 72, 125, and in HSL it is 231°, 33%, 37%.
Is #3F487D a light or dark color?
#3F487D has a relative luminance of 0.072, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #3F487D?
Its complementary color is #7D743F. For softer combinations, try the analogous or split-complementary harmonies shown above.