Cobalt
#1537D1 · Cobalt
#1537D1 is Cobalt, a cool blue color. It has an RGB value of 21, 55, 209 and a relative luminance of 0.075, 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
8.40:1
AA normal✓
AA large✓
AAA normal✓
On black
The quick fox
2.50:1
AA normal✕
AA large✕
AAA normal✕
Color harmonies
Complementary
Analogous
Split-complementary
Shades & tints
Similar named colors
Frequently asked
What is the color #1537D1?
#1537D1 is Cobalt, a cool blue color. In RGB it is 21, 55, 209, and in HSL it is 229°, 82%, 45%.
Is #1537D1 a light or dark color?
#1537D1 has a relative luminance of 0.075, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #1537D1?
Its complementary color is #D1AE15. For softer combinations, try the analogous or split-complementary harmonies shown above.