Sky
#51A9F5 · Sky
#51A9F5 is Sky, a cool blue color. It has an RGB value of 81, 169, 245 and a relative luminance of 0.367, making it a dark surface.
Temperature
❄ Cool
Hue family
blue
Luminance
0.37
Conversions
HEX
RGB
HSL
HSV
CMYK
OKLCHPro
Contrast & accessibility
On white
The quick fox
2.52:1
AA normal✕
AA large✕
AAA normal✕
On black
The quick fox
8.34:1
AA normal✓
AA large✓
AAA normal✓
Color harmonies
Complementary
Analogous
Split-complementary
Shades & tints
Similar named colors
Frequently asked
What is the color #51A9F5?
#51A9F5 is Sky, a cool blue color. In RGB it is 81, 169, 245, and in HSL it is 208°, 89%, 64%.
Is #51A9F5 a light or dark color?
#51A9F5 has a relative luminance of 0.367, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #51A9F5?
Its complementary color is #F59E51. For softer combinations, try the analogous or split-complementary harmonies shown above.