Indigo
#155AD1 · Indigo
#155AD1 is Indigo, a cool blue color. It has an RGB value of 21, 90, 209 and a relative luminance of 0.121, making it a dark surface.
Temperature
❄ Cool
Hue family
blue
Luminance
0.12
Conversions
HEX
RGB
HSL
HSV
CMYK
OKLCHPro
Contrast & accessibility
On white
The quick fox
6.15:1
AA normal✓
AA large✓
AAA normal✕
On black
The quick fox
3.42:1
AA normal✕
AA large✓
AAA normal✕
Color harmonies
Complementary
Split-complementary
Shades & tints
Similar named colors
Frequently asked
What is the color #155AD1?
#155AD1 is Indigo, a cool blue color. In RGB it is 21, 90, 209, and in HSL it is 218°, 82%, 45%.
Is #155AD1 a light or dark color?
#155AD1 has a relative luminance of 0.121, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #155AD1?
Its complementary color is #D18C15. For softer combinations, try the analogous or split-complementary harmonies shown above.