Here You can set color in RGB color model and watch at complimentary colors at bottom of the page or just click random color.
Basic color:
#0d245c; rgb(13,36,92); hsl(222,75%,21%);
black
black
white
white
Complementary colors:
Analogous harmony (H+30):
#1e0d5e; rgb(30,13,94); hsl(252,75%,21%);
black
black
white
white
Analogous harmony (H-30):
#0d4d5e; rgb(13,77,94); hsl(192,75%,21%);
black
black
white
white
Triadic harmony (H+120):
#5e0d24; rgb(94,13,36); hsl(342,75%,21%);
black
black
white
white
Triadic harmony (H-120):
#255e0d; rgb(37,94,13); hsl(102,75%,21%);
black
black
white
white
Split complements harmony (H+150):
#5e1d0d; rgb(94,29,13); hsl(12,75%,21%);
black
black
white
white
Split complements harmony (H-150):
#4d5e0d; rgb(77,94,13); hsl(72,75%,21%);
black
black
white
white
Complement harmony (H+180):
#5e460d; rgb(94,70,13); hsl(42,75%,21%);
black
black
white
white
Monochromatic harmony (S+30):
#001f6b; rgb(0,31,107); hsl(222,100%,21%);
black
black
white
white
Monochromatic harmony (S-30):
#1d2b4e; rgb(29,43,78); hsl(222,45%,21%);
black
black
white
white
Monochromatic harmony (L+10):
#14368a; rgb(20,54,138); hsl(222,75%,31%);
black
black
white
white
Monochromatic harmony (L-10):
#071331; rgb(7,19,49); hsl(222,75%,11%);
black
black
white
white