Tints
#ff0000
#ff1919
#ff3232
#ff4c4c
#ff6666
#ff7f7f
#ff9999
#ffb2b2
#ffcccc
#ffe5e5
#ffffff
Triadic
#ff0000
#00ff00
#0000ff
Monochromatic
#b30000
#cc0000
#e60000
#ff0000
#ff1a1a
#ff3333
#ff4d4d
Analogous
#ff0000
#ff8000
#ff0080
Red Complementary Colors
#ff0000
#00ffff

Related: Red Gradients, All Red Colors