Astropad mirrors your Mac - turning your iPad into a drawing tablet with pressure sensitivity. Astropad is intended for artists and creative professionals.
Luna Display extends your Mac desktop - turning your iPad into a second display for your Mac. Luna is intended for everyone who would benefit from having a second screen.
Luna + Astropad turns your iPad into a second display which also has drawing tablet capabilities. Luna allows Astropad to fully control a second display bringing Astropad drawing experience to the next level