“Killer App” (** out of four) was a flashy but empty and obvious thriller about a young girl (Ashley Rickards) who designs an online app that matches those with their enemies. However, when many of her friends start winding up dead, she has to discover whose behind it before it’s too late. Good-looking horror thriller has very stylish lighting and cinematography and an original storyline that should have been told with more originality and creativity and thrills. Rickards is solid in the lead.