Crossword clues for the word: KILLERAPP The word KILLERAPP has appeared as an answer to at least 6 crossword clues on different crossword puzzles. Crossword clues for KILLERAPP Showing 1 to 6 of 6 results Clue(s) “The mozzarella sticks are to die for!” "Best-selling program, in tech lingo" "Super-successful program, in high-tech slang" Game that sells consoles, say Program that tops the rest Very popular download