The 7UP competitor crossword solutions are SPRITE (6 letters) and SLICE (5 letters). SPRITE is a lemon-lime flavored soft drink created by the Coca-Cola Company. It was first introduced in 1961 and has become one of the most popular soft drinks in the world. SLICE is a fruit-flavored soft drink created by PepsiCo in 1984. It is available in many different flavors, including orange, grape, and strawberry. Both SPRITE and SLICE are popular alternatives to 7UP.