Qsquare Global Shop & Sell, Check Reviews on Mobile. "I bought an item on impulse! Where can I sell it? ". "I have too many things piling at home! ". "Where can I get items at a bargain? ". Look no more! Qsquare is here to meet all your shopping needs! Qsquare is an app where you can sell your new, used or pre-loved items on Fleamarket, and buy items at a bargain.