USED - 중고책 중고서적 CD 비교 판매 is a free Android application developed to help users compare and sell second-hand books, CDs, and other related products. With this application, users can easily scan the barcode of a product and instantly see the purchase price on popular used book websites such as Yes24 and Aladin.

The platform offers an automatic calculation of the optimal selling price, providing suggestions on where and how to sell the product for the highest profit. Additionally, once the user has scanned and searched for a product, they can easily register it on the website without having to scan it again. Overall, USED - 중고책 중고서적 CD 비교 판매 is a comprehensive platform that streamlines the process of selling second-hand products, making it easier and more efficient for users to get the best value for their items.