Most resale-pricing apps stop at "here's a rough number." Flip goes further: it searches live listings across 13 UK marketplaces (not just eBay, Vinted, Depop — also StockX, Vestiaire Collective, CeX, and more), tells you which platform will actually pay best for this specific item, writes your listing for you, and alerts you when the market hits your target price. One photo gets you a full answer — what it's worth, where to sell it, and when — not just a price.