The profit spreadsheet resellers keep buying, free and private: log what you paid and what it sold for, and see real per-item profit, margins, days-to-sell and totals. Works for Vinted, Depop, eBay, car boots — anywhere. No signup, no upload: your data is saved in your own browser only (and you can export CSV any time).
Everything on this page lives in your browser's local storage — clear your browser data and it's gone, so export a CSV backup now and then. Nothing is ever sent to us.
Worth knowing: if your total sales cross £1,000 in a tax year, you may need to tell HMRC about trading income — see the official guidance on gov.uk. That's general information, not tax advice; this tool's numbers can help you check where you stand.