Know your real profit before you list

Sellfin turns "what will I actually clear?" into one number — instantly, for every marketplace at once — and it runs entirely on your device. Enter an item's cost, list price, shipping and supplies, and see your real net profit, margin and ROI after each marketplace's fees.

Compare the same item side by side across eBay, Etsy, Poshmark, Mercari, Depop and more, ranked by payout with the best one highlighted. Or work backwards: tell Sellfin the profit, margin or ROI you want and it gives you the list price to set on every marketplace.

Every fee is yours to adjust — final value percentages, listing and per-order fees, payment processing and flat-fee rules — so the math stays accurate as marketplaces change. Save items to the inventory tracker, mark them unlisted, listed or sold, and watch invested capital, realized vs projected profit, average margin and days-to-sell.

Spreadsheets break past a couple hundred items and platform dashboards don't know what your stock cost you. Sellfin keeps the math honest and the data yours: light and dark themes, a quick-check popup, a full dashboard, keyboard shortcuts, and JSON/CSV backup — with not a single number sent to a server.