Profit calculator, 90-day price history, listing SEO scorer, and competitor monitoring — all in a single Chrome extension. Used by thousands of UK eBay sellers.
Five tools that actually move the needle for serious eBay sellers.
Real-time profit, margin, ROI, and break-even calculation on every eBay listing. Full UK fee engine — FVF by category, managed payments, store discounts, Top Rated Seller 10% discount. No spreadsheet needed.
FREESee what items actually sell for — not just what sellers are asking. Powered by the official eBay API. Averages, min/max, trend chart, and individual sale details. Know your market before you list.
FREE · 30 days PRO · 90 days + chartEvery listing in your eBay search gets a live profit badge. Green = profitable, amber = marginal, red = loss. Spot the flips worth pursuing without clicking into every listing.
FREEScore your own listings out of 100 — title quality, description, image count, pricing strategy. Get specific, actionable suggestions to improve your search ranking and conversion rate.
PROMonitor up to 50 competitor sellers or listings. Daily background checks detect price changes and new listings. Alerts appear in your dashboard the next time you open VaultSeller.
PRO · Up to 50Injects a "VS Profit" column directly into your eBay Seller Hub active listings table — see estimated net profit and effective fee rate for every item without opening each listing individually.
FREE · 10 rows PRO · All rowsVaultSeller's profit calculator auto-detects eBay fees for the current category, pre-fills the selling price from the listing, and gives you live profit/margin/ROI as you type. No more mental maths or spreadsheets.
It even calculates your break-even price — so you know the minimum you can list for without losing money, even after eBay takes their cut.
Start free. Upgrade when you're ready.
Free forever for core features. Upgrade to Pro when you're ready.
🧩 Add to Chrome — Free