Gridwinner analyzes wholesale and arbitrage supplier lists for Amazon FBA sellers. Upload up to 100,000 rows and see estimated FBA fees, landed cost, and ROI on every product. Files are parsed in your browser, so your supplier list never leaves your computer.
| Product | Grade | Cost | Net Profit | ROI | Rank | Sellers | Trend |
|---|---|---|---|---|---|---|---|
| A | $14.50 | +$8.42 | 58% | #3,214 ↓ | 6 / 4 | 94 | |
| A | $9.20 | +$3.85 | 42% | #412 ↓ | 8 / 2 | 88 | |
| B | $22.00 | +$6.18 | 28% | #1,082 ↑ | 11 / 9 | 71 | |
| A | $12.40 | +$11.96 | 96% | #8,540 ↓ | 3 / 7 | 91 | |
| B | $4.30 | +$1.74 | 40% | #218 ↓ | 9 / 3 | 82 | |
| C | $16.80 | −$1.20 | −7% | #2,418 | 22 / 4 | 52 |
Upload your supplier list and Gridwinner analyzes Amazon sales rank, FBA fees, ROI, and sellability risk in one view. No more juggling spreadsheets across tabs.
Your supplier data never leaves your browser. Everything is processed on your own machine, with zero cloud uploads.
Virtualized tables keep scrolling at 60fps. No lag, no crashes, no waiting on huge supplier lists.
Target ROI, max buy cost, and a true landed-cost breakdown per product so you know exactly what to pay.
Thousands of rows, VLOOKUP formulas that break, fee math that never reconciles, and a sheet that freezes the moment you scroll. Excel stops working long before your supplier list does.
From upload to ranked winners in seconds, all processed in your browser.
Drag and drop your supplier CSV or Excel file. We auto-detect columns.
The engine calculates FBA fees, true landed cost, ROI, and an A–D lead grade for every row.
Filter to green lights, export your winners, and start sourcing.
Or press ⌘O to browse. Up to 100,000 rows, parsed locally in your browser.
Gridwinner scores your entire file and surfaces the most profitable leads. Free shows you the top handful — Pro unlocks all of them, plus exports and unlimited scans. Find one winning product and Pro has already paid for itself.
The rest of your winners stay locked.
Try free — no sign-upOne profitable product pays for itself.
Yes. Gridwinner parses your supplier files entirely in your browser using Web Workers, and they are never uploaded to our servers. Your sourcing list stays on your own machine.
No. Upload a CSV, XLSX, or TSV file and the parser reads it directly. There are no API keys or third-party logins to set up.
Standard .csv, .xlsx, and .tsv files. The parser auto-detects your ASIN, price, cost, and title columns, so there is no manual column mapping.
The True Cost ledger applies current Amazon category referral rates and size-tier FBA fulfillment fees, and lets you add your own prep and inbound shipping costs for an accurate net margin.
Yes. Pro is month-to-month with no long-term contract. Upgrade, downgrade, or cancel at any time from your dashboard.
Find one profitable product and a month of Pro pays for itself. No sign-up required to try.
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