Home / Compare / Amazon Arbitrage & FBA Tools
Short answer:
| Amazon Seller App | InventoryLab | |
|---|---|---|
| Pricing | Free (seller plan from $39.99/mo for Professional) | Included in Threecolts Seller 365 from $69/mo (no standalone plan) |
| Free option | Yes | Free trial |
| Works with | Amazon | Amazon |
| Best for | Checking eligibility and fees in-store | FBA sellers who need listing, prep and accounting in one |
| Strengths | + Free and official + Shows eligibility restrictions + Fee estimates | + Accurate FBA profit tracking + Streamlined shipment workflow + Includes Scoutify |
| Weaknesses | - Limited historical data - Requires a seller account | - Amazon-only - Monthly cost |
| Visit Amazon Seller App | Visit InventoryLab |
Amazon's own Seller app lets you scan barcodes to check whether you are allowed to sell an item, estimated fees and current offers. It is the first tool every new Amazon reseller should install.
InventoryLab handles FBA shipment creation, cost tracking and profit reporting, and includes the Scoutify 2 scanning app. It is now sold only as part of the Threecolts Seller 365 bundle. It is popular with retail arbitrage and wholesale sellers who want accurate profit numbers.
Retail and online arbitrage on Amazon live and die by data: sales rank, price history, Buy Box competition, fees and ungating restrictions. These tools range from free browser extensions to full research suites. Beginners usually start with one scanner app plus Keepa, and add a sourcing suite once they are consistently profitable. The deciding factors usually come down to each tool's standout strength (for Amazon Seller App: free and official; for InventoryLab: accurate fba profit tracking) weighed against its main drawback (limited historical data versus amazon-only).
Still undecided? See Amazon Seller App alternatives or InventoryLab alternatives.
Flip Profit Calculator ($12)
Spreadsheet that returns net proceeds, max buy price, ROI and a GO / COUNTER / PASS decision with fees for 10 platforms, plus a 500-row flip log and dashboard.
Marketplace Pricing Cheat Sheet ($7)
Fees for 8 resale platforms, max-buy and ROI formulas, comp check, net payout table and shipping reference on 6 printable pages.
Instant digital downloads sold via Gumroad.
Reach resellers actively choosing tools in Amazon Arbitrage & FBA Tools.
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Checked 2026-10-17. Confirm current pricing on each site.