Home / Compare / Amazon Arbitrage & FBA Tools
Short answer:
| InventoryLab | Keepa | |
|---|---|---|
| Pricing | Included in Threecolts Seller 365 from $69/mo (no standalone plan) | Free extension; data subscription €29/mo or €290/yr |
| Free option | Free trial | Yes |
| Works with | Amazon | Amazon (all marketplaces) |
| Best for | FBA sellers who need listing, prep and accounting in one | Anyone buying or selling on Amazon |
| Strengths | + Accurate FBA profit tracking + Streamlined shipment workflow + Includes Scoutify | + Essential price and rank history + Free basic charts + Powerful product finder on paid plan |
| Weaknesses | - Amazon-only - Monthly cost | - Steep learning curve - Advanced data requires subscription |
| Visit InventoryLab | Visit Keepa |
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.
Keepa tracks Amazon price and sales rank history for millions of products and displays charts right on Amazon product pages. Arbitrage sellers use it to see whether a price is stable, how often the item sells, and whether Amazon itself is on the listing.
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 InventoryLab: accurate fba profit tracking; for Keepa: essential price and rank history) weighed against its main drawback (amazon-only versus steep learning curve).
Still undecided? See InventoryLab alternatives or Keepa 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.
Checked 2026-10-17. Confirm current pricing on each site.