New Amazon sellers burn money on suites they do not need. Here is the minimum stack, in the order you will need it.
| # | Tool | Price (checked Oct 2026) | Why it is here |
|---|---|---|---|
| 1 | Amazon Seller App | Free (seller plan from $39.99/mo for Professional) | Free scanning, eligibility and fee preview. |
| 2 | Keepa | Free extension; data subscription €29/mo or €290/yr | Price and rank history; the free extension already helps, paid data is €29/mo. |
| 3 | SellerAmp SAS | $19.95/mo (Getting Started), $29.95, $49.95 (Going Pro) | Profit and ROI per product from $19.95/mo with a 14-day trial. |
| 4 | InventoryLab | Included in Threecolts Seller 365 from $69/mo (no standalone plan) | Shipment creation and profit reporting, now inside Threecolts Seller 365 from $69/mo. |
Free scanning, eligibility and fee preview.
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.
Pros: Free and official; Shows eligibility restrictions; Fee estimates. Cons: Limited historical data; Requires a seller account.
Price and rank history; the free extension already helps, paid data is €29/mo.
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.
Pros: Essential price and rank history; Free basic charts; Powerful product finder on paid plan. Cons: Steep learning curve; Advanced data requires subscription.
Profit and ROI per product from $19.95/mo with a 14-day trial.
SellerAmp SAS (Selling Assistant) is a browser extension and mobile app that calculates profit, ROI, eligibility, Buy Box share and alerts for any Amazon product, using your own fees and buy cost. It is the most popular deal-analysis tool among arbitrage sellers.
Pros: Fast profit and ROI calculations; Eligibility and IP alerts; Works in-store on mobile. Cons: Arbitrage-specific; Monthly subscription.
Shipment creation and profit reporting, now inside Threecolts Seller 365 from $69/mo.
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.
Pros: Accurate FBA profit tracking; Streamlined shipment workflow; Includes Scoutify. Cons: Amazon-only; Monthly cost.
You can run retail arbitrage on the free Seller app plus Keepa's free charts for your first month, then add SellerAmp.
The Professional selling plan is $39.99/mo plus per-item fees; tools add $0-$70/mo for a lean stack.
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.
Fees and prices were checked on October 17, 2026 and change often. Always confirm on the platform's own fee page.