How it compares on seller stock.
Three tools that also show stock on Amazon listings, checked against their own pricing pages and help docs in October 2026. They do more than we do in places, and we say where.
SellerAmp SAS
from $19.95/moSellerAmp is built around profit and ROI. Its offers panel shows estimated stock per seller next to eligibility checks and Keepa charts. It runs on Chrome only, across seven storefronts.
Keepa
from €29/moMost sellers know Keepa for price history, and its charts and alerts are free. Stock levels need Keepa Pro, which collects them mostly for the top ten offers. Each subscription covers one person.
Seller Assistant
from $29.99/moSeller Assistant bundles a profit calculator, restriction checks and IP alerts with its stock checker, which counts Amazon inside FBA. It covers about as many storefronts as we do.
Swipe the table sideways to see all four tools.
| What you get | AmzCompanion | SellerAmp | Keepa | Seller Assistant |
|---|---|---|---|---|
| Stock on the listing | ||||
| Estimated stock for each seller | YesIn the panel on the product page | YesOffers panel, lowest 10 first | PartlyPro only, mostly top 10 offers | YesOffers window and side panel |
| FBA, FBM and Amazon units with shares | YesAmazon kept separate | PartlyOffer counts by type, no unit totals | PartlyOffer count history, no units | PartlyFBA and FBM units, Amazon inside FBA |
| Rating, condition and delivery date per offer | Yes | PartlyNo condition or delivery column documented | Not documentedNo rating or delivery in offer data | PartlyRating and condition, no delivery date |
| Filter offers by price range | YesPrice plus shipping | NoPrime only and Live or Recent | Not documented | NoType, condition and seller search |
| Marks counts that are a minimum | Yes1000+ and per-order caps | YesA + sign on purchase limits | Not documented | Not documented |
| Where it runs | ||||
| Amazon storefronts | 20 | 7 | 11 | 20, 8 of them partly |
| Firefox | Yes | NoChrome only | Yes | Yes |
| What they do that we don't | ||||
| Price and sales rank history | No | YesKeepa-powered charts | YesIts core product | Yes |
| Profit and ROI calculator | No | Yes | No | Yes |
| Sales estimates | No | Yes | PartlyAmazon's bought-past-month ranges | YesIn 12 storefronts |
| Eligibility and IP alerts | No | Yes | No | Yes |
| Price and trial | ||||
| Entry price for stock data | $12/mo | $19.95/mo | €29/mo (Pro) | $29.99/mo |
| Free trial without a card | Yes14 days | Partly14 days, card required | NoNo trial, free tier has no stock | Partly14 days, card required |
| More than one seat | Yes2 on Plus $18, 5 on Scale $31 | PartlyExtra users on $49.95 plan | NoOne seat per subscription | Yes2 on Pro, extra users $14.99 |
Partly means the tool does some of it, and the note says which part. Not documented means we couldn't find it in the vendor's own material, so it may still exist.
Switching, or adding it alongside.
Lots of sellers keep a sourcing tool for profit and history, and open AmzCompanion when they want to know who holds the stock.
Coming from SellerAmp
Keep SellerAmp for profit and eligibility checks. Open AmzCompanion when you need to know who holds the stock. It also runs in Firefox, and on 20 storefronts where SellerAmp covers 7.
Alongside Keepa
Keep Keepa for history, and its free charts stay free. AmzCompanion adds a stock count for each offer while you're on the listing. Plans start at $12 a month.
Coming from Seller Assistant
If the stock checker is the part you use most, AmzCompanion does that job for less. It also shows Amazon's units on their own line.
Sources.
Seller Assistant
We checked each vendor's public pages in October 2026. Prices are list prices before tax. Product names belong to their owners and none of them is affiliated with AmzCompanion. If we got something wrong, email support@amzcompanion.com and we'll fix it.
See who holds the stock on your next listing.
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