See every Amazon seller's stock, before you source, price, or list.

AmzCompanion is the browser extension that overlays live seller and inventory data on any Amazon product page — so you get the answer in 2 seconds instead of 20 minutes.

Install free — Chrome or Firefox

This extension is currently supported on Chrome, Edge, and Firefox. Open Chrome Web Store

See how it works

Chrome & Firefox · 14-day trial · No credit card · Every Amazon marketplace worldwide

Built by Amazon sellers, for Amazon sellers

Private. Never touches your Seller Central

No credit card required

From listing to answer in 3 clicks.

Install the extension

One click from the Chrome Web Store or Firefox Add-ons. No account required to start.

Open any Amazon listing

Open any Amazon listing on any marketplace worldwide. AmzCompanion loads seller and stock data.

See every seller, every stock count, every split

FBA / FBM / Amazon-direct, filtered and ranked however you want.

The whole flow takes less than 30 seconds. Your 14-day trial starts the moment you pin the extension.

See what Amazon doesn't show you.

Who's selling this ASIN right now, and how much stock are they sitting on?

Every seller, counted

See each offer on an ASIN with its estimated stock.

FBA / FBM split

Instant percentage breakdown of who's Prime-eligible.

Filters that matter

Price, seller type, condition, stock, applied inline.

No dashboards

Runs on the Amazon page itself. No pasting ASINs elsewhere.

Every Amazon marketplace

Works on every Amazon storefront worldwide. Every country, every locale.

Private by default

Never reads your Seller Central. Never tracks you off Amazon.

Simple pricing. Start free.

14-day trial of every feature. No card. Cancel anytime.

Monthly

Annual

Save 30%

Solo

Perfect for independent sellers who want clear inventory insights.

/month

Seller stock breakdown per listing

Total seller count

Total combined seller stock

Advanced filters

Email support

Includes 1 seat

Start free trial

Plus

Why not Jungle Scout, Helium 10, or Keepa?

The big Amazon-seller suites are powerful, but they pull you into a separate dashboard and ask you to paste in ASINs or upload files. That's overhead you pay every single time you check a product.

AmzCompanion is the opposite shape: a focused tool that runs inline on the Amazon page itself, answers one question (who sells this and how much stock do they have?) in 2 seconds, and gets out of your way. Many of our users run it alongside the suites, not instead.

Jungle Scout

JUNGLE SCOUT

HELIUM 10

KEEPA

AmzCompanion

Runs inline on Amazon pages

Partial (sales/revenue only, no per-seller stock)

Price + BSR history only

Full seller list + stock

Shows every seller's stock

Yes (in X-Ray panel, slower load)

Yes

FBA/FBM split at a glance

Partial (collapses FBA into AMZ)

Yes

Separate dashboard required

Yes

Entry price

$$$

Comparison based on publicly available features as of 23 May 2026. Competitor entry pricing as referenced: Jungle Scout ~US$49/mo (Suite) / ~US$29/mo (Start-up); Helium 10 ~US$39/mo (Starter); Keepa ~€19/mo. AmzCompanion is not affiliated with Jungle Scout, Helium 10, or Keepa. We recommend verifying current capabilities and pricing directly with each provider.