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How Many? – Amazon Inventory Checker

Chrome extension by how many extension · Productivity · Workflow

  • Trader

A Chrome extension in Productivity · Workflow with 10 000 users, an established extension.

Specific sites only: 15 match patterns.

What the developer says, and 5 screenshots

Loading from the Chrome Web Store. Open the listing if it does not appear.

Users
10 000
Rating
3.4 (56 ratings)
Users, last 15 days
unchanged
Rating, last 30 days
Not watched long enough to say
Version
6.3.6
Updated in the store
2026-09-11
Published
2016-01-16
Manifest
V3
Browser access
3 permissions, 15 site patterns

How it has moved

Users
unchanged since 01.09
10k · 2 readings
2026-09-07: released 6.3.22026-09-10: released 6.3.52026-09-11: released 6.3.6
  1. 2026-09-0110k
  2. 2026-09-1510k
Rating
unchanged since 01.09
reviewsrating 3.43 · 2 readings
2026-09-07: released 6.3.22026-09-10: released 6.3.52026-09-11: released 6.3.6
  1. 2026-09-01reviews56rating3.43
  2. 2026-09-15reviews56rating3.43
Users
unchanged since 01.09
10k · 2 readings
2026-09-07: released 6.3.22026-09-10: released 6.3.52026-09-11: released 6.3.6
  1. 2026-09-0110k
  2. 2026-09-1510k
Rating
unchanged since 01.09
reviewsrating 3.43 · 2 readings
2026-09-07: released 6.3.22026-09-10: released 6.3.52026-09-11: released 6.3.6
  1. 2026-09-01reviews56rating3.43
  2. 2026-09-15reviews56rating3.43

A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing more than once a day and record a point only when something moves. History beyond ninety days is in the app.

What it can reach

Specific sites only: 15 match patterns.

  • *://app.howmanyextension.com/*
  • https://api-v2.howmanyextension.com/*
  • https://*.amazon.com/*
Show the remaining 9
  • https://*.amazon.co.uk/*
  • https://*.amazon.es/*
  • https://*.amazon.nl/*
  • https://*.amazon.com.mx/*
  • https://*.amazon.it/*
  • https://*.amazon.in/*
  • https://*.amazon.de/*
  • https://*.amazon.fr/*
  • https://*.amazon.cn/*
  • Watch the network requests your browser makes webRequest
  • Act on the current tab, but only after you click it activeTab
  • Store data in your browser storage

The full permission history for this extension

Version history

  1. Version 6.3.6
  2. Version 6.3.5
  3. Version 6.3.2

What changed recently

  1. Package size changed
  2. Released version 6.3.6 (was 6.3.5)
  3. Package size changed
Show the remaining 3
  1. Released version 6.3.5 (was 6.3.2)
  2. Package size changed
  3. Released version 6.3.2 (was 6.3.1)

The publisher

how many extension. Listed website: howmanyextension.com.

Like this one

Listings the catalog judges closest in what they say they do.

  1. SellerBot StockSpy - Free Amazon Inventory Checker Describes nearly the same job, smaller audience 292 users ★ 5.0
  2. AmzCompanion — Amazon Stock Checker for Sellers Describes nearly the same job, smaller audience 14 users
  3. Check Competitor Stock Levels - Inventory Spy Describes nearly the same job, smaller audience 7k users ★ 3.3
  4. Online Seller Addon Describes nearly the same job, with an established audience 70k users ★ 3.7
  5. AMZScout Stock Stats - Amazon Stock Level Spy Describes nearly the same job, with an established audience 30k users ★ 3.8

The top 5 only. The full comparison, with why each one is close, is on the alternatives page; ranking a whole neighbourhood by your own criteria is in the app.

Is this your extension?

Connect it to Ext Ops Panel and see installs, uninstalls and uninstall reasons as events arrive, not as a weekly summary.

See what the panel does

Figures come from our own daily pass over the public Chrome Web Store listing, last read on . We publish no contact details for extension developers.