Workflow & Planning
See what inventory is really available on Amazon — by seller, by region, by day.
Compare extensions
Workflow & Planning
Free keyword ranking & index check tool by SellerApp - The most accurate seller tool for all amazon market places.
Audience & ratings
Store users
10K
10K
Ratings
What stands out
Both listings report the same store-user count. The rating difference is 0.74 points across 56 and 48 ratings.
Category overlap does not establish that two products serve the same workflow.
Product & publisher
Publisher
how many extension
SellerApp
Publisher portfolio
1 listing
5 listings
Listing status
Active
Active
Manifest
Version 3
Version 3
Package size
925KiB
248KiB
Permissions & access
Requested capabilities describe access, not developer intent or a safety verdict.
API permissions
3 requested
- webRequest
- activeTab
- storage
1 requested
- storage
Website patterns
15 recorded
- *://app.howmanyextension.com/*
- https://api-v2.howmanyextension.com/*
- https://*.amazon.com/*
- 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/*
- https://*.amazon.ca/*
- https://*.amazon.com.br/*
- https://*.amazon.com.au/*
3 recorded
- https://*/sellercentral.amazon.*/
- https://*/amazon.*/
- https://*/sellerapp.*/
Releases
Explore the release history
Create an account to compare versions and update timing. Your plan controls history depth.
Create your free accountEvidence behind this comparison
Both listings observed 2 Oct 2026.
Store users and ratings are observations, not revenue or lifetime installs. A larger audience or a higher score does not establish product quality.
How Earlygap collects evidenceReplace an extension
Your comparison
2 of 2 selected
How Many? – Amazon Inventory CheckerWorkflow & Planning
Amazon Index CheckerWorkflow & Planning