Free stock counter for Amazon sellers with unlimited daily product checks. This extension will show the inventory counts for the different offers on an Amazon listing. You do not need to create an account or signup for anything. You can add the extension and start using it immediately. Works for all Amazon domains. How to use the Amazon stock checker: Add the extension to your browser (click the Add to Chrome button in the top right and confirm) Visit a product detail page on Amazon.com, and click the "Count Stock!" button or click the OS Addon icon in the top right of your browser.