Free Tool to research on Competitor Best Selling Products (Shopify) - MakerHai

The stock information from where? Shopify cannot possibly have an API that allows you to access the inventory levels of everyone's website. Even if they did, many websites don't track inventory at all.

It's certainly not the most reliable indicator for what has actually sold. We place all of our products at 9999 stock and take them to zero instantly when the supplier sells out. We're dropshipping, so there is no way to tell the inventory of the supplier until suddenly they are out of stock.

Your program would make it look like we sold 9999 of each product when we took them instantly to zero but we might have only really sold 3 when the supplier ran out of stock. Of course, we do not display inventory on our sites so again, I have to ask how you could ever know what even our fake stock levels are without accessing the back end of the website.

Sorry, but it just makes no sense. The only way your app could work is if people knowingly installed it on their Shopify websites and even then, it would only have the very limited data from the few places that did (and again, as explained above, that data may not be remotely accurate as to real inventory levels). Who in their right mind would install an app that allows people to spy on their inventory and sell that information to other people? Unless, of course, you are presenting the app as something entirely different that people are installing (a free newsletter app, for instance) but then selling the information it obtains through permissions as something else to others.