Guides to ad research and product research
Practical guides for people who research ads, stores and products. Each one shows the steps, the filters to use and how to check the result in SellWinners.
All guides
Ad library MCP servers compared: ads and store data for AI agents
Which MCP servers let Claude, ChatGPT and other AI agents search competitor ads and Shopify stores: networks, auth, free tiers and docs, checked and dated.
How to do an e-commerce competitor analysis, with a template to copy
How to run an e-commerce competitor analysis: find your real rivals, read their stores, ads, emails and offers, then track changes with a template to copy.
How to use the Facebook Ad Library: search, filters and what it hides
How to use the Facebook Ad Library: search by keyword or advertiser, set the filters, see every ad a competitor runs, read EU reach data and what it hides.
The best Shopify spy tools, compared fact by fact
The best Shopify spy tools compared on the same facts: sales estimates, traffic, apps and themes, ads, browser extensions, API access and free plans, dated.
Best dropshipping product research tools 2026, compared
Nine dropshipping product research tools compared: where each starts, the store and sales data it shows, free plan or trial, API and MCP, sourced and dated.
An ad library API for Meta, Google and TikTok ads
Search Meta, Google and TikTok ads from your code with one API key. The endpoints, a first curl request, paging, rate limits and an MCP server for AI agents.
How to find winning products for dropshipping
Find winning dropshipping products in six steps: start from growing Shopify stores, read their best sellers, check the ads behind them, then score each idea.
How to see how much a Shopify store makes
Shopify stores do not publish their sales. Learn the ways to estimate what a store makes, how far to trust each one, and how to check a store by its domain.
The best ad spy tools, compared fact by fact
Eight ad spy tools side by side: the ad networks each one lists, store research, free plan or trial, API and MCP access, with every fact sourced and dated.
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