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A Wappalyzer alternative that searches the code

Wappalyzer is known for its browser extension that shows the technologies on the page you're looking at, plus lookups and lists. StackGrep searches the HTML of websites directly, so you can find sites by anything in their code, then turn them into lists and alerts.

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What StackGrep does differently

  • Go the other way round: start from a tool or a snippet and find every site that has it.
  • Search the raw HTML, so you're not limited to what a detector recognises.
  • Boolean stack filters (shopify AND klaviyo AND NOT attentive) with country filters.
  • An API and an MCP server for AI agents, with unlimited seats on paid plans.

When Wappalyzer may suit you better

If you mainly want to check the stack of the site you're on, right in your browser. We haven't tested everything Wappalyzer offers, so check their site for what they do today.

Questions

Is StackGrep a Wappalyzer alternative?

If you want lists of sites by technology, yes. Wappalyzer is great for looking up the site in front of you; StackGrep is built for searching across all of them.

Does StackGrep have a browser extension?

Not yet. You can look up any site's technologies and search across every site from the website, the API or an AI agent.

Want the whole list?

Sign up free to download every site you find, and get a heads-up when new ones appear. 500 free credits a month, no card needed.

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