Clusters
A cluster is a set of unique domain names, saved under your account. It is what turns a search - which answers a question once, right now - into something you can keep, compare against next month's answer, combine with another, and read fields out of.
Clusters are for signed-in accounts. What one may hold depends on the plan; see limits. The same clusters can be managed from code through the API, and by an AI assistant through the MCP tools.
What they are for
Keep
Store what a query returned. The index moves on and a search cannot be re-run against how it used to be.
Compare
Subtract one cluster from another to see who adopted a signature since last time, and who dropped it.
Combine
AND, OR and subtraction between clusters, saved as a new one.
Extract
Pull phone numbers, accounts or addresses off every site in the set, internal pages included.
Filter
Upload your own list of domains and use it to narrow search results to it - or to everything but it.
Download
Browse page by page, or take the whole thing as a file.
In detail
- Creating a cluster - from search results, from a file, or from other clusters.
- Extraction - reading fields off the sites in a cluster.
- Limits - how many, how large, and how extraction is counted.
Worked examples
- Tracking a widget change - which sites replaced one share widget with another, using two clusters and a subtraction across a PublicWWW update.
- Extracting phones and emails - from two searches to a spreadsheet of contact details for Greek WordPress sites.