PageDiff

PageDiff is a service that monitors public web pages for changes. Users describe what to watch using plain English rather than selectors or code, and it delivers AI-generated summaries of detected changes along with an assessment of their significance.

The process begins by entering any URL to obtain a live snapshot. Users then specify watch conditions in everyday language, such as noting when pricing or headlines change, or opt to track the entire page. On a user-defined schedule, the service performs comparisons using text, visual, and HTML methods to identify alterations. It generates plain-language explanations of what changed and why it matters, filtering out insignificant updates such as reordered footers through a significance score.

Alerts reach users through email, Slack, Discord, or signed webhooks. Recipients can include additional CC addresses, and a significance threshold can be set to reduce unnecessary notifications. The service supports monitoring of competitor and product pages among other public content.

PageDiff is delivered as a web-based tool with a desktop preview available without signup or payment. It functions as an AI-assisted web page monitoring service focused on natural-language instructions and summarized change detection.