Website Change Detection

What is website change detection?

Website change detection means automatically checking a web page on a schedule and telling you when its content changes. People use it to watch prices, stock levels and news pages. It can also watch legal pages, such as a vendor's terms of service.

The method is simple: save a copy of the page, check it again later, compare the two, and alert you if they differ. Some browsers now include a basic version. Apple added a Notify Me feature to Safari in iOS 27 that checks a site at an interval you set for something you describe, though Apple notes it needs Apple Intelligence, which "is not available in all languages or regions."

Generic tools and legal monitoring compared

Generic page-change tools and legal monitoring tools both detect change. They differ in what they do next.

Where generic tools are better:

• They work on any page, not just legal ones, so one tool can watch prices, product pages and policies.
• You control exactly which page and which part of it is watched.
• They can be cheap, and some come built into a browser at no extra cost.

Where legal monitoring is better:

• It is set up to find legal pages. A vendor's terms may pull in a privacy policy, DPA, subprocessor list and AI terms by link, and a generic tool only watches the URLs you give it.
• It aims to filter out noise. Generic tools can flag cookie banners, dates, menus and layout edits as changes.
• It explains meaning. A generic tool shows that a sentence changed; legal monitoring explains what changed and why it may matter to you. See change severity.
• It keeps a history per vendor, so you can see how its terms have moved over time. See terms version history.

Both share one limit: they only see public pages. A contract you negotiated and signed privately will not show up in either.

Why it matters to you

If you watch only a few vendor pages, a generic tool plus careful reading can be enough. The hard part grows with your vendor count. Ten vendors with five legal pages each is fifty pages, and every alert still needs someone to read the change and decide what it means.

Missing a change can cost you. Vendor terms can add fees, cut notice periods or widen how your data is used, and some give you only a set window to object or cancel. The comparison of manual and automated vendor monitoring looks at where each approach starts to break.

What to check

• Make a list of the exact legal URLs for each vendor, including linked policies, before you set up any tool.
• Test a generic tool on one page for a few weeks. Count how many alerts were real legal changes.
• Check that the tool shows the old and new text side by side, as a redline.
• Send alerts to a shared inbox, and decide who reads them and how fast.

How Venpo helps

Venpo watches only legal pages: your vendors' terms, privacy policies, DPAs, subprocessor lists and cookie policies. When one changes, it emails a plain-English alert with what changed and why it matters, and keeps a change history for each vendor.