Content
Change Detection
Change detection is the practice of monitoring a webpage for content modifications and alerting when something changes. It applies to text, images, prices, structured data, and full-page screenshots.
Part of Competitor price monitoring — the full answer, the facts and the alternatives in one place.
In depth
Change detection is broader than visual regression: it also covers DOM-level comparison, keyword presence/absence (e.g. ensuring 'Add to cart' appears on every product page), structured-data changes, and JSON-API response shape monitoring.
Triggers are configurable — alert on any change, alert only on changes to a specific selector, alert only when a keyword disappears, alert when a price moves outside a range.
Why it matters
Change detection catches problems no other monitor sees: a CMS user accidentally publishing a draft, a third-party widget swapping in different content, a legal page being modified without legal review, a competitor changing their pricing.
How Lemwatch helps with change detection
Lemwatch monitors change detection continuously and alerts you the moment something changes.
Change detection →Related terms
Visual Regression
A visual regression is an unintended visual change to a webpage — a button moved, text colour changed, a secti…
Money Page
A money page is a webpage directly responsible for revenue — the homepage, a pricing page, a checkout flow, a …
Broken Link
A broken link is a hyperlink that no longer points to a working destination — typically returning a 404 (not f…
Browse the full Lemwatch monitoring glossary (47 terms).