Content Change Monitoring

What is content change monitoring?

Content change monitoring is the practice of tracking specific pieces of content on web pages over time and receiving alerts when those pieces change. It's distinct from availability monitoring (which checks if a page loads) and performance monitoring (which tracks load time). Content monitoring checks what the page says.

A content monitor targets a specific CSS selector — the price span on a product page, the hero headline on a competitor's homepage, the stock status label on a listing — and records its value. When the value changes, an alert fires with the old text and the new text.

When do you need it?

How to set up a content monitor

The key to useful content monitoring is choosing the right CSS selector. Too broad and you get noise from dynamic content. Too narrow and a small HTML change breaks your selector.

Best practice is to target an element with a stable, semantic class or ID — like .product-price or #plan-pro .price — rather than positional selectors like div:nth-child(3) span that break when page layout changes.

Interpreting change alerts

Every WatchPage content change alert includes the previous value, the new value, the URL, and a timestamp. This means your team always knows the direction of change — price increased or decreased, stock label changed from "in stock" to "limited" — without having to visit the page to investigate.