How to monitor a website for changes
Maybe it's a competitor's pricing page, a job board, a supplier's terms or a product you're waiting to come back into stock. Whatever it is, checking it by hand gets old quickly. This guide walks through the main ways to keep an eye on a web page, what each one is good for, and how to avoid drowning in pointless alerts.
Option 1: Check it yourself, on a schedule
The simplest method costs nothing: bookmark the page and check it every Monday morning. It works for one or two pages that rarely change.
The trouble is memory and detail. You'll skip a week, and when you do look, it's hard to spot what's different unless something big moved. Small edits, like a price going from £24 to £26 or a sentence added to a policy, are easy to miss.
Option 2: Use RSS if the site offers it
Blogs, news sites and some changelogs publish an RSS feed, which lists new posts automatically. If the page you care about has one, an RSS reader will show you each new item.
RSS only covers new posts, though. It won't tell you that a pricing table changed or that a product page now says “out of stock”.
Option 3: A browser extension
Some extensions reload a page in the background and tell you when it changes. They're quick to set up and can check very often.
The catch is that they only run while your computer is on and the browser is open. Close the laptop for the weekend and nothing is being watched.
Option 4: An online change monitoring service
A monitoring service checks pages from its own servers on a schedule, keeps a copy of each version and emails you when something changes. Nothing has to stay open on your side.
When comparing services, look at:
- How often pages are checked on the plan you'd pay for
- Whether alerts explain the change or just show highlighted text
- How it handles noise like dates, counters and rotating adverts
- Whether you can watch one section of a page instead of all of it
- What it does with your data, especially if you're watching competitors
ChangeGist is one of these services. Its alerts say what changed in plain English, for example “A price went up from £24 to £28”, and it skips timestamp and counter noise.
Option 5: Write your own script
If you're technical, a small script can download a page, compare it with the last copy and email you. It's flexible and cheap.
Expect to spend time on the details: pages that load content with JavaScript, sites that block automated requests, storing old versions, and filtering out changes that don't matter.
How to avoid noisy alerts
Most people who give up on page monitoring do so because of noise. A few habits help:
- Watch a section, not the whole page. If you only care about the price, watch the price box.
- Pick a sensible frequency. Most business pages don't need checking more than a few times a day.
- Use a tool that ignores timestamps, view counts and rotating banners.
- Name each page clearly, so an alert tells you at a glance what it's about.
Before you start: check you're allowed
Only monitor pages that are public, and respect the site's terms. Some big platforms limit automated visits, so keep checks infrequent there. Never try to get around a site that blocks automated visitors.