Monitor One Part of a Web Page with a CSS Selector
Most pages change constantly in ways you don't care about. Point Site Monitor at one element — a price, a table, a list of dates — and only changes there will alert you.
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Free plan · 10 URLs · hourly checks · 2 AI summaries/mo · no credit card
Updated
- Price changed from $249.00 to $199.00
How it works
Find the element
In your browser, right-click the part you care about and choose Inspect. Note its id or class, e.g. #pricing or .event-list.
Add it as the selector
Paste the URL and the selector when you add the monitor. Any valid CSS selector works.
Only real changes alert you
Site Monitor fingerprints just that element. Everything else on the page is ignored.
You choose which alerts each URL sends — downtime, content changes, slow responses — and we email you when they happen.
Common selectors
- #pricing — a pricing table
- .price or [itemprop=price] — a product price
- .event-list li — a list of dates
- main article — the body of a doc or policy
- .availability — a stock label
The fastest way to cut false alerts
Timestamps, rotating banners, 'people viewing now' counters, and ad slots are the biggest sources of false change alerts. Scoping to one element removes them without any extra configuration.
Frequently asked questions
What if the selector matches nothing?
Site Monitor skips the comparison rather than sending a false alert. If a site is redesigned, check the monitor's recent results and update the selector to match the new layout.
Can I use complex selectors?
Yes — any standard CSS selector, including attribute selectors and descendant combinators.
Does it work on pages that load content with JavaScript?
Yes. Site Monitor can render the page in a headless browser before fingerprinting it, so content injected by JavaScript is included in the comparison.
Will rotating ads, timestamps, or counters cause false alerts?
Not if you scope the watch. Add a CSS selector (for example #pricing or .event-list) and Site Monitor fingerprints only that element — everything else on the page is ignored. Whitespace-only changes never trigger an alert.
Is Site Monitor free?
Yes. The Free plan covers 10 URLs checked every hour, with 2 AI change summaries a month — no credit card required. Upgrade only if you need faster checks, more URLs, or more AI summaries.
How often does Site Monitor check a page?
Free checks every hour. Paid plans check as often as every 5 minutes, and you can set the interval per URL.
Start watching your first page
Start watching free → Explore the live demo
Free plan · 10 URLs · hourly checks · 2 AI summaries/mo · no credit card