Get told when a page changes.
Watch any public URL. SiteTester re-checks it on a schedule and alerts you the moment its content, structure, headings, or status code changes — the silent edits you'd otherwise miss.
How it works. Each monitor stores a fingerprint of the page — a hash of its visible text and its markup structure, plus title, headings, and element counts. On every check it re-fingerprints and compares. A change in content, structure, title, heading, or HTTP status is recorded on the timeline and (if you add a webhook) pushed to Slack, Discord, or any endpoint.
- Monitors are private to this browser (an anonymous device key — no account needed).
- Scheduled checks run server-side; you can also Check now any time.
- Severity: content edits are moderate, structure / title / heading changes are high, a status-code break is critical.