Vigilmark — Local Page Watch

Watch one element on an open page for a meaningful change, entirely in your browser.

Some page changes matter enough to watch, but not enough to hand the whole page to an online monitoring service. Vigilmark watches one element on one exact, already-open page. Pick the signal, choose what should count as a change, and let Chrome check it on a bounded local schedule. Choose a meaningful signal - Alert when the selected text changes - Alert when a keyword appears or disappears - Alert when the first visible number crosses above or below a target - Check every 30 seconds, 1 minute, 5 minutes, or 15 minutes - Review all armed watches and concise before/after signal records in the Control Room Guardrails you can see - The exact URL and open tab are locked when you arm a watch Navigation, cross-origin redirects, permission loss, or a missing element pause the watch - Editing a form field pauses monitoring before Chrome reloads the page - Every arming stops after seven days or 500 reloads - A detected condition stops its watch instead of repeatedly notifying - Up to eight watches can be retained locally Private by design - No Vigilmark account, advertising, analytics, tracking, telemetry, or affiliate links - No remote code or developer-controlled network requests - No hidden tabs, auto-clicking, scripts, CAPTCHA handling, webhooks, email alerts, or cloud monitoring - Full page content, credentials, and form values are not saved - The exact armed URL, locator, settings, capped signal excerpts, and local status remain in your browser Removing the last watch for a site releases that site’s optional permission Clear my data stops all watches and removes local records, alarms, notifications, drafts, and optional site access Vigilmark reloads the already-open page you chose. That normal page reload contacts the website under its own privacy policy, just as reloading the tab yourself would. Vigilmark does not send the resulting page content to its developer. Vigilmark intentionally does not support Chrome internal pages, the Chrome Web Store, local files, built-in PDF viewers, pages that prevent extension injection, closed tabs, or elements that no longer exist. Vigilmark is a local page-change aid, not a guarantee of product availability, appointment access, ticket access, price accuracy, or uninterrupted monitoring. Chrome and the computer must be running, and the original page must remain open. Suggested search themes - Use naturally in the listing where accurate; do not keyword-stuff: - page change alert - restock monitor - availability monitor - appointment slot monitor - website element monitor - keyword alert - number threshold alert - local page monitor