n8n Webpage Change Alerts: Browserless + Gemini + Gmail

Get emailed only when a webpage meaningfully changes—automated with Browserless, Gemini, and Gmail

This n8n workflow monitors a specific webpage every 6 hours, captures screenshots to Google Drive, and uses Google Gemini to compare the latest and previous images—sending you a Gmail alert only when a meaningful change is detected.

What this workflow does

• Scheduled monitoring: Runs on a 6-hour schedule for your configured targetUrl.
• Screenshot capture + archival: Loads the page in Browserless, captures a screenshot, and uploads it to a chosen Google Drive folder using a timestamped filename.
• Baseline creation (first run): If the URL has never been tracked, the workflow saves the uploaded screenshot as the baseline in an n8n Data Table and emails a “baseline captured” message via Gmail.
• Change comparison (subsequent runs): If the URL is already tracked, it downloads the previously saved screenshot from Drive, bundles it with the new screenshot, and sends both to Google Gemini.
• AI-powered noise filtering: Gemini classifies the update as NO_CHANGE or CHANGED, with a one-sentence description while ignoring trivial visual noise.
• State tracking + alerts: The workflow updates the Data Table with the latest Drive screenshot ID and timestamp, then sends a Gmail email only when Gemini reports CHANGED.

Use cases

• Track pricing, feature updates, or landing page changes for a SaaS product you operate.
• Monitor competitor webpages or public announcements for material updates.
• Watch documentation pages and release notes to detect meaningful content changes.

Technical details

• Integrations: Browserless, Google Drive, Gmail, Google Gemini
• Core n8n nodes mentioned in this workflow: if, set, code, no op, gmail, data table
• Key configuration: Set targetUrl, driveFolderId, and notifyEmail, ensure Drive permissions for upload/download, and run once to create the site_watch_state Data Table baseline.