Website Change Monitor — Page Diff & Change Alerts
Pricing
from $0.88 / 1,000 page checks
Monitor any web page for content changes between runs. Each check hashes the page (or a CSS-selected part of it), compares it with the previous snapshot, and returns a line-level diff on change. Optional JavaScript rendering and webhook alerts.
🔗 SINGLE PAGE CHECK: one page, one row — first_check on the first run, then unchanged or changed with a diff.
🔗 Used when the bulk list and list file are empty. Any public http(s) page works; a bare address is read as https://.
🚫 Not supported: pages behind a login, private/internal addresses, non-web links.
🚀 BULK CHECKING: watches many pages in one run — one row per page.
📊 TIER LIMITS:
💡 TIP: Watching a single page? Use the single URL field above.
📋 BULK EDIT: click "Bulk edit" to paste URLs, one per line 📄 TEXT FILE: upload a .txt of URLs, or paste its link in the field below 🔁 Duplicates are removed automatically — you are never charged twice for the same page in one run
📄 REMOTE LIST: a plain-text file with one page URL per line, fetched once at run start.
📄 What works: any public text file URL — a GitHub raw file, a pastebin, your own host.
💡 TIP: great for keeping a shared watchlist outside Apify; edit the file, not the task.
⚠️ Lines starting with # are ignored. The file is read once per run — it is not monitored itself.
🎯 SCOPED CHECK: watch only one part of each page — a price block, a spec table, one heading. Right-click the part in your browser, choose Inspect, and copy its class or id.
💡 The best defense against false alarms: a nav or banner tweak stays invisible.
🔧 Empty = the whole page. Scripts, styles and navigation are ALWAYS ignored, selector or not. A selector that matches nothing returns a clear error row, never a charge.
⚙️ FOR JS-BUILT PAGES: loads each page in a real browser session before hashing, so content that only exists after scripts run is captured.
⚙️ When you need it: the page looks empty when you view source, or your first check returns almost no text.
💰 Rendered checks cost a little more per page — leave this OFF for normal pages.
💡 TIP: if a page blocks plain requests with 403 but loads fine in your browser, try this.
🔔 INSTANT ALERTS: every page that reports a change posts one JSON event to this URL — url, selector, diff excerpt, hashes, checked time.
🔔 What works: n8n and Make webhook nodes, Zapier catches, Slack incoming webhooks, your own endpoint.
💡 TIP: pair with an Apify schedule and you have a full monitoring pipeline in two fields.
⚠️ Alerts are best-effort: a webhook that is down never fails your run, and pages that did not change stay silent.
