Site Spy – Track webpage changes with diffs, element picking, and RSS
Element picker tracks specific content, MCP server lets AI agents monitor sites automatically.

Firecrawl adds monitoring to their 125k-star scraping infra with webhook alerts.
Developers tracking documentation, changelogs, or competitor sites
Visualping · ChangeDetection · Uptime Robot
Element picker tracks specific content, MCP server lets AI agents monitor sites automatically.
The dashboard exposes cron/interval scheduling, timezone support, retries, execution history, realtime metrics and API-key login, and it runs with a single docker-compose up — exactly the pragmatic feature set you'd want for hosting private webhooks. It isn't reinventing scheduling (Airflow, Rundeck and hosted cron services already exist), but it's a tidy, usable package for teams that want a lightweight, self-hosted alternative with a Python SDK.
GPT-4o visual selectors beat CSS, but Distill.io and Syte already own website monitoring.
Wraps chaotic USITC API into versioned JSON; nightly diffs + webhooks beat scraper maintenance.
Email-to-JSON webhooks with built-in cron, simpler than configuring Mailgun inbound routes.
Removes CSS selector friction with AI visual selection, but Distill.io and Versionista own this category.