Developer Vitaly Kuprin built Site Spy to do one thing well: track webpage changes and make those changes accessible to both humans and AI agents. The tool monitors content on configurable schedules from one minute to weekly, captures text and screenshot snapshots, and surfaces changes through a visual diff view — additions in green, removals in red. Users manage tracked URLs through a web dashboard, Chrome and Firefox extensions, and RSS feeds that work with aggregators like Feedly and Inoreader. Notification channels include browser push, email, Telegram, and over 90 webhook integrations.
The native MCP integration is what separates Site Spy from older monitoring tools. The @site-spy/mcp-server npm package exposes the service's capabilities to any MCP-compatible AI environment, including Claude Desktop and Cursor. After configuring an API key through a standard JSON snippet that invokes the server via npx, agents can programmatically add URLs to a watchlist, retrieve snapshots, compare versions, and get natural-language summaries of what changed — without leaving the chat interface. The practical range of use cases is wide: an agent could track a competitor's pricing page and flag changes, monitor a regulator's guidance documents for compliance teams, or watch product restock pages and act on availability. Site Spy is among the first commercial web-monitoring tools to ship <a href="/news/2026-03-14-agent-browser-protocol-abp-chromium-fork-ai-agent-web-navigation">MCP integration</a> as a first-party feature rather than a third-party adapter.
Pricing is freemium: the free tier covers five URLs with hourly checks, Starter is €4 per month for 25 URLs at 10-minute intervals, and Pro is €8 per month for 100 URLs, one-minute checks, screenshot capture, and priority support. The competitive landscape is crowded. Hacker News discussion after the launch pointed to changedetection.io — an open-source, self-hostable alternative with Playwright-driven browser automation, a visual element selector, and price and restock detection — as a zero-cost option for self-hosters. FreshRSS, a self-hosted RSS aggregator with a built-in web scraper, drew similar mentions. Site Spy's case rests on its hosted setup, the absence of any self-hosting requirement, and the MCP integration that neither open-source rival currently matches.