SiteSpy

What it does

Site Spy is a website change monitoring tool that tracks webpages for updates and notifies you when content changes. It uses AI to filter out noise (timestamps, cookie banners, dynamic ads) and focuses on what you specify in plain English — like "price drops", "new listings", or "when tickets go on sale". The tool provides visual diff highlighting (additions in green, removals in red), a snapshot timeline for comparing versions, and RSS feeds for each watched page. It also offers an MCP server for integration with AI assistants like Claude and Cursor.

Who it is for

Site Spy is designed for individuals and teams who need to monitor website changes without manual CSS selector setup. Use cases include:

• Price tracking – monitor product pages for price drops or availability changes.
• Job alerts – watch career pages for new listings.
• Competitor monitoring – track competitor websites for content or pricing updates.
• Stock availability – get notified when items come back in stock.
• News & content changes – follow specific pages for updates.

The tool is available as a browser extension (Chrome and Firefox) and a web dashboard that works on any device. It also targets developers who want to integrate monitoring into their workflows via API or MCP.

Why it matters

Traditional website monitoring tools require users to manually select CSS selectors or draw boxes around page areas, which is time-consuming and fragile when page layouts change. Site Spy's AI-driven approach lets users describe what they care about in natural language, and the AI auto-configures filters to ignore irrelevant changes. This reduces false alerts and setup effort. The inclusion of RSS feeds and MCP integration makes it easy to pipe changes into existing tools and AI workflows.

Launch signal

Site Spy was launched on Hacker News as a Show HN post titled "I built a tool that watches webpages and exposes changes as RSS". The product is actively developed by a solo founder (vkuprin) and is available with a free tier (2 watched URLs, 1-hour minimum recheck, 5 snapshots per watch, 30-day history). Paid plans start at €4/month for 25 URLs and faster checks.

Brand and naming

The name "Site Spy" is straightforward and memorable, combining "site" (website) with "spy" (monitoring). It clearly communicates the product's purpose: watching websites for changes. The tagline "Watch webpages and expose changes as RSS" is descriptive but could be more benefit-driven. The brand positions itself as an AI-powered alternative to legacy tools like Visualping and Distill, emphasizing ease of use and smart filtering.