It's a browser extension (Chrome + Firefox) and web dashboard that monitors any webpage and shows you exactly what changed — like a git diff for websites. Additions are highlighted in green, removals in red, with a full snapshot timeline to compare any two versions.
What makes it different from existing tools:
- Element inspector: click any part of a page to track just that element (a price, a stock status, a headline) — skip the noise from ads and timestamps
- Snapshot timeline: browse every captured version of a page and compare any two side by side, like git log for websites
- RSS feeds: every watch gets its own feed URL, plus feeds per tag and a master feed. Wire it into your reader instead of getting spammed with alerts
- MCP server (@site-spy/mcp-server): Claude, Cursor, and other AI agents can monitor sites and summarize changes for you
- Notifications: browser push, email, and Telegram — get alerted the moment something changes
Chrome: https://chromewebstore.google.com/detail/site-spy/jeapcpanag...
Firefox: https://addons.mozilla.org/en-GB/firefox/addon/site-spy/
Docs: https://docs.sitespy.app
I am a solo developer and am happy to answer any questions you may have about the architecture.