Show HN: Site Spy – Track webpage changes with diffs, element picking, and RSS https://ift.tt/W7Fzs3k

Show HN: Site Spy – Track webpage changes with diffs, element picking, and RSS I built Site Spy after missing a visa appointment slot because a government page updated its requirements and I didn't notice for two weeks. 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://ift.tt/UWgXisr... Firefox: https://ift.tt/xkUTDZv Docs: https://ift.tt/Ucvh8XY I am a solo developer and am happy to answer any questions you may have about the architecture. https://sitespy.app March 11, 2026 at 12:21PM