Changedetection.io detect changes in websites and JSON feeds
Best and simplest tool for website change detection, web page monitoring, and website change alerts. Perfect for tracking content changes, price drops, restock alerts, and website defacement monitoring—all for free or enjoy our SaaS plan! - dgtlmoon/changedetection.io
Changedetection.io detect changes in websites and JSON feeds launched on January 3, 2022 with 147 votes, #197 of 2,891 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 4 years on.
In plain words
Changedetection.io is a web monitoring tool that tracks changes to websites and JSON feeds. Users can set up notifications when specified pages or data sources are modified, eliminating the need for manual checking. The service is useful for anyone who needs to stay informed about updates to specific online content, from price changes to news updates. It's open-source and available on GitHub.
written from the facts on this page · September 2026
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I built a tool that watches webpages and exposes changes as RSSMar 2026 · sitespy.app · ▲320I built Site Spy after missing a visa appointment slot because a government page changed and I didn’t notice for two weeks. It watches webpages for changes and shows the result like a diff. The part I think HN might find interesting is that it can monitor a specific element on a page, not just the whole page, and it can expose changes as RSS feeds. So instead of tracking an entire noisy page, you can watch just a price, a stock status, a headline, or a specific content block. When it changes, you can inspect the diff, browse the snapshot history, or follow the updates in an RSS reader. It’s…
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