Overview
changedetection.io is a self-hosted web-page change detection and notification service. It watches URLs on a configurable schedule, diffs the content using visual, text, or JSON/XPath selectors, and fires alerts via 80+ notification channels (email, Slack, Telegram, webhooks, etc.). It supports JavaScript-rendered pages via Playwright/Selenium browsers, and can monitor price changes, stock availability, or any structured data on a page. Deployment is a single Docker container or Docker Compose.
Where it falls short of Zapier
- No multi-step workflow automation — it only watches and notifies, not acts on changes
- JavaScript-heavy sites require a separately configured Playwright browser container
- No native API for programmatic watch management (REST API is limited)
- Cannot extract and transform data into downstream systems without additional tools
We list the gaps honestly so you can decide if the trade-off is worth owning your data.
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