changedetection.io

The software monitors web pages for content changes and sends real‑time notifications through a wide range of channels, including Discord, Slack, Telegram, email, webhooks and many others. It can track price fluctuations, stock availability, text edits, and other conditional changes, presenting differences at the word, line or character level. Users can target specific page elements with a visual selector and define interactive browser steps such as logins, form submissions or button clicks to handle dynamic sites.

An optional AI layer allows users to write plain‑English intents that filter alerts, for example notifying only when a price drops below a threshold or when an item returns to stock. The AI also generates natural‑language summaries of each change, leveraging any compatible LLM provider or a local Ollama instance. This reduces noise by suppressing irrelevant diffs.

The project is self‑hostable, open‑source under the Apache‑2.0 license, and offered without subscription requirements in its core version. It includes a Chrome browser for JavaScript rendering, supports visual element selection, and provides extensive integration options for alert delivery.