{"repo":"dgtlmoon/changedetection.io","free":true,"listed":false,"github":"https://github.com/dgtlmoon/changedetection.io","clone":"git clone https://github.com/dgtlmoon/changedetection.io.git","description":"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!","language":"Python","stars":33189,"topics":["back-in-stock","change-alert","change-detection","change-monitoring","monitoring","notifications","restock-monitor","rss","self-hosted","url-monitor","web-scraping","website-change-detection","website-change-detector","website-change-monitor","website-change-notification","website-change-tracker","website-defacement-monitoring","website-monitor","website-monitoring","website-watcher"],"license":"Apache-2.0","category":"web_monitoring","readme_excerpt":"# Detect Website Changes Automatically — Monitor Web Page Changes in Real Time\n\nMonitor websites for updates — get notified via Discord, Email, Slack, Telegram, Webhook and many more.\n\n**Detect web page content changes and get instant alerts.** \n\nIdeal for monitoring price changes, content edits, conditional changes and more.\n\n\n[\"Web](https://changedetection.io?src=github)\n\n[![Release Version][release-shield]][release-link] [![Docker Pulls][docker-pulls]][docker-link] [![License][license-shield]](LICENSE.md)\n\n![changedetection.io](https://github.com/dgtlmoon/changedetection.io/actions/workflows/test-only.yml/badge.svg?branch=master)\n\n[**Get started with website page change monitoring straight away. Don't have time? Try our $8.99/month subscription, use our proxies and support!**](https://changedetection.io) , _half the price of other website change monitoring services!_\n\n\n- Chrome browser included.\n- Nothing to install, access via browser login after signup.\n- Super fast, no registration needed setup.\n- Get started watching and receiving website change notifications straight away.\n- See our [tutorials and how-to page for more inspiration](https://changedetection.io/tutorials) \n\n## AI-powered website change detection — smart alerts and plain-language summaries\n\nStop drowning in noise. Connect any LLM (OpenAI, Gemini, Anthropic, Ollama and more) and go from _\"something changed\"_ to _\"only the thing you care about changed\"_.\n\n**AI change detection rules** — write a plain-English intent once: _\"notify me only when the price drops below $50\"_, _\"alert me when the item comes back in stock\"_, _\"ignore navigation and footer changes\"_. The AI evaluates every detected diff against your intent and silently suppresses everything irrelevant. Fewer false positives, zero noise.\n\n**AI change summaries** — instead of staring at a raw diff, your notification reads _\"Price dropped from $89.99 to $67.00\"_ or _\"3 new products added to the listing\"_. Works globally or per-watch, with full control over the prompt.\n\nWorks with any model you already pay for — GPT-4o-mini and Gemini Flash handle this well at fractions of a cent per check. Or run it entirely locally with **Ollama**, **vLLM**, **LM Studio**, or any **OpenAI-compatible self-hosted endpoint** — pick the *OpenAI-compatible (vLLM, LM Studio, llama.cpp)* option in the provider dropdown and point it at your server's `/v1` URL. Powered by [LiteLLM](https://github.com/BerriAI/litellm), giving you seamless access to [100+ supported providers and models](https://docs.litellm.ai/docs/providers).\n\n[\"AI-powered](https://changedetection.io?src=github)\n\n_Note: Available in our subscription/hosted service from June 2026_\n\n### Target specific parts of the webpage using the Visual Selector tool.\n\nAvailable when connected to a playwright content fetcher (included as part of our subscription service)\n\n[\"Select](https://changedetection.io?src=github)\n\n### Easily see what changed, examine by word, line, or individual character.\n\n[\"Self-hosted](https://changedetection.io?src=github)\n\n\n### Perform interactive browser steps\n\nFill in text boxes, click buttons and more, setup your changedetection scenario. \n\nUsing the **Browser Steps** configuration, add basic steps before performing change detection, such as logging into websites, adding a product to a cart, accept cookie logins, entering dates and refining searches.\n\n[\"Website](https://changedetection.io?src=github)\n\nAfter **Browser Steps** have been run, then visit the **Visual Selector** tab to refine the content you're interested in.\nRequires Playwright to be enabled.\n\n### Awesome restock and price change notifications\n\nEnable the _\"Re-stock & Price detection for single product pages\"_ option to activate the best way to monitor product pricing, this will extract any meta-data in the HTML page and give you many options to follow the pricing of the product.\n\nEasily organise and monitor prices for products from the dashboard, get alerts and notifications when the price of a product changes or comes back in stock again!\n\n[\"Easily](https://changedetection.io?src=github)\n\nSet price change notification parameters, upper and lower price, price change percentage and more.\nAlways know when a product for sale drops in price.\n\n[\"Set](https://changedetection.io?src=github)\n\n\n\n### Example use cases\n\n- Products and services have a change in pricing\n- _Out of stock notification_ and _Back In stock notification_\n- Monitor and track PDF file changes, know when a PDF file has text changes.\n- Governmental department updates (changes are often only on their websites)\n- New software releases, security advisories when you're not on their mailing list.\n- Festivals with changes\n- Discogs restock alerts and monitoring\n- Realestate listing changes\n- Know when your favourite whiskey is on sale, or other special deals are announced before anyone else\n- COVID related news from government websites\n- University/organisation news from their website\n- Detect and monitor changes in JSON API responses \n- JSON API monitoring and alerting\n- Changes in legal and other documents\n- Trigger API calls via notifications when text appears on a website\n- Glue together APIs using the JSON filter and JSON notifications\n- Create RSS feeds based on changes in web content\n- Monitor HTML source code for unexpected changes, strengthen your PCI compliance\n- You have a very sensitive list of URLs to watch and you do _not_ want to use the paid alternatives. (Remember, _you_ are the product)\n- Get notified when certain keywords appear in Twitter search results\n- Proactively search for jobs, get notified when companies update their careers page, search job portals for keywords.\n- Get alerts when new job positions are open on Bamboo HR and other job platforms\n- Website defacement monitoring\n- Pokémon Card Restock Tracker / Pokémon TCG Tracker\n- RegTech - stay ahead of regulatory changes, regulatory compliance\n\n_Need an actual Chrome runner with Javascript support? We support fetching via WebDriver and Playwright!_\n\n#### Key Features\n\n- Lots of trigger filters, such as \"Trigger on text\", \"Remove text by selector\", \"Ignore text\", \"Extract text\", also using regular-expressions!\n- Target elements with xPath 1 and xPath 2, CSS Selectors, Easily monitor complex JSON with JSONPath or jq\n- Switch between fast non-JS and Chrome JS based \"fetchers\"\n- Track changes in PDF files (Monitor text changed in the PDF, Also monitor PDF filesize and checksums)\n- Easily specify how often a site should be checked\n- Execute JS before extracting text (Good for logging in, see examples in the UI!)\n- Override Request Headers, Specify `POST` or `GET` and other methods\n- Use the \"Visual Selector\" to help target specific elements\n- Configurable [proxy per watch](https://github.com/dgtlmoon/changedetection.io/wiki/Proxy-configuration)\n- Send a screenshot with the notification when a change is detected in the web page\n\nWe [recommend and use Bright Data](https://brightdata.grsm.io/n0r16zf7eivq) global proxy services, Bright Data will match any first deposit up to $150 using our signup link.\n\nPlease :star: star :star: this project and help it grow! https://github.com/dgtlmoon/changedetection.io/\n\n### Conditional web page changes\n\nEasily [configure conditional actions](https://changedetection.io/tutorial/conditional-actions-web-page-changes), for example, only trigger when a price is above or below a preset amount, or [when a web page includes (or does not include) a keyword](https://changedetection.io/tutorial/how-monitor-keywords-any-website)\n\n\"Conditional\n\n### Schedule web page watches in any timezone, limit by day of week and time.\n\nEasily set a re-check schedule, for example you could limit the web page change detection to only operate during business hours.\nOr perhaps based on a foreign timezone (for example, you want to check for the latest news-headlines in a foreign country at 0900 AM),\n\n