- The best and simplest self-hosted open source website change detection monitoring and notification service. An alternative to Visualping, Watchtower etc. Designed for simplicity - the main goal is to simply monitor which websites had a text change. Open source web page change detection - Now also includes JSON API change detection and monitoring support!

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7 months ago
Last commit
7 months ago
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Web Site Change Detection, Restock monitoring and notifications.

Detect website content changes and perform meaningful actions - trigger notifications via Discord, Email, Slack, Telegram, API calls and many more.

Live your data-life pro-actively.

Get started with website page change monitoring straight away. Don't have time? Try our $8.99/month subscription, use our proxies and support! , half the price of other website change monitoring services!

  • Chrome browser included.
  • Nothing to install, access via browser login after signup.
  • Super fast, no registration needed setup.
  • Get started watching and receiving website change notifications straight away.

Target specific parts of the webpage using the Visual Selector tool.

Available when connected to a playwright content fetcher (included as part of our subscription service)

Easily see what changed, examine by word, line, or individual character.

Perform interactive browser steps

Fill in text boxes, click buttons and more, setup your changedetection scenario.

Using 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.

After Browser Steps have been run, then visit the Visual Selector tab to refine the content you're interested in. Requires Playwright to be enabled.

Example use cases

  • Products and services have a change in pricing
  • Out of stock notification and Back In stock notification
  • Monitor and track PDF file changes, know when a PDF file has text changes.
  • Governmental department updates (changes are often only on their websites)
  • New software releases, security advisories when you're not on their mailing list.
  • Festivals with changes
  • Discogs restock alerts and monitoring
  • Realestate listing changes
  • Know when your favourite whiskey is on sale, or other special deals are announced before anyone else
  • COVID related news from government websites
  • University/organisation news from their website
  • Detect and monitor changes in JSON API responses
  • JSON API monitoring and alerting
  • Changes in legal and other documents
  • Trigger API calls via notifications when text appears on a website
  • Glue together APIs using the JSON filter and JSON notifications
  • Create RSS feeds based on changes in web content
  • Monitor HTML source code for unexpected changes, strengthen your PCI compliance
  • 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)
  • Get notified when certain keywords appear in Twitter search results
  • Proactively search for jobs, get notified when companies update their careers page, search job portals for keywords.
  • Get alerts when new job positions are open on Bamboo HR and other job platforms
  • Website defacement monitoring
  • Pokémon Card Restock Tracker / Pokémon TCG Tracker
  • RegTech - stay ahead of regulatory changes, regulatory compliance

Need an actual Chrome runner with Javascript support? We support fetching via WebDriver and Playwright!

Key Features

  • Lots of trigger filters, such as "Trigger on text", "Remove text by selector", "Ignore text", "Extract text", also using regular-expressions!
  • Target elements with xPath(1.0) and CSS Selectors, Easily monitor complex JSON with JSONPath or jq
  • Switch between fast non-JS and Chrome JS based "fetchers"
  • Track changes in PDF files (Monitor text changed in the PDF, Also monitor PDF filesize and checksums)
  • Easily specify how often a site should be checked
  • Execute JS before extracting text (Good for logging in, see examples in the UI!)
  • Override Request Headers, Specify POST or GET and other methods
  • Use the "Visual Selector" to help target specific elements
  • Configurable proxy per watch
  • Send a screenshot with the notification when a change is detected in the web page

We recommend and use Bright Data global proxy services, Bright Data will match any first deposit up to $100 using our signup link.

Oxylabs is also an excellent proxy provider and well worth using, they offer Residental, ISP, Rotating and many other proxy types to suit your project.

Please ⭐ star ⭐ this project and help it grow!

Installation Docker

With Docker composer, just clone this repository and..

$ docker-compose up -d

Docker standalone

$ docker run -d --restart always -p "" -v datastore-volume:/datastore --name dgtlmoon/

:latest tag is our latest stable release, :dev tag is our bleeding edge master branch.

Alternative docker repository over at ghcr -


See the install instructions at the wiki

Python Pip

Check out our pypi page

$ pip3 install
$ -d /path/to/empty/data/dir -p 5000

Then visit , You should now be able to access the UI.

Now with per-site configurable support for using a fast built in HTTP fetcher or use a Chrome based fetcher for monitoring of JavaScript websites!

Updating Docker

docker pull dgtlmoon/
docker kill $(docker ps -a -f -q)
docker rm $(docker ps -a -f -q)
docker run -d --restart always -p "" -v datastore-volume:/datastore --name dgtlmoon/
docker-compose pull && docker-compose up -d

See the wiki for more information


XPath(1.0), JSONPath, jq, and CSS support comes baked in! You can be as specific as you need, use XPath exported from various XPath element query creation tools. (We support LXML re:test, re:match and re:replace.)

Notifications supports a massive amount of notifications (including email, office365, custom APIs, etc) when a web-page has a change detected thanks to the apprise library. Simply set one or more notification URL's in the [edit] tab of that watch.

Just some examples


And everything else in this list!

Now you can also customise your notification content and use Jinja2 templating for their title and body!

JSON API Monitoring

Detect changes and monitor data in JSON API's by using either JSONPath or jq to filter, parse, and restructure JSON as needed.

This will re-parse the JSON and apply formatting to the text, making it super easy to monitor and detect changes in JSON API results

JSONPath or jq?

For more complex parsing, filtering, and modifying of JSON data, jq is recommended due to the built-in operators and functions. Refer to the documentation for more specific information on jq.

One big advantage of jq is that you can use logic in your JSON filter, such as filters to only show items that have a value greater than/less than etc.

See the wiki for more information and examples

Parse JSON embedded in HTML!

When you enable a json: or jq: filter, you can even automatically extract and parse embedded JSON inside a HTML page! Amazingly handy for sites that build content based on JSON, such as many e-commerce websites.

<script type="application/ld+json">

{ "@context":"", "@type":"Product", "offers":{ "@type":"Offer", "availability":"", "price":"3949.99", "priceCurrency":"USD", "url":"" }, "description":"Cobratype King Cobra Hero Desktop Gaming PC", "name":"Cobratype King Cobra Hero Desktop Gaming PC", "sku":"3D5-000D-001T1", "itemCondition":"NewCondition" } </script>

json:$..price or jq:..price would give 3949.99, or you can extract the whole structure (use a JSONpath test website to validate with)

The application also supports notifying you that it can follow this information automatically

Proxy Configuration

See the wiki , we also support using Bright Data proxy services where possible and Oxylabs proxy services.

Raspberry Pi support?

Raspberry Pi and linux/arm/v6 linux/arm/v7 arm64 devices are supported! See the wiki for details

Import support

Easily import your list of websites to watch for changes in Excel .xslx file format, or paste in lists of website URLs as plaintext.

Excel import is recommended - that way you can better organise tags/groups of websites and other features.

API Support

Supports managing the website watch list via our API

Support us

Do you use to make money? does it save you time or money? Does it make your life easier? less stressful? Remember, we write this software when we should be doing actual paid work, we have to buy food and pay rent just like you.

Firstly, consider taking out a change detection monthly subscription - unlimited checks and watches , even if you don't use it, you still get the warm fuzzy feeling of helping out the project. (And who knows, you might just use it!)

Or directly donate an amount PayPal

Or BTC 1PLFN327GyUarpJd7nVe7Reqg9qHx5frNn

Commercial Support

I offer commercial support, this software is depended on by network security, aerospace , data-science and data-journalist professionals just to name a few, please reach out at for any enquiries, I am more than glad to work with your organisation to further the possibilities of what can be done with

Third-party licenses

changedetectionio.html_tools.elementpath_tostring: Copyright (c), 2018-2021, SISSA (Scuola Internazionale Superiore di Studi Avanzati), Licensed under MIT license

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