Web Site Change Detection, Monitoring and Notification.

Live your data-life pro-actively, track website content changes and receive notifications via Discord, Email, Slack, Telegram and 70+ more

Know when important content changes, we support notifications via Discord, Telegram, Home-Assistant, Slack, Email and 70+ more

Don't have time? Let us host it for you! try our $6.99/month subscription - use our proxies and support! , half the price of other website change monitoring services and comes with unlimited watches & checks!

• Automatic Updates, Automatic Backups, No Heroku "paused application", don't miss a change!
• Javascript browser included
• Unlimited checks and watches!

Example use cases

• Products and services have a change in pricing
• Out of stock notification and Back In stock notification
• 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
• 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)

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 and CSS Selectors, Easily monitor complex JSON with JsonPath rules
• Switch between fast non-JS and Chrome JS based "fetchers"
• 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

Screenshots

Examine differences in content.

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

Please ⭐ star ⭐ this project and help it grow! https://github.com/dgtlmoon/changedetection.io/

Filter by elements using the Visual Selector tool.

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

Installation

Docker

With Docker composer, just clone this repository and..

$ docker-compose up -d

Docker standalone

$ docker run -d --restart always -p "127.0.0.1:5000:5000" -v datastore-volume:/datastore --name changedetection.io dgtlmoon/changedetection.io

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

Windows

See the install instructions at the wiki https://github.com/dgtlmoon/changedetection.io/wiki/Microsoft-Windows

Python Pip

Check out our pypi page https://pypi.org/project/changedetection.io/

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

Then visit http://127.0.0.1:5000 , 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 changedetection.io

Docker

docker pull dgtlmoon/changedetection.io
docker kill $(docker ps -a|grep changedetection.io|awk '{print $1}')
docker rm $(docker ps -a|grep changedetection.io|awk '{print $1}')
docker run -d --restart always -p "127.0.0.1:5000:5000" -v datastore-volume:/datastore --name changedetection.io dgtlmoon/changedetection.io

docker-compose

docker-compose pull && docker-compose up -d

See the wiki for more information https://github.com/dgtlmoon/changedetection.io/wiki

Filters

XPath, JSONPath 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:math and re:replace.)

Notifications

ChangeDetection.io 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

discord://webhook_id/webhook_token
flock://app_token/g:channel_id
gitter://token/room
gchat://workspace/key/token
msteams://TokenA/TokenB/TokenC/
o365://TenantID:AccountEmail/ClientID/ClientSecret/TargetEmail
rocket://user:password@hostname/#Channel
mailto://user:pass@example.com?to=receivingAddress@example.com
json://someserver.com/custom-api
syslog://

And everything else in this list!

Now you can also customise your notification content!

JSON API Monitoring

Detect changes and monitor data in JSON API's by using the built-in JSONPath selectors as a filter / selector.

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

Parse JSON embedded in HTML!

When you enable a json: 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.

<html>
...
<script type="application/ld+json">
  {"@context":"http://schema.org","@type":"Product","name":"Nan Optipro Stage 1 Baby Formula  800g","price": 23.50 }
</script>

json:$.price would give 23.50, or you can extract the whole structure

Proxy configuration

See the wiki https://github.com/dgtlmoon/changedetection.io/wiki/Proxy-configuration

Raspberry Pi support?

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

Support us

Do you use changedetection.io 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 dgtlmoon@gmail.com for any enquiries, I am more than glad to work with your organisation to further the possibilities of what can be done with changedetection.io