Best and simplest way to monitor websites for changes, change detection, website checker, webpage change monitoring and webpage change detection tool - with alerts and notifications!
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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!
Taken from the repository README
Loading the full README.
Read the full README ↗Monitor websites for updates — get notified via Discord, Email, Slack, Telegram, Webhook and many more — Ideal for monitoring price changes, content edits, conditional changes, LLM Change summaries and triggers just to name few features.
Get started with website page change monitoring straight away. Don't have time? Try our $8.99/month subscription, use our proxies and support! , Same open-source changedetection.io, minus the hard parts, No infrastructure to baby-sit.
Stop 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".
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.
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.
Works 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, giving you seamless access to 100+ supported providers and models.
We've got a quick tutorial here - Bring your own LLM/AI Key to changedetection.io for change summaries and triggers.
Available when connected to a playwright content fetcher (included as part of our subscription service)
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.
Enable 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.
Easily 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!
Set price change notification parameters, upper and lower price, price change percentage and more. Always know when a product for sale drops in price.
Need an actual Chrome runner with Javascript support? We support fetching via WebDriver and Playwright!
POST or GET and other methodsWe recommend and use Bright Data global proxy services, Bright Data will match any first deposit up to $150 using our signup link.
Please :star: star :star: this project and help it grow! https://github.com/dgtlmoon/changedetection.io/
Easily configure conditional actions, 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
Easily set a re-check schedule, for example you could limit the web page change detection to only operate during business hours. Or perhaps based on a foreign timezone (for example, you want to check for the latest news-headlines in a foreign country at 0900 AM),
Includes quick short-cut buttons to setup a schedule for business hours only, or weekends.
Easily add the current web page to your changedetection.io tool, simply install the extension and click "Sync" to connect it to your existing changedetection.io install.
Goto the Chrome Webstore to download the extension. ( Or check out the GitHub repo )
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.
Alternative docker repository over at ghcr - ghcr.io/dgtlmoon/changedetection.io
See the install instructions at the wiki https://github.com/dgtlmoon/changedetection.io/wiki/Microsoft-Windows
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!
docker pull dgtlmoon/changedetection.io
docker kill $(docker ps -a -f name=changedetection.io -q)
docker rm $(docker ps -a -f name=changedetection.io -q)
docker run -d --restart always -p "127.0.0.1:5000:5000" -v datastore-volume:/datastore --name changedetection.io dgtlmoon/changedetection.io
docker compose pull && docker compose up -d
See the wiki for more information https://github.com/dgtlmoon/changedetection.io/wiki
If you are using the recommended sockpuppetbrowser (which is in the docker-compose.yml as a setting to be uncommented) you can easily set different viewport sizes for your web page change detection, see more information here about setting up different viewport sizes.
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.)
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:[email protected][email protected]
json://someserver.com/custom-api
syslog://
And everything else in this list!
Now you can also customise your notification content and use Jinja2 templating for their title and body!
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
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 https://github.com/dgtlmoon/changedetection.io/wiki/JSON-Selector-Filter-help for more information and examples
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.
<html>
...
<script type="application/ld+json">
{
"@context":"http://schema.org/",
"@type":"Product",
"offers":{
"@type":"Offer",
"availability":"http://schema.org/InStock",
"price":"3949.99",
"priceCurrency":"USD",
"url":"https://www.newegg.com/p/3D5-000D-001T1"
},
"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
See the wiki https://github.com/dgtlmoon/changedetection.io/wiki/Proxy-configuration , we also support using Bright Data proxy services where possible and Oxylabs proxy services.
Raspberry Pi and linux/arm/v6 linux/arm/v7 arm64 devices are supported! See the wiki for details
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.
Full REST API for programmatic management of watches, tags, notifications and more.
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 [email protected] 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
This software is provided "as-is", without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose, and non-infringement. In no event shall the authors or copyright holders be liable for any claim, damages, or other liability, whether in an action of contract, tort, or otherwise, arising from, out of, or in connection with the software or the use or other dealings in the software.
You are solely responsible for ensuring that your use of this software complies with the terms of service, robots.txt directives, access policies, and all applicable laws of any website or service you choose to monitor. The authors and contributors of this software accept no liability whatsoever for how you choose to use it or for any consequences arising from that use.
If you choose to enable AI / LLM features, content detected on monitored websites — including page diffs and extracted text — will be transmitted to a third-party AI provider of your choosing, outside of this installation. You are solely responsible for:
AI and LLM models are known to hallucinate — producing plausible-sounding but factually incorrect, incomplete, or entirely fabricated output with apparent confidence. By design, LLMs may also omit or silently truncate relevant information during summarisation. AI output must never be relied upon as complete or accurate.
By using this software, and in particular any AI / LLM features, you personally indemnify and hold harmless the author(s), contributor(s), and any associated parties from and against any and all claims, damages, losses, costs, and expenses (including reasonable legal fees) arising out of or in connection with your use of this software.
See docs/THIRD-PARTY-LICENSES.md for every bundled package and its licence, and NOTICE for attribution and licence elections.