Simple thing I made to check if a site has changed or not. It uses libnotify to send notifications, which is a Linux thing. If you're on something else, you'll want to switch to something like node-notifier.

The .env file contains the following arguments:

• SITEURL: The URL to check
• TYPE: PNG diff or TXT diff
• SELECTOR: optional selector for text, otherwise it grabs the whole HTML file

The first time it runs, it'll get a file called baseline in either the img or txt folder. Subsequent runs it'll make a new file called compare in the respective folder, then compare the two files. For an image check, it creates a diff.png file to illustrate the difference.