Python tool using diff and curl to check different content on webpages. Note: This doesn't apply SPAs.
I do recommend installing colordiff (apt-get install colordiff).
This tool is only tested in mint and ubuntu.
Usage:
chmod +x check.py
./check.py -i "url|||url"or
python check.py -u "http://www.web.com/|||http://www.web.com/?param=true"or
ln -s /your/folder/urldiff/check.py /usr/local/bin/urldiff
urldiff -u "url|||url"