Another great feature of changedetection.io is that you can interact with websites to compare their content.
Often you need to enter in some search query or need to access a page that's only available from behind a login/password form.
Or maybe perform change detection from behind password protected websites?
Note: Only use this on websites where you have permission todo so, and always "recheck" with the maximum realistic time between rechecks, logging-in every minute could get you blocked from the site you are viewing.