Here at Softonic we dispise plagiarism with a passion and are always concerned that inferior download sites will try and copy and paste our software reviews.
So the concept of a program that compares documents to see if cheating has occured is something very appetising. Although AntiPlagiarist won't check against the Web, it's able to distinguish whether copying has been going on between different documents, making it a great tool for teachers who want to check if their students are cheating.
One of the best things about the software is that you can set the number of matching words that AntiPlagiarist will check for, allowing you to be as strict or as liberal as you want.
There are also settings for producing reports on the incidences of copying and pasting that the program finds. On the whole the app runs very quickly and serves its purpose without being overly complicated.