Viper 4.1

Checks the originality of a selected document
3.7  (25 votes)
4.1.90 (See all)
Compares the text in your documents to what's written in a wide variety of other sources and discovers similarities. The tool includes over 10 billion resources and indicates exactly which areas of your text seem to be plagiarized as well as the document that they're similar to.

Viper is a program that will check your documents for plagiarism, comparing them with millions of others available through the Internet.
It is a necessary tool if you need to submit thesis or papers, which are expected to be 100% free of plagiarism. It is also a great tool for teachers and instructors that must review papers and approve them. This way, they can be sure that the document they are reviewing is not just a "copy & paste job" from a work or works made by other persons, not the submitter.

When you start a search, the program will check the content of your document against a database with more than 10 billion resources. Then, it will highlight the coincidences between your document and those with some similarities. This way, you can compare both documents side by side and introduce in your paper the necessary changes in order to avoid any suspicion of plagiarism.

The program can also check your document for plagiarism against a database of documents already stored in your computer (when available). Once the check is finished, the program will not only show you the results - it will generate a full report that you can save or print.

Daniel Ángel Romero
Editor rating:

Review summary


  • It is free
  • It compares documents against a huge database of similar documents available online


  • None
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