Viper is described as 'is the plagiarism checker of choice! It scans over 10 billion resources, has an easy-to-use interface and highlights areas of plagiarism - totally free!'. There are more than 10 alternatives to Viper for a variety of platforms, including Online / Web-based, Windows, Google Chrome, Google Drive - Docs and SaaS. The best alternative is plagramme, which is free. Other great apps like Viper are Unicheck (Paid), iThenticate (Paid), PlagiarismSearch (Paid) and Oxsic - Oxford plagiarism checker (Paid).
Professional plagiarism checker that reviews over 14 trillion web pages, articles, books, and periodicals to help you detect possible plagiarism in your papers. It finds not only copy paste plagiarism, but paraphrasing, good and bad citations.
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Almost everyone thinks plagramme is a great alternative to Viper.
Professional online plagiarism checker for students, teachers, writers and editors. Advanced plagiarism detection system guarantees most accurate scanning results. The tool accepts all text formats and has additional services of professional rewriting, editing, and proofreading.
Oxford similarity checker (OxSiC) is a professional plagiarism checker designed for bloggers, teams and individuals. This tool has very attractive pricing model charging only 1c per 100 words checked, what makes it the best priced plagiarism checking tool on the market.
Turnitin is an Internet-based plagiarism-detection service created by iParadigms, LLC. It prevents plagiarism by using a proprietary algorithm to compare submitted papers to papers within its own database and several other large academic databases.
Plagius - Plagiarism Detector is a software that analyzes documents on the Internet searching for occurrences of suspected plagiarism. It scans various document format like doc, docx, pdf. Plagius also makes searches and comparisons with local files.