Viper has been discontinued. Similar apps include Curasynth, which has a free version. Other options are Originality.AI, Turnitin, iThenticate and PlagiarismSearch. You're spoiled for choice with Plagiarism Checkers like Viper: we list more than 25 alternatives for the web, Windows, Mac, Android and iPad.
Crossplag™ is the most holistic tool for plagiarism checking dedicated to democratizing plagiarism checking while enabling users to have full ownership and control over their data.
PlagiarismCheck.org helps educators and students all around the world to support academic honesty.
Ukraine
Plagiarisma.Net is a free online plagiarism checker and duplicate content finder. Check your txt,html,rtf,doc,odt,docx,pdf files.
United Kingdom
This plagiarism check uses the best of both worlds. The plagiarism detection software from Ephorus and the enormous scientific database from Turnitin. Custom-made for students.
The Internet makes plagiarism a bigger problem than ever. Now you can turn the tables on them and find the "forgotten" sources! You no longer have to try single sentences in search engines:
Germany
EU
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.
Easy to use! No Downloads! Excellent Plagiarism Detecting Technology. Noplag - Check Your Paper Online and Detect Plagiarism.
PlagControl.com provides a reliable plagiarism detection for students that helps you avoid any type of plagiarism in your papers. Experience the ultimate detection!
AntiPlagiarist checks multiple documents for plagiarism. PDF, Plain text, HTML files, and numerous word-processing formats are supported, including Microsoft Word and Word Perfect.
PlagiCheck is a free Windows application capable of performing extensive searches on the Internet and various databases to check the quality of text by analyzing the percentage of plagiarism, paraphrasing, and similar content.
Canada
Prafero is an all-in-one website intelligence platform for auditing any site in one place. It analyzes SEO, performance, security, DNS, and tech stack signals, then turns them into clear insights so founders, marketers, developers, and agencies can make faster website decisions.
Netherlands
United States
