Plagiarism Software, That Detects AI-Paraphrasing
Legacy plagiarism checks find copy&paste texts. Mentafy will indicate a source, even if an AI-Tool has paraphrased the full text.
checked submissions
institutions world-wide
Thirty seconds are enough
Free AI paraphrasers are everywhere. Paste in text, rephrase it, submit it – and the classic plagiarism checker finds no match. That is the para-plagiarism problem.
AI-Paraphrasing bypasses two checking tools in one step.
Anyone who runs someone else’s text through what is also called a text spinner, can produce an output that is not reliably detected by either traditional plagiarism checkers or AI detectors. Two detection tools bypassed. One tool. Zero effort.
A systematic review of 189 studies (Frontiers in Computer Science, 2025) reaches a clear conclusion: lexical methods fail precisely when it comes to paraphrased plagiarism. Research on “machine-paraphrased plagiarism” describes this as a “serious threat” to academic integrity.
95%
members of higher education institutions are convinced that AI is being misused at their institution and is weakening the capacity for critical thinking. (AAC&U & Elon University, 2026)
Semantic Source Search - What's behind it
- Semantic Embedding:The text is analysed not as a string of characters, but as a vector of meaning. Synonyms and structural rewordings remain visible.
FOR WHO
Academic integrity at every level
Whether for a single course or an institution-wide quality assurance system, Mentafy adapts to your assessment structure.
Schools and
teachers
Require independently written work – with fair, transparent results that do not prejudge students.
Examination offices and quality assurance
Standardise institution-wide integrity processes, export reports, and ensure audit-ready documentation.
Libraries and
publishers
Check research papers and publication manuscripts for originality before they are submitted or published.
EXPLORE OUR HOLISTIC SOLUTION
Six tools. One Integrity Suite for the AI-Era.
Everything you need to verify authenticity, detect AI use, and document the academic writing process – beyond mere plagiarism checking or AI-detection.
VOICES FROM EDUCATORS
What educators say about Mentafy.
“Mentafy finally gives me a basis on which I can engage in conversation with students without having to judge on suspicion alone.”
Prof. Dr. B. Senokoane
University of South Africa
“The para-plagiarism report revealed a case, where a text spinner made misconduct invisible for our previous checking process entirely.”
Prof. Dr. Müller
University of Cologne
“What convinced me was this: Mentafy doesn’t say ‘AI or not AI’; it gives me multiple data points. That reflects reality.”
Prof. Dr. Johnson
University of Cincinnati
Known from
FAQ
Frequently asked questions about Plagiarism Software
Traditional plagiarism copies text verbatim or almost verbatim. Para-plagiarism occurs when content, arguments, or structures are taken over but completely reworded — so that no wording matches anymore, even though the intellectual work is still not the author’s own.
S³ identifies semantically similar passages and displays the likely source. Whether a citation is present and correctly formatted is checked in parallel by the reference module. By combining both signals, a properly cited paraphrase can be clearly distinguished from para-plagiarism.
No, and we explicitly do not recommend that. S³ provides a signal and a basis for discussion. Sanctions should always be based on the conversation with the student, the full integrity report, and the institution’s established process.
Yes. Mentafy is fully GDPR- and CCPA-compliant. Only the data necessary for the review process is processed. You can find further details in our Privacy Policy.
S³ supports multiple languages. For German, Spanish, and English, we have developed a language-specific model that delivers more reliable results than a generic approach. Additional language upgrades will follow.
S³ and the plagiarism check work exclusively on the final text and do not require any process data. Version analysis is an additional module that provides more context, but it is not a prerequisite for an integrity review.
Mentafy offers straightforward integration with common learning management systems. Contact us for details.
Yes, you can register for Mentafy free of charge and test the para-plagiarism detection directly with your own texts. No credit card, no automatic subscription.
Register for free and see what traditional tools may have missed in your submissions. No credit card. No risk.
