Plag
Plag is a web platform for detecting plagiarism and AI-generated writing.
What Plag is
Plag is a web platform for detecting plagiarism and AI-generated writing. It compares text with internet sources, published materials, and more than 80 million scholarly articles from academic publishers. The checker identifies copy-paste plagiarism, improper references, and paraphrasing, then highlights matched passages with links to sources. It supports 129 languages. An AI detector checks text generated by ChatGPT, Gemini, Llama, and other models. Free checks return one of three similarity ranges: 0–9%, 10–20%, or 21–100%. Verified educators can check up to 20 documents monthly at no cost, while student-shared documents have no stated limit. Plag says uploads are not added to comparison databases or shared with lecturers, schools, or others. Paid plans are Basic at €14.95 a month, Student at €29.95 a month, and PRO Unlimited at €299.95 a month. Additional services include text humanization, revision, editing, and proofreading.
Good
- Supports 129 languages
- Matches internet and academic sources
- AI detection for major models
- Educator allowance for 20 documents monthly
- Reports link to matching sources
Watch out
- Free checks provide ranges, not exact percentages
- Web access only
- PRO Unlimited costs €299.95 a month
Who it suits
Plag suits students, educators, researchers, and organizations checking multilingual documents for plagiarism, source similarity, or AI-generated text.
Verdict
Plag combines multilingual plagiarism checking, academic-source matching, and AI detection in a web service with a free tier. Paid plans add credits and listed analysis features, while educators receive a separate monthly allowance.
Plans and prices
From Plag's own pricing page, checked 9 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Basic | €14.95 a month | 10 000 credits / month · plagiarism, AI detection and cross-language checks: 1 credit per word · basic support · academic articles · in-depth analysis · beta features · priority support · EUR 14.95 / month |
| Student | €29.95 a month | 30 000 credits / month · plagiarism, AI detection and cross-language checks: 1 credit per word · basic support · academic articles · in-depth analysis · beta features · priority support · EUR 29.95 / month |
| PRO Unlimited | €299.95 a month | Unlimited / month · plagiarism, AI detection and cross-language checks: 1 credit per word · academic articles · in-depth analysis · beta features · priority support · EUR 299.95 / month |
The facts
Each one read from Plag's own pages, with the date it was checked.
What it does
- Additional services
- The site lists plagiarism removal, AI text humanization, text formatting, document revision, and editing and proofreading services.checked 9 Oct 2026
- AI detection
- The AI detector checks text generated by ChatGPT, Gemini, Llama, and other AI models.checked 9 Oct 2026
- Data handling
- The privacy policy identifies LINGUA INTELLEGENS, UAB as data controller and says personal data is generally processed and securely stored in the EU/EEA.checked 9 Oct 2026
- Educator allowance
- Verified educator accounts can check up to 20 documents per month at no cost, and there is no limit on documents shared by students.checked 9 Oct 2026
- Languages
- The plagiarism checker supports 129 languages.checked 9 Oct 2026
- Plagiarism types
- The checker identifies copy-paste plagiarism, improper references, and paraphrasing.checked 9 Oct 2026
- Privacy
- The site says uploaded documents are not added to comparative databases or shared with lecturers, schools, or others.checked 9 Oct 2026
- Product
- Plag is an online platform for detecting and preventing plagiarism by comparing text with internet sources and published materials.checked 9 Oct 2026
- Research database
- The site says users can compare documents against over 80 million scholarly articles from academic publishers.checked 9 Oct 2026
- Similarity reports
- Reports highlight matched text and provide links to the matching sources.checked 9 Oct 2026
- Support
- The contact page offers 24/7 chatbot support, while the FAQ says paid clients can access live chat staffed by human agents.checked 9 Oct 2026
The company
- Company history
- Plag says it was established in 2011 and is used in more than 120 countries.checked 9 Oct 2026
- Founded
- 2011checked 28 Sep 2026
- Headquarters
- The privacy policy lists LINGUA INTELLEGENS, UAB at Palangos St. 4-101, Vilnius, Lithuania.checked 9 Oct 2026
Money
- Free checks
- The free check provides a similarity range of 0–9%, 10–20%, or 21–100%.checked 9 Oct 2026
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