Noplag vs Plag
Noplag
noplag.com
Plag
plag.ieSide by side
| Figure | Noplag | Plag |
|---|---|---|
| Price from | $9.99/mo | €14.95/mo |
| Free plan | Yes | — |
| Free trial | Yes | — |
| Open source | Yes | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | — |
| Self-hosted | Yes | — |
| Plans published | 4 | 3 |
| Spec score · Plagiarism Checkers | 9.2 (#3) | 7.5 (#22) |
| AI detection | AI-content detection is marked as coming soon and is intended to appear as a separate signal. | The AI detector checks text generated by ChatGPT, Gemini, Llama, and other AI models. |
| Company history | Noplag says it launched in Kyiv in 2014, joined a New York EdTech accelerator in 2018 and raised $200,000 in seed funding. | Plag says it was established in 2011 and is used in more than 120 countries. |
| Founded | 2014 | 2011 |
| Headquarters | San Francisco, United States | The privacy policy lists LINGUA INTELLEGENS, UAB at Palangos St. 4-101, Vilnius, Lithuania. |
| Languages | Detection is calibrated at launch for English, Spanish, Portuguese, Polish, and Ukrainian. | The plagiarism checker supports 129 languages. |
| Privacy | Noplag states that submitted documents are not used to train models or shared between accounts, and EU data residency is available. | The site says uploaded documents are not added to comparative databases or shared with lecturers, schools, or others. |
| Product | Noplag is an open-source plagiarism checker with a hosted cloud service and an engine released under Apache 2.0. | Plag is an online platform for detecting and preventing plagiarism by comparing text with internet sources and published materials. |
| Support | Free includes community Discord support, Pro includes email support, and Premium includes priority support with a 12-hour response target. | The contact page offers 24/7 chatbot support, while the FAQ says paid clients can access live chat staffed by human agents. |
Plans
In their own words
Noplag
Noplag is an open-source plagiarism checker with a hosted cloud service and an engine released under Apache 2.0. Its current matching uses winnowing fingerprints and live-web comparison to find verbatim and near-verbatim copying; it does not detect paraphrase. Sources include the open web, Common Crawl, Wikipedia, academic indexes, the Noplag Database and users’ own folders. Submit DOCX, PDF, TXT, ODT or RTF files, paste text or provide a URL. Reports link matches to their sources, display similarity scores and exact overlapping text, and can be exported as PDFs. Detection is calibrated at launch for English, Spanish, Portuguese, Polish and Ukrainian. AI-content detection is marked as coming soon and intended as a separate signal. The free plan allows three checks per month, up to 2,500 words per check, with community Discord support. Pro costs $9.99 a month and includes 50 monthly checks, up to 25,000 words per check, database and academic-index matching, REST API and webhooks, and email support. A 14-day trial is listed.