Noplag vs Plagium
Noplag
noplag.comPlagium
plagium.comSide by side
| Figure | Noplag | Plagium |
|---|---|---|
| Price from | $9.99/mo | $19.98/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | Yes | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 4 | 9 |
| Spec score · AI Plagiarism Checkers | 9.2 (#3) | 9.0 (#5) |
| Spec score · Plagiarism Detection Software | 9.1 (#4) | 8.9 (#8) |
| AI detection | AI-content detection is marked as coming soon and is intended to appear as a separate signal. | Plagium provides a separate AI Detector based on statistical and probabilistic analysis of writing patterns. |
| API | The developer API is REST with an OpenAPI spec and webhooks, and is available on paid tiers. | The institutional tier includes API access, and Plagium publishes API v3 and API v2 documentation. |
| 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. | Plagium says it was founded in 2006 and that millions of users check documents and academic articles each year. |
| Documentation | The documentation includes product help, self-hosting guides, corpus setup, fingerprint tuning, API reference, troubleshooting and a changelog. | The knowledge base covers account security, billing, plagiarism reports, AI-detector limitations, API authentication, usage limits, endpoints and webhooks. |
| Founded | 2014 | 2006 |
| Headquarters | San Francisco, United States | New York, USA and France |
| Integrations | The features page lists Canvas, Moodle, Blackboard, and Brightspace integrations via LTI 1.3. | Plagium lists Google Drive integration and a Google Docs Add-on for analyzing documents. |
| Rating on Capterra | 1.0 out of 5 from 1 review | 5.0 out of 5 from 1 review. |
| Reports | Reports link each match to its source and show a similarity score and exact overlapping text, with PDF export. | Reports can include highlighted passages, matched sources, a similarity verdict, PDF export and a read-only share link. |
| Support | Free includes community Discord support, Pro includes email support, and Premium includes priority support with a 12-hour response target. | Published support channels include a help center, email or help-desk support, FAQs/forum and priority email on paid tiers. |
| What it does | Noplag checks submitted text or files for plagiarism and returns similarity scores, highlighted overlaps and source links. | Plagium compares submitted writing with online material to identify possible plagiarism and separately estimates whether text appears machine generated. |
Plans
Plagium
- FreeFree
- Free accountFree
- Single document$2, paid once
- Credit packages$7.95, paid once
- Unlimited$19.98 a month
- Institutional$1,200 a year
- InstitutionsPriced on request
- Monthly planPrice not published
- Prepaid planPrice not published
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.
Plagium
Plagium analyzes text for similarity with other material and offers a separate tool for identifying patterns compatible with AI-generated writing. Its plagiarism service compares submitted text with an online database and reports similarities with links to original sources. The AI Detector uses statistical and probabilistic analysis of writing patterns. Deep Search accepts Microsoft Word, PDF, and native text files; Google Drive integration and a Google Docs add-on support document analysis. Institutional users can access an API, while business solutions can integrate with corporate CRM, ERP, and document-management systems. Plagium presents solutions for educational institutions, publishers, editors, companies, researchers, and compliance teams. The free account costs nothing and allows five daily searches with a 4,000-character limit, but excludes Deep Search and API access. Plagium says submitted content remains owned by the user and is processed for analysis, report generation, and service improvement. Reports are automated estimates rather than definitive proof, and private, unpublished, or non-indexed material may not be detected.