Noplag vs Proofademic
Noplag
noplag.comProofademic
proofademic.aiSide by side
| Figure | Noplag | Proofademic |
|---|---|---|
| Price from | $9.99/mo | $15/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | Yes |
| Open source | Yes | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 4 | 4 |
| Spec score · AI Plagiarism Checkers | 9.2 (#3) | 7.7 (#17) |
| Audience | The pricing page positions Pro for makers and small teams, Premium for agencies and publishers, and Enterprise for universities and regulated organizations. | Proofademic describes its intended users as educators, students, institutions, publishers, and enterprise teams. |
| Headquarters | San Francisco, United States | 447 Broadway, 2nd Floor, New York, NY 10013 |
| Integrations | The features page lists Canvas, Moodle, Blackboard, and Brightspace integrations via LTI 1.3. | The privacy policy says Proofademic requests Google Docs access to analyze a document the user explicitly selects; the homepage says LMS integrations are planned. |
| Languages | Detection is calibrated at launch for English, Spanish, Portuguese, Polish, and Ukrainian. | Proofademic says it supports review of essays, research papers, articles, and reports in 23 languages. |
| Product | Noplag is an open-source plagiarism checker with a hosted cloud service and an engine released under Apache 2.0. | Proofademic analyzes submitted writing for AI-generated content and plagiarism, with reports that include an overall score and sentence-by-sentence breakdown. |
Plans
Proofademic
- FreeFree
- Essential$15 a month
- Premium$25 a month
- Professional$45 a month
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.
Proofademic
Proofademic analyzes submitted writing for AI-generated content and plagiarism, producing an overall score and sentence-by-sentence breakdown. Its listed checks include AI text, ChatGPT, paraphrase, multilingual and plagiarism detection, as well as Batch Scan. Proofademic says it reviews essays, research papers, articles and reports in 23 languages, with model coverage including ChatGPT, GPT-5, Claude and Gemini. Batch Scan lets teams upload documents, sort results by risk, inspect sentence-level evidence and export reports. Developers and platforms can use the AI Image Detector API; a browser-based image detector for individual users is described as coming soon. Proofademic says submitted text is processed automatically, is not used for model training or resale, and is not reviewed by people. It reports a 0.2% document false-positive rate in an evaluation of 4,200 fully human-authored academic texts, while advising that results support human review. The Free plan is free and includes 1,000 words and a 3-day trial. Paid plans are $15 a month for Essential, $25 a month for Premium and $45 a month for Professional.