Noplag vs PlagiarismSearch
Noplag
noplag.com
PlagiarismSearch
plagiarismsearch.comSide by side
| Figure | Noplag | PlagiarismSearch |
|---|---|---|
| Price from | $9.99/mo | $27.95/mo |
| Free plan | 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 | 7 |
| Spec score · Plagiarism Checkers | 9.2 (#3) | 7.9 (#12) |
| Spec score · AI Plagiarism Checkers | 9.2 (#3) | 7.9 (#11) |
| AI detection | AI-content detection is marked as coming soon and is intended to appear as a separate signal. | The AI writing feature provides probability indicators at text and passage level, with highlighted passages for review. |
| Audience | The pricing page positions Pro for makers and small teams, Premium for agencies and publishers, and Enterprise for universities and regulated organizations. | The maker presents the service for students, educators, writers, bloggers, universities, and organizations. |
| Integrations | The features page lists Canvas, Moodle, Blackboard, and Brightspace integrations via LTI 1.3. | The maker lists a Moodle plugin, Google Docs add-on, customizable API, and Viber and Telegram bots. |
| Privacy | Noplag states that submitted documents are not used to train models or shared between accounts, and EU data residency is available. | The maker says uploaded documents are not stored, while reports may remain in an account and can be permanently deleted by the user. |
| Product | Noplag is an open-source plagiarism checker with a hosted cloud service and an engine released under Apache 2.0. | PlagiarismSearch checks submitted text against selected web, archived, publication, academic, and enabled organizational sources. |
| Reports | Reports link each match to its source and show a similarity score and exact overlapping text, with PDF export. | Reports highlight matching and similar passages, link them to detected sources, and provide a similarity report. |
| Security | Noplag says it encrypts data in transit and at rest and does not yet hold formal attestations such as SOC 2. | The maker says it encrypts user data and evaluates related third parties regularly. |
| Support | Free includes community Discord support, Pro includes email support, and Premium includes priority support with a 12-hour response target. | The maker lists live chat and email support and says its support team is available 24/7 on its Why Us page. |
Plans
PlagiarismSearch
- Light (Basic Package)$9.95, paid once
- Standard (Basic Package)$17.95, paid once
- Light (Monthly Package)$27.95 a month
- Light (3 Months Package)$34.95, paid once
- Premium (Basic Package)$41.95, paid once
- Standard (Monthly Package)$41.95 a month
- Premium (Monthly Package)$65.95 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.
PlagiarismSearch
PlagiarismSearch checks submitted writing against selected web, archived, publication, academic, and enabled organizational sources. Its reports identify matching or similar passages, link those passages to detected sources, and provide a similarity report. An AI writing feature gives probability indicators for the full text and individual passages, highlighting passages for review. The service also lists paper analysis, readability, and spelling and grammar tools. Users can check up to 150 words for free, while registered users can check up to 300 words daily at no charge. The maker says its academic database contains over 500 million indexed texts. Integrations include a Moodle plugin, Google Docs add-on, customizable API, and Viber and Telegram bots. The maker presents it for students, educators, writers, bloggers, universities, and organizations. Paid options include a Light one-time package at $9.95, paid once and monthly packages from $27.95 a month. The maker says uploaded documents are not stored, though reports may remain in an account until deleted by the user.